]>
git.sesse.net Git - stockfish/log
Clausable [Mon, 24 Oct 2022 20:00:31 +0000 (16:00 -0400)]
Fix README typos, update AUTHORS
closes https://github.com/official-stockfish/Stockfish/pull/4208
No functional change
dav1312 [Tue, 25 Oct 2022 09:15:00 +0000 (11:15 +0200)]
Add issue template
Add an issue template using GitHub's form schema
https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/syntax-for-githubs-form-schema
closes https://github.com/official-stockfish/Stockfish/pull/4210
No functional change.
Michael Chaly [Fri, 21 Oct 2022 14:10:45 +0000 (17:10 +0300)]
Use TT moves more often in qsearch
During the recapture phase of quiescence search (where we limit the generated moves to recaptures on the last seen capture square),
the move picker will now emit the tt move, even if the tt move is not a recapture.
Passed STC :
https://tests.stockfishchess.org/tests/view/
6350df2928d3a71cb1eef838
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 90280 W: 24001 L: 23845 D: 42434
Ptnml(0-2): 273, 9779, 24941, 9813, 334
Passed LTC :
https://tests.stockfishchess.org/tests/view/
6351308b28d3a71cb1ef06ce
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 104504 W: 27937 L: 27807 D: 48760
Ptnml(0-2): 54, 10378, 31260, 10504, 56
closes https://github.com/official-stockfish/Stockfish/pull/4206
Bench:
4540268
Clement [Fri, 21 Oct 2022 02:29:57 +0000 (02:29 +0000)]
Add RISC-V 64-bit support
adds a riscv64 target architecture to the Makefile to support RISC-V 64-bit.
Compiled and tested on VisionFive 2 board.
closes https://github.com/official-stockfish/Stockfish/pull/4205
No functional change.
disservin [Sun, 16 Oct 2022 12:37:01 +0000 (14:37 +0200)]
enable bit manipulation instruction set 1
bmi1 enables the use of _blsr_u64 for pop_lsb, and is availabe when avx2 is.
verified a small speedup (0.2 - 0.6%)
closes https://github.com/official-stockfish/Stockfish/pull/4202
No functional change
MinetaS [Sun, 16 Oct 2022 15:03:08 +0000 (00:03 +0900)]
Apply -flto-partition=one / -flto=full
This patch fixes a potential bug derived from an incompatibility between LTO and top-level assembly code (INCBIN).
Passed non-regression STC (master
e90341f ):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 119352 W: 31986 L: 31862 D: 55504
Ptnml(0-2): 439, 12624, 33400, 12800, 413
https://tests.stockfishchess.org/tests/view/
634aacf84bc7650f0755188b
closes https://github.com/official-stockfish/Stockfish/pull/4201
No functional change
Rodrigo Roim [Fri, 7 Oct 2022 23:55:07 +0000 (16:55 -0700)]
Fix tablebase probe for dtz >1000 w/o 50 move rule
For qn4N1/6R1/3K4/8/B2k4/8/8/8 w - - 0 1, white loses with DTZ 1034.
See https://syzygy-tables.info/?fen=qn4N1/6R1/3K4/8/B2k4/8/8/8_w_-_-_0_1
Prior to this fix, due to a too small hard-coded value, Stockfish interpreted this as winning.
The new value picked (1<<18) is large enough to deal with the largest DTZ values that can be stored in the current syzygy format.
closes https://github.com/official-stockfish/Stockfish/pull/4187
No functional change.
xoto10 [Sat, 8 Oct 2022 13:53:14 +0000 (14:53 +0100)]
Adjust timeman constants
Adjust timeman constants to use more time in early part of game.
STC @ 10+0.1 th 1 :
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 93984 W: 25177 L: 24787 D: 44020
Ptnml(0-2): 350, 10096, 25729, 10448, 369
https://tests.stockfishchess.org/tests/live_elo/
6339077135f43d649ff6162a
LTC @ 60+0.6 th 1 :
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 329368 W: 88953 L: 88093 D: 152322
Ptnml(0-2): 170, 31457, 100594, 32269, 194
https://tests.stockfishchess.org/tests/live_elo/
6339baed35f43d649ff63142
Sudden death 10+0 :
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 20400 W: 5908 L: 5588 D: 8904
Ptnml(0-2): 177, 2252, 5128, 2360, 283
https://tests.stockfishchess.org/tests/live_elo/
6347c9384bc7650f07549ba7
Sudden death 10+0, no adjudication :
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 17920 W: 4755 L: 4442 D: 8723
Ptnml(0-2): 137, 1985, 4466, 2172, 200
https://tests.stockfishchess.org/tests/live_elo/
634806e84bc7650f0754a639
closes https://github.com/official-stockfish/Stockfish/pull/4188
No functional change
Stéphane Nicolet [Sat, 8 Oct 2022 22:27:26 +0000 (00:27 +0200)]
Tweak the formula for NNUE complexity
Joint work by Ofek Shochat and Stéphane Nicolet.
passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 93288 W: 24996 L: 24601 D: 43691
Ptnml(0-2): 371, 10263, 24989, 10642, 379
https://tests.stockfishchess.org/tests/view/
63448f4f4bc7650f07541987
passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 84168 W: 22771 L: 22377 D: 39020
Ptnml(0-2): 47, 8181, 25234, 8575, 47
https://tests.stockfishchess.org/tests/view/
6345186d4bc7650f07542fbd
================
It seems there are two effects with this patch:
effect A :
If Stockfish is winning at root, we have optimism > 0 for all leaves in
the search tree where Stockfish is to move. There, if (psq - nnue) > 0
(ie if the advantage is more materialistic than positional), then the
product D = optimism * (psq - nnue) will be positive, nnueComplexity will
increase, and the eval will increase from SF point of view.
So the effect A is that if Stockfish is winning at root, she will slightly
favor in the search tree (in other words, search more) the positions where
she can convert her advantage via materialist means.
effect B :
If Stockfish is losing at root, we have optimism > 0 for all leaves in
the search tree where the opponent is to move. There, if (psq - nnue) < 0
(ie if the opponent advantage is more positional than materialistic), then
the product D = optimism * (psq-nnue) will be negative, nnueComplexity will
decrease, and the eval will decrease from the opponent point of view.
So the effect B is that Stockfish will slightly favor in the search tree
(search more) the branches where she can defend by slowly reducing the
opponent positional advantage.
=================
closes https://github.com/official-stockfish/Stockfish/pull/4195
bench:
4673898
Dubslow [Fri, 7 Oct 2022 10:44:29 +0000 (05:44 -0500)]
Remove depth condition from razoring
The eval condition depends on depth anyways, so this patch is nearly (not quite) non-functional
passed STC:
https://tests.stockfishchess.org/tests/view/
63428169fb7ccb2ea9be2629
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 185992 W: 49612 L: 49558 D: 86822
Ptnml(0-2): 618, 19956, 51842, 19914, 666
passed LTC:
https://tests.stockfishchess.org/tests/view/
634418b14bc7650f07540760
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 126816 W: 34147 L: 34043 D: 58626
Ptnml(0-2): 74, 11941, 39281, 12031, 81
closes https://github.com/official-stockfish/Stockfish/pull/4196
bench
4148700
mstembera [Fri, 14 Oct 2022 21:41:08 +0000 (14:41 -0700)]
Optimize make_index() using templates and lookup tables.
https://tests.stockfishchess.org/tests/view/
634517e54bc7650f07542f99
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 642672 W: 171819 L: 170658 D: 300195
Ptnml(0-2): 2278, 68077, 179416, 69336, 2229
this also introduces `-flto-partition=one` as suggested by MinetaS (Syine Mineta)
to avoid linking errors due to LTO on 32 bit mingw. This change was tested in isolation as well
https://tests.stockfishchess.org/tests/view/
634aacf84bc7650f0755188b
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 119352 W: 31986 L: 31862 D: 55504
Ptnml(0-2): 439, 12624, 33400, 12800, 413
closes https://github.com/official-stockfish/Stockfish/pull/4199
No functional change
Stefan Geschwentner [Tue, 4 Oct 2022 16:16:20 +0000 (18:16 +0200)]
Tweak history initialization
Simplify initialization of continuation history by using everywhere the same starting value.
STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 90952 W: 24312 L: 24153 D: 42487
Ptnml(0-2): 356, 10168, 24290, 10285, 377
https://tests.stockfishchess.org/tests/view/
633948f235f43d649ff61fd0
LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 162416 W: 43540 L: 43466 D: 75410
Ptnml(0-2): 77, 16289, 48417, 16333, 92
https://tests.stockfishchess.org/tests/view/
6339ee8a35f43d649ff63986
closes https://github.com/official-stockfish/Stockfish/pull/4186
Bench:
4156027
Giacomo Lorenzetti [Wed, 5 Oct 2022 11:08:00 +0000 (13:08 +0200)]
Remove old line in "Futility pruning for captures"
The line is no longer needed after https://github.com/official-stockfish/Stockfish/commit/
910cf8b21839eb9f1991934a5436eea112021723 .
This patch incidentally applies "Futility Pruning for Captures" also in case of en-passant, changing the bench signature.
Passed STC:
https://tests.stockfishchess.org/tests/view/
6332c1f1208c26088697b731
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 68760 W: 18440 L: 18256 D: 32064
Ptnml(0-2): 267, 7530, 18595, 7728, 260
Passed LTC:
https://tests.stockfishchess.org/tests/view/
633312e9208c26088697c59b
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 455552 W: 121910 L: 122123 D: 211519
Ptnml(0-2): 253, 45439, 136600, 45236, 248
closes https://github.com/official-stockfish/Stockfish/pull/4185
Bench:
4374521
Joost VandeVondele [Wed, 5 Oct 2022 20:59:05 +0000 (22:59 +0200)]
Revert "Mix alpha and statScore for reduction"
This reverts commit
8bab09749dd00951bfa9c5f89f6e35bded76c8a9 .
In this form the patch reduces mate finding effectiveness, as the large alpha value has negative influence on the reductions.
see also https://github.com/official-stockfish/Stockfish/pull/4183
Bench:
4114228
FauziAkram [Mon, 3 Oct 2022 14:45:05 +0000 (17:45 +0300)]
Mix alpha and statScore for reduction
Idea by @xoto10, and tuning by @FauziAkram.
Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 57832 W: 15540 L: 15199 D: 27093
Ptnml(0-2): 207, 6343, 15477, 6680, 209
https://tests.stockfishchess.org/tests/view/
6338db6f35f43d649ff60fdc
passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 50968 W: 13770 L: 13440 D: 23758
Ptnml(0-2): 25, 4905, 15306, 5211, 37
https://tests.stockfishchess.org/tests/view/
6339777035f43d649ff62686
Links to the tuning sessions:
https://tests.stockfishchess.org/tests/view/
63345725a004bed9a2e47b28
https://tests.stockfishchess.org/tests/view/
63345728a004bed9a2e47b2a
closes https://github.com/official-stockfish/Stockfish/pull/4183
Bench:
4426602
disservin [Sun, 18 Sep 2022 09:16:54 +0000 (11:16 +0200)]
Use less reduction for escaping moves
This patch reuses the threatenedPieces variable (which is calculated in movepicker)
to reduce less in the search tree the moves which escape a capture.
passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 314352 W: 84042 L: 83328 D: 146982
Ptnml(0-2): 1105, 35084, 84207, 35552, 1228
https://tests.stockfishchess.org/tests/view/
63355f37a004bed9a2e4a17f
passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 90752 W: 24556 L: 24147 D: 42049
Ptnml(0-2): 59, 8855, 27123, 9296, 43
https://tests.stockfishchess.org/tests/view/
63383a7735f43d649ff5fa8b
closes https://github.com/official-stockfish/Stockfish/pull/4181
bench:
4114228
peregrineshahin [Thu, 22 Sep 2022 05:49:21 +0000 (08:49 +0300)]
Simplify both position calls in useClassical
Simplify the use of classical evaluation when using default settings to only be dependent on piece count and decisive PSQ
passed STC:
https://tests.stockfishchess.org/tests/view/
632d32a7006ef9eb96d86ce9
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 108048 W: 28904 L: 28763 D: 50381
Ptnml(0-2): 383, 12060, 29006, 12183, 392
passed LTC:
https://tests.stockfishchess.org/tests/view/
632d705a006ef9eb96d87649
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 76600 W: 20671 L: 20516 D: 35413
Ptnml(0-2): 34, 7533, 23023, 7664, 46
Inspired by sorais, credit to him.
closes https://github.com/official-stockfish/Stockfish/pull/4177
bench
4173163
Brad Knox [Tue, 20 Sep 2022 21:15:15 +0000 (16:15 -0500)]
Update README.md
Adding some svg icons and additional information, insert links as references
closes https://github.com/official-stockfish/Stockfish/pull/4176
No functional change
Torsten Hellwig [Mon, 19 Sep 2022 16:22:56 +0000 (18:22 +0200)]
Always output hashfull
This removes the restriction that no hashfull information is printed within the first second of a search.
On modern systems, a non-zero value is returned within 6 ms with default settings.
passed STC:
https://tests.stockfishchess.org/tests/view/
63277b08b9c0caa5f4a798e4
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 290096 W: 77505 L: 77561 D: 135030
Ptnml(0-2): 1008, 30713, 81592, 30797, 938
closes https://github.com/official-stockfish/Stockfish/pull/4174
No functional change
mstembera [Sat, 17 Sep 2022 12:45:54 +0000 (05:45 -0700)]
Simplify EVASIONS scoring
remove some multipliers & adjust, doesn't change the move ordering
STC https://tests.stockfishchess.org/tests/view/
6325c1c9b9c0caa5f4a759ae
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 192760 W: 51528 L: 51482 D: 89750
Ptnml(0-2): 642, 20490, 54148, 20380, 720
Credit to locutus2
closes https://github.com/official-stockfish/Stockfish/pull/4171
No functional change
mstembera [Wed, 14 Sep 2022 19:11:52 +0000 (12:11 -0700)]
Prioritize checks in movepicker
give a little bonus for moving pieces to squares where they give check
STC: https://tests.stockfishchess.org/tests/view/
631da742162491686d2e40b5
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 80072 W: 21753 L: 21368 D: 36951
Ptnml(0-2): 421, 8876, 21075, 9225, 439
LTC: https://tests.stockfishchess.org/tests/view/
631dd9e6b85daa436625de1d
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 263480 W: 70916 L: 70158 D: 122406
Ptnml(0-2): 322, 26156, 78029, 26908, 325
similar ideas have been tested by Viz and Guenther
closes https://github.com/official-stockfish/Stockfish/pull/4165
bench:
4326572
atumanian [Mon, 12 Sep 2022 17:16:54 +0000 (20:16 +0300)]
Simplify trend and optimism.
This patch simplifies the formulas used to compute the trend and optimism values before each search iteration.
As a side effect, this removes the parameters which make the relationship between the displayed evaluation value
and the expected game result asymmetric.
I've also provided links to the results of isotonic regression analysis of the relationship between the evaluation and game result (statistical data and a graph) for both tests, which demonstrate that the new version has a more symmetric relationship:
STC: [Data and graph](https://github.com/official-stockfish/Stockfish/discussions/4150#discussioncomment-
3548954 )
LTC: [Data and graph](https://github.com/official-stockfish/Stockfish/discussions/4150#discussioncomment-
3626311 )
See also https://github.com/official-stockfish/Stockfish/issues/4142
passed STC:
https://tests.stockfishchess.org/tests/view/
6313f44b8202a039920e27e6
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 108016 W: 28903 L: 28760 D: 50353
Ptnml(0-2): 461, 12075, 28850, 12104, 518
passed LTC:
https://tests.stockfishchess.org/tests/view/
631de45db85daa436625dfe6
LLR: 3.01 (-2.94,2.94) <-1.75,0.25>
Total: 34792 W: 9412 L: 9209 D: 16171
Ptnml(0-2): 24, 3374, 10397, 3577, 24
Furthermore, this does not measurably impact Elo strength against weaker engines,
as demonstrated in a match of master and patch vs SF13:
This patch vs SF 13:
https://tests.stockfishchess.org/tests/view/
631fa34ae1612778c344c6eb
Elo: 141.66 +-1.2 (95%) LOS: 100.0%
Total: 100000 W: 48182 L: 9528 D: 42290
Ptnml(0-2): 96, 1426, 13277, 30130, 5071
nElo: 284.13 +-3.3 (95%) PairsRatio: 23.13
Master vs SF 13:
https://tests.stockfishchess.org/tests/view/
631fa3ece1612778c344c6ff
Elo: 143.26 +-1.2 (95%) LOS: 100.0%
Total: 100000 W: 48525 L: 9479 D: 41996
Ptnml(0-2): 94, 1537, 13098, 29771, 5500
nElo: 281.70 +-3.3 (95%) PairsRatio: 21.63
closes: https://github.com/official-stockfish/Stockfish/pull/4163
Bench:
4425574
Joost VandeVondele [Sun, 11 Sep 2022 19:28:12 +0000 (21:28 +0200)]
Explicitly annotate a few variables
as [[maybe_unused]], avoiding the (void)foo trick.
closes https://github.com/official-stockfish/Stockfish/pull/4162
No functional change
mstembera [Tue, 6 Sep 2022 22:02:35 +0000 (15:02 -0700)]
Optimize AVX2 path in NNUE evaluation
always selecting AffineTransform specialization for small inputs.
A related patch was tested as
Initially tested as a simplification
STC https://tests.stockfishchess.org/tests/view/
6317c3f437f41b13973d6dff
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 58072 W: 15619 L: 15425 D: 27028
Ptnml(0-2): 241, 6191, 15992, 6357, 255
Elo gain speedup test
STC https://tests.stockfishchess.org/tests/view/
63181c1b37f41b13973d79dc
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 184496 W: 49922 L: 49401 D: 85173
Ptnml(0-2): 851, 19397, 51208, 19964, 828
and this patch gained in testing
speedup = +0.0071
P(speedup > 0) = 1.0000
on CPU: 16 x AMD Ryzen 9 3950X
closes https://github.com/official-stockfish/Stockfish/pull/4158
No functional change
Michael Chaly [Sat, 10 Sep 2022 09:30:25 +0000 (12:30 +0300)]
Do less singular extensions for former PVnode
Patch is a reintroduction of logic what was simplified a while ago
in a slightly different form. Do bigger extension offset in
case of non-pv node having a pv.
passed STC
https://tests.stockfishchess.org/tests/view/
631977c048f27688a06e66d5
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 23296 W: 6404 L: 6108 D: 10784
Ptnml(0-2): 88, 2539, 6118, 2795, 108
passed LTC
https://tests.stockfishchess.org/tests/view/
631989cb48f27688a06e696c
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 235592 W: 63890 L: 63188 D: 108514
Ptnml(0-2): 275, 23392, 69804, 24006, 319
closes https://github.com/official-stockfish/Stockfish/pull/4159
Bench:
3993611
Dubslow [Sat, 20 Aug 2022 03:49:29 +0000 (22:49 -0500)]
Razor also on PV nodes
Simplification introduced by xoto10
blue LTC vs new master:
https://tests.stockfishchess.org/tests/view/
631ad4ef9cfa5e9b648d1b4e
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 59184 W: 16002 L: 15828 D: 27354
Ptnml(0-2): 65, 5777, 17747, 5925, 78
blue STC vs old master:
https://tests.stockfishchess.org/tests/view/
6306b87b902a848543334c25
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 213944 W: 57184 L: 57159 D: 99601
Ptnml(0-2): 877, 23448, 58331, 23405, 911
blue LTC vs old master:
https://tests.stockfishchess.org/tests/view/
63070e6b902a8485433357e7
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 192080 W: 52050 L: 52006 D: 88024
Ptnml(0-2): 232, 18981, 57611, 18943, 273
closes https://github.com/official-stockfish/Stockfish/pull/4147
bench
4208975
Michael Chaly [Sat, 10 Sep 2022 22:45:37 +0000 (01:45 +0300)]
Further LTC tuning of search parameters
Tuning done by bigpenor with some hand adjustments on top by Viz.
Had a good performance at fixed games 180+1.8:
https://tests.stockfishchess.org/tests/view/
631836b437f41b13973d7da1
Elo: 1.35 +-1.2 (95%) LOS: 98.6%
Total: 60000 W: 16422 L: 16189 D: 27389
Ptnml(0-2): 39, 5335, 18992, 5622, 12
nElo: 3.13 +-2.8 (95%) PairsRatio: 1.05
Passed 60+0.6 8 threads SPRT:
https://tests.stockfishchess.org/tests/view/
631ba0ff74bc4fe483a99db3
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 29712 W: 8301 L: 8039 D: 13372
Ptnml(0-2): 12, 2318, 9925, 2598, 3
closes https://github.com/official-stockfish/Stockfish/pull/4160
bench
3938073
FauziAkram [Wed, 31 Aug 2022 11:45:39 +0000 (14:45 +0300)]
VLTC tuning
Tuning some parameters that scale well with longer time control:
Failed STC:
https://tests.stockfishchess.org/tests/view/
6313424d8202a039920e130a
LLR: -2.94 (-2.94,2.94) <-1.75,0.25>
Total: 42680 W: 11231 L: 11540 D: 19909
Ptnml(0-2): 191, 5008, 11232, 4737, 172
Passed LTC:
https://tests.stockfishchess.org/tests/view/
6311e2cd874169ca52ae7933
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 53448 W: 14782 L: 14437 D: 24229
Ptnml(0-2): 101, 5214, 15740, 5577, 92
Passed VLTC:
https://tests.stockfishchess.org/tests/view/
6312530cfa99a92e3002c927
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 123336 W: 33465 L: 33007 D: 56864
Ptnml(0-2): 38, 11466, 38204, 11920, 40
closes https://github.com/official-stockfish/Stockfish/pull/4154
Bench:
5609606
Joost VandeVondele [Sat, 3 Sep 2022 09:03:09 +0000 (11:03 +0200)]
Provide network download fallback
in case the base infrastructure for providing the networks
https://tests.stockfishchess.org/nns
is down, use an alternate github repo for downloading networks during the build.
fixes #4149
fixes #4140
closes https://github.com/official-stockfish/Stockfish/pull/4151
No functional change
Joost VandeVondele [Sat, 3 Sep 2022 09:15:40 +0000 (11:15 +0200)]
Increase the maximum number of threads to 1024
relatively soon servers with 512 threads will be available 'quite commonly',
anticipate even more threads, and increase our current maximum from 512 to 1024.
closes https://github.com/official-stockfish/Stockfish/pull/4152
No functional change.
dav1312 [Fri, 26 Aug 2022 09:26:31 +0000 (11:26 +0200)]
Disable ARM CI tests
Temporarily disable ARM CI tests until a mitigation is implemented
closes https://github.com/official-stockfish/Stockfish/pull/4148
No functional change.
mstembera [Sun, 14 Aug 2022 00:01:11 +0000 (17:01 -0700)]
Make key_after() more consistent with key()
STC: https://tests.stockfishchess.org/tests/view/
62f8547123d42b50a8dac674
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 176640 W: 47699 L: 47189 D: 81752
Ptnml(0-2): 776, 18599, 49129, 18971, 845
A bug fix plus non functional speed optimization. Position::key_after(Move m) is now
consistent with Position::key() thus prefetching correct TT entries which speeds things up.
Related PR #3759
closes https://github.com/official-stockfish/Stockfish/pull/4130
No functional change
Joost VandeVondele [Fri, 12 Aug 2022 10:31:49 +0000 (12:31 +0200)]
Simplify the use of classical eval
no benefit of the fallback term (exercised rarely).
Cleanup the associated code.
passed STC
https://tests.stockfishchess.org/tests/view/
62f62c2b6f0a08af9f776367
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 67832 W: 18334 L: 18148 D: 31350
Ptnml(0-2): 369, 7171, 18609, 7439, 328
passed LTC
https://tests.stockfishchess.org/tests/view/
62f68beb6f0a08af9f77710e
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 104664 W: 28363 L: 28233 D: 48068
Ptnml(0-2): 169, 10162, 31511, 10350, 140
closes https://github.com/official-stockfish/Stockfish/pull/4132
Bench:
6079565
Michael Chaly [Mon, 15 Aug 2022 05:52:55 +0000 (08:52 +0300)]
Simplify away smp adjustment in TT use
Passed STC
https://tests.stockfishchess.org/tests/view/
62f7d81f23d42b50a8dab568
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 98160 W: 26307 L: 26165 D: 45688
Ptnml(0-2): 201, 10282, 27960, 10448, 189
Passed LTC
https://tests.stockfishchess.org/tests/view/
62f8d1a623d42b50a8dad4fb
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 81544 W: 22346 L: 22200 D: 36998
Ptnml(0-2): 44, 7542, 25446, 7704, 36
closes https://github.com/official-stockfish/Stockfish/pull/4131
No functional change (single threaded).
mckx00 [Sat, 13 Aug 2022 12:32:30 +0000 (05:32 -0700)]
Make LMR code easier to follow
Remove flags doFullDepthSearch and didLMR, and reorder instruction.
Small measured speedup.
Closes https://github.com/official-stockfish/Stockfish/pull/4129
No functional change.
mstembera [Tue, 9 Aug 2022 04:33:59 +0000 (21:33 -0700)]
Report longest PV lines for multithreaded search
In case several threads find the same bestmove,
report the longest PV line found.
closes https://github.com/official-stockfish/Stockfish/pull/4126
No functional change.
Joost VandeVondele [Sun, 31 Jul 2022 14:55:07 +0000 (16:55 +0200)]
Remove an unneeded randomization of evals.
most of the effect comes from the randomization of 3-folds.
passed STC:
https://tests.stockfishchess.org/tests/view/
62e697e97e84186e5d19af6f
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 572976 W: 153168 L: 153539 D: 266269
Ptnml(0-2): 2505, 64783, 152364, 64250, 2586
passed LTC:
https://tests.stockfishchess.org/tests/view/
62ee5977523c86dcd6957154
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 704808 W: 191212 L: 191680 D: 321916
Ptnml(0-2): 1340, 70579, 208972, 70235, 1278
closes https://github.com/official-stockfish/Stockfish/pull/4128
Bench:
5868987
Stefan Geschwentner [Tue, 9 Aug 2022 18:56:13 +0000 (20:56 +0200)]
Cleanup code
This PR includes following cleanups:
- Remove the unused depth variable in the thread class.
- cleanup ValueList (added from mstembera)
closes https://github.com/official-stockfish/Stockfish/pull/4127
No functional change.
Joost VandeVondele [Sun, 31 Jul 2022 12:58:13 +0000 (14:58 +0200)]
Update WDL model for current SF
This updates the WDL model based on the LTC statistics for the two weeks (3M games).
for old results see:
https://github.com/official-stockfish/Stockfish/pull/3981
https://github.com/official-stockfish/Stockfish/pull/3582
https://github.com/official-stockfish/Stockfish/pull/2778
closes https://github.com/official-stockfish/Stockfish/pull/4115
No functional change.
Joost VandeVondele [Sun, 31 Jul 2022 13:04:23 +0000 (15:04 +0200)]
Update CPU contributors list
Thanks for your contributions!
closes https://github.com/official-stockfish/Stockfish/pull/4116
No functional change
lonfom169 [Wed, 3 Aug 2022 15:43:21 +0000 (12:43 -0300)]
Reintroduce singularQuietLMR
STC:
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 88912 W: 23972 L: 23580 D: 41360
Ptnml(0-2): 365, 9820, 23712, 10176, 383
https://tests.stockfishchess.org/tests/view/
62e9537a400addce2c13399b
LTC:
LLR: 2.97 (-2.94,2.94) <0.50,2.50>
Total: 85672 W: 23607 L: 23192 D: 38873
Ptnml(0-2): 219, 8316, 25365, 8703, 233
https://tests.stockfishchess.org/tests/view/
62e9a174400addce2c1346e4
closes https://github.com/official-stockfish/Stockfish/pull/4122
Bench:
5921315
Stefan Geschwentner [Tue, 2 Aug 2022 21:14:14 +0000 (23:14 +0200)]
Tweak history updates
In general the history update bonus is slightly decreased by 11% which gives a slower saturation speed.
In addition only for main history the divisor is halfed (used history values are doubled to maintain same maximum)
which have an effect in the opposite direction on saturation speed.
STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 157088 W: 42673 L: 42168 D: 72247
Ptnml(0-2): 857, 17346, 41642, 17833, 866
https://tests.stockfishchess.org/tests/view/
62e5517ab383a712b13867c5
LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 325592 W: 88705 L: 87753 D: 149134
Ptnml(0-2): 594, 32288, 96076, 33248, 590
https://tests.stockfishchess.org/tests/view/
62e5e4f4b383a712b1387d53
closes https://github.com/official-stockfish/Stockfish/pull/4119
Bench:
5518728
Michael Chaly [Sat, 30 Jul 2022 23:04:23 +0000 (02:04 +0300)]
Do more TT cutoffs in case of exact bound
The idea is that these TT entries are considered move valuable in TT replacement scheme - they are always overwriting other entries. So it makes sence for them to produce more aggressive cutoffs.
passed STC
https://tests.stockfishchess.org/tests/view/
62e4d407b383a712b1385410
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 96632 W: 26045 L: 25659 D: 44928
Ptnml(0-2): 434, 10635, 25770, 11065, 412
passed LTC
https://tests.stockfishchess.org/tests/view/
62e523e2b383a712b1386193
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 77960 W: 21363 L: 20989 D: 35608
Ptnml(0-2): 190, 7591, 23009, 8035, 155
closes https://github.com/official-stockfish/Stockfish/pull/4114
bench
5820568
Dubslow [Wed, 27 Jul 2022 04:45:19 +0000 (23:45 -0500)]
remove useClassical depth condition
passed STC:
https://tests.stockfishchess.org/tests/view/
62e0c3e98e4fa6ae472695ed
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 293568 W: 78934 L: 79151 D: 135483
Ptnml(0-2): 1344, 31488, 81366, 31213, 1373
passed LTC:
https://tests.stockfishchess.org/tests/view/
62e190aa8e4fa6ae4726b5b5
LLR: 2.98 (-2.94,2.94) <-2.25,0.25>
Total: 187392 W: 50971 L: 51028 D: 85393
Ptnml(0-2): 384, 17801, 57369, 17772, 370
other attempts to otherwise tune this parameter failed, bounds 6,7,10,11 failed STC, 8 passed STC but failed LTC
closes https://github.com/official-stockfish/Stockfish/pull/4112
bench
5796377
Dubslow [Tue, 19 Jul 2022 06:09:30 +0000 (01:09 -0500)]
Simplify reduction condition for cutNodes
LMR: for cutNodes, dont exclude killer moves. This was a prelude to reducing
allNodes, altho that's failed so far.
STC https://tests.stockfishchess.org/tests/view/
62d64ad147ae1768b34a27c3
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 37064 W: 10044 L: 9889 D: 17131
Ptnml(0-2): 162, 4115, 9828, 4260, 167
LTC https://tests.stockfishchess.org/tests/view/
62d66cc047ae1768b34a2b14
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 39832 W: 10796 L: 10659 D: 18377
Ptnml(0-2): 69, 3969, 11706, 4100, 72
closes https://github.com/official-stockfish/Stockfish/pull/4109
bench:
5697891
Joost VandeVondele [Mon, 11 Jul 2022 15:32:39 +0000 (17:32 +0200)]
Update default net to nn-
ad9b42354671 .nnue
using trainer branch https://github.com/glinscott/nnue-pytorch/pull/208 with a slightly
tweaked loss function (power 2.5 instead of 2.6), otherwise same training as in
the previous net update https://github.com/official-stockfish/Stockfish/pull/4100
passed STC:
LLR: 2.97 (-2.94,2.94) <0.00,2.50>
Total: 367536 W: 99465 L: 98573 D: 169498
Ptnml(0-2): 1820, 40994, 97117, 42148, 1689
https://tests.stockfishchess.org/tests/view/
62cc43fe50dcbecf5fc1c5b8
passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 25032 W: 6802 L: 6553 D: 11677
Ptnml(0-2): 40, 2424, 7341, 2669, 42
https://tests.stockfishchess.org/tests/view/
62ce5f421dacb46e4d5fd277
closes https://github.com/official-stockfish/Stockfish/pull/4107
Bench:
5905619
Michael Chaly [Wed, 13 Jul 2022 08:59:54 +0000 (11:59 +0300)]
Simplify away some unneeded code in time management
The lower bound of the clamp is never used since complexity can't be negative and thus is unneeded.
closes https://github.com/official-stockfish/Stockfish/pull/4105
No functional change
Joost VandeVondele [Sat, 2 Jul 2022 06:55:05 +0000 (08:55 +0200)]
Limit the researching at same depth.
If the elapsed time is close to the available time, the time management thread can signal that the next iterations should be searched at the same depth (Threads.increaseDepth = false). While the rootDepth increases, the adjustedDepth is kept constant with the searchAgainCounter.
In exceptional cases, when threading is used and the master thread, which controls the time management, signals to not increaseDepth, but by itself takes a long time to finish the iteration, the helper threads can search repeatedly at the same depth. This search finishes more and more quickly, leading to helper threads that report a rootDepth of MAX_DEPTH (245). The latter is not optimal as it is confusing for the user, stops search on these threads, and leads to an incorrect bias in the thread voting scheme. Probably with only a small impact on strength.
This behavior was observed almost two years ago,
see https://github.com/official-stockfish/Stockfish/issues/2717
This patch fixes #2717 by ensuring the effective depth increases at once every four iterations,
even in increaseDepth is false.
Depth 245 searches (for non-trivial positions) were indeed absent with this patch,
but frequent with master in the tests below:
https://discord.com/channels/
435943710472011776 /
813919248455827515 /
994872720800088095
Total pgns: 2173
Base: 2867
Patch: 0
it passed non-regression testing in various setups:
SMP STC:
https://tests.stockfishchess.org/tests/view/
62bfecc96178ffe6394ba036
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 37288 W: 10171 L: 10029 D: 17088
Ptnml(0-2): 75, 3777, 10793, 3929, 70
SMP LTC:
https://tests.stockfishchess.org/tests/view/
62c08f6f49b62510394be066
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 190568 W: 52125 L: 52186 D: 86257
Ptnml(0-2): 70, 17854, 59504, 17779, 77
LTC:
https://tests.stockfishchess.org/tests/view/
62c08b6049b62510394bdfb6
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 48120 W: 13204 L: 13083 D: 21833
Ptnml(0-2): 54, 4458, 14919, 4571, 58
Special thanks to miguel-I, Disservin, ruicoelhopedro and others for analysing the problem,
the data, and coming up with the key insight, needed to fix this longstanding issue.
closes https://github.com/official-stockfish/Stockfish/pull/4104
Bench:
5182295
Dubslow [Fri, 1 Jul 2022 16:53:16 +0000 (11:53 -0500)]
Time mgmt fix division.
oversight changed the corresponding float division to integer division in a previous tune https://github.com/official-stockfish/Stockfish/commit/
442c40b43de8ede1e424efa674c8d45322e3b43c it is stronger to keep the original float division.
green LTC: https://tests.stockfishchess.org/tests/view/
62bf34bc0340fb1e0cc934e7
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 38952 W: 10738 L: 10467 D: 17747
Ptnml(0-2): 46, 3576, 11968, 3833, 53
yellow STC: https://tests.stockfishchess.org/tests/view/
62bff6506178ffe6394ba1d1
LLR: -2.95 (-2.94,2.94) <0.00,2.50>
Total: 226960 W: 61265 L: 61062 D: 104633
Ptnml(0-2): 938, 24398, 62582, 24647, 915
further slightly tweaked tests confirm this Elo gain.
closes https://github.com/official-stockfish/Stockfish/pull/4097
No functional change
Michael Chaly [Tue, 5 Jul 2022 11:15:34 +0000 (14:15 +0300)]
Simplify away FRC correction term
Since new net is trained partially using FRC data this part of adjustment that penalises bishops that are locked in the corner is no longer needed - net should "know" this things itself much better.
STC on FRC book :
https://tests.stockfishchess.org/tests/view/
62c3031b9e7d9997a12d852f
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 22048 W: 3003 L: 2845 D: 16200
Ptnml(0-2): 96, 1778, 7149, 1874, 127
LTC on FRC book :
https://tests.stockfishchess.org/tests/view/
62c32e939e7d9997a12d8c5e
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 36784 W: 3138 L: 3037 D: 30609
Ptnml(0-2): 36, 1842, 14537, 1939, 38
STC on DFRC book :
https://tests.stockfishchess.org/tests/view/
62c32efb9e7d9997a12d8c6f
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 20424 W: 3903 L: 3721 D: 12800
Ptnml(0-2): 172, 1984, 5724, 2154, 178
LTC on DFRC book :
https://tests.stockfishchess.org/tests/view/
62c358c79e7d9997a12d9319
LLR: 2.93 (-2.94,2.94) <-2.25,0.25>
Total: 53784 W: 7581 L: 7480 D: 38723
Ptnml(0-2): 87, 3887, 18856, 3962, 100
closes https://github.com/official-stockfish/Stockfish/pull/4101
bench
5182295
Joost VandeVondele [Fri, 1 Jul 2022 13:07:49 +0000 (15:07 +0200)]
Update default net to nn-
3c0054ea9860 .nnu
First things first...
this PR is being made from court. Today, Tord and Stéphane, with broad support
of the developer community are defending their complaint, filed in Munich, against ChessBase.
With their products Houdini 6 and Fat Fritz 2, both Stockfish derivatives,
ChessBase violated repeatedly the Stockfish GPLv3 license. Tord and Stéphane have terminated
their license with ChessBase permanently. Today we have the opportunity to present
our evidence to the judge and enforce that termination. To read up, have a look at our blog post
https://stockfishchess.org/blog/2022/public-court-hearing-soon/ and
https://stockfishchess.org/blog/2021/our-lawsuit-against-chessbase/
This PR introduces a net trained with an enhanced data set and a modified loss function in the trainer.
A slight adjustment for the scaling was needed to get a pass on standard chess.
passed STC:
https://tests.stockfishchess.org/tests/view/
62c0527a49b62510394bd610
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 135008 W: 36614 L: 36152 D: 62242
Ptnml(0-2): 640, 15184, 35407, 15620, 653
passed LTC:
https://tests.stockfishchess.org/tests/view/
62c17e459e7d9997a12d458e
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 28864 W: 8007 L: 7749 D: 13108
Ptnml(0-2): 47, 2810, 8466, 3056, 53
Local testing at a fixed 25k nodes resulted in
Test run1026/easy_train_data/experiments/experiment_2/training/run_0/nn-epoch799.nnue
localElo: 4.2 +- 1.6
The real strength of the net is in FRC and DFRC chess where it gains significantly.
Tested at STC with slightly different scaling:
FRC:
https://tests.stockfishchess.org/tests/view/
62c13a4002ba5d0a774d20d4
Elo: 29.78 +-3.4 (95%) LOS: 100.0%
Total: 10000 W: 2007 L: 1152 D: 6841
Ptnml(0-2): 31, 686, 2804, 1355, 124
nElo: 59.24 +-6.9 (95%) PairsRatio: 2.06
DFRC:
https://tests.stockfishchess.org/tests/view/
62c13a5702ba5d0a774d20d9
Elo: 55.25 +-3.9 (95%) LOS: 100.0%
Total: 10000 W: 2984 L: 1407 D: 5609
Ptnml(0-2): 51, 636, 2266, 1779, 268
nElo: 96.95 +-7.2 (95%) PairsRatio: 2.98
Tested at LTC with identical scaling:
FRC:
https://tests.stockfishchess.org/tests/view/
62c26a3c9e7d9997a12d6caf
Elo: 16.20 +-2.5 (95%) LOS: 100.0%
Total: 10000 W: 1192 L: 726 D: 8082
Ptnml(0-2): 10, 403, 3727, 831, 29
nElo: 44.12 +-6.7 (95%) PairsRatio: 2.08
DFRC:
https://tests.stockfishchess.org/tests/view/
62c26a539e7d9997a12d6cb2
Elo: 40.94 +-3.0 (95%) LOS: 100.0%
Total: 10000 W: 2215 L: 1042 D: 6743
Ptnml(0-2): 10, 410, 3053, 1451, 76
nElo: 92.77 +-6.9 (95%) PairsRatio: 3.64
This is due to the mixing in a significant fraction of DFRC training data in the final training round. The net is
trained using the easy_train.py script in the following way:
```
python easy_train.py \
--training-dataset=../Leela-dfrc_n5000.binpack \
--experiment-name=2 \
--nnue-pytorch-branch=vondele/nnue-pytorch/lossScan4 \
--additional-training-arg=--param-index=2 \
--start-lambda=1.0 \
--end-lambda=0.75 \
--gamma=0.995 \
--lr=4.375e-4 \
--start-from-engine-test-net True \
--tui=False \
--seed=$RANDOM \
--max_epoch=800 \
--auto-exit-timeout-on-training-finished=900 \
--network-testing-threads 8 \
--num-workers 12
```
where the data set used (Leela-dfrc_n5000.binpack) is a combination of our previous best data set (mix of Leela and some SF data) and DFRC data, interleaved to form:
The data is available in https://drive.google.com/drive/folders/1S9-ZiQa_3ApmjBtl2e8SyHxj4zG4V8gG?usp=sharing
Leela mix: https://drive.google.com/file/d/1JUkMhHSfgIYCjfDNKZUMYZt6L5I7Ra6G/view?usp=sharing
DFRC: https://drive.google.com/file/d/17vDaff9LAsVo_1OfsgWAIYqJtqR8aHlm/view?usp=sharing
The training branch used is
https://github.com/vondele/nnue-pytorch/commits/lossScan4
A PR to the main trainer repo will be made later. This contains a revised loss function, now computing the loss from the score based on the win rate model, which is a more accurate representation than what we had before. Scaling constants are tweaked there as well.
closes https://github.com/official-stockfish/Stockfish/pull/4100
Bench:
5186781
Dubslow [Fri, 10 Jun 2022 13:11:02 +0000 (08:11 -0500)]
Use NNUE complexity in search, retune related parameters
This builds on ideas of xoto10 and mstembera to use more output from NNUE in the search algorithm.
passed STC:
https://tests.stockfishchess.org/tests/view/
62ae454fe7ee5525ef88a957
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 89208 W: 24127 L: 23753 D: 41328
Ptnml(0-2): 400, 9886, 23642, 10292, 384
passed LTC:
https://tests.stockfishchess.org/tests/view/
62acc6ddd89eb6cf1e0750a1
LLR: 2.93 (-2.94,2.94) <0.50,3.00>
Total: 56352 W: 15430 L: 15115 D: 25807
Ptnml(0-2): 44, 5501, 16782, 5794, 55
closes https://github.com/official-stockfish/Stockfish/pull/4088
bench
5332964
Dubslow [Wed, 15 Jun 2022 22:30:32 +0000 (17:30 -0500)]
LMR: remove `deeper`
...apparently it wasn't doing much anymore. inspired by rufish's recent attempts to improve this.
passed STC:
https://tests.stockfishchess.org/tests/view/
62abca2cd89eb6cf1e072c04
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 85576 W: 22766 L: 22683 D: 40127
Ptnml(0-2): 362, 9607, 22741, 9742, 336
passed LTC:
https://tests.stockfishchess.org/tests/view/
62ac90ffd89eb6cf1e07488f
LLR: 2.93 (-2.94,2.94) <-2.25,0.25>
Total: 48248 W: 13018 L: 12896 D: 22334
Ptnml(0-2): 32, 4773, 14400, 4879, 40
closes https://github.com/official-stockfish/Stockfish/pull/4088
bench
5578988
bmc4 [Thu, 16 Jun 2022 10:19:39 +0000 (07:19 -0300)]
Don't change ttPv at probCut
STC:
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 35672 W: 9618 L: 9462 D: 16592
Ptnml(0-2): 151, 3890, 9601, 4040, 154
https://tests.stockfishchess.org/tests/view/
62ab03f750949cfc241b1965
LTC:
LLR: 2.93 (-2.94,2.94) <-2.25,0.25>
Total: 54160 W: 14626 L: 14511 D: 25023
Ptnml(0-2): 42, 5414, 16056, 5523, 45
https://tests.stockfishchess.org/tests/view/
62ab5e6fd89eb6cf1e071b87
closes https://github.com/official-stockfish/Stockfish/pull/4088
bench:
5798229
bmc4 [Thu, 9 Jun 2022 13:37:24 +0000 (10:37 -0300)]
Simplify away condition in ttSave in probCut
Remove condition for tte->save in probCut so it always saves on probCut cutoff.
STC:
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 47848 W: 12921 L: 12782 D: 22145
Ptnml(0-2): 207, 5340, 12715, 5431, 231
https://tests.stockfishchess.org/tests/view/
62a1f7c87bd8e641e44436f7
LTC:
LLR: 2.97 (-2.94,2.94) <-2.25,0.25>
Total: 132736 W: 35895 L: 35881 D: 60960
Ptnml(0-2): 109, 13384, 39360, 13414, 101
https://tests.stockfishchess.org/tests/view/
62a2421a7bd8e641e444434f
closes https://github.com/official-stockfish/Stockfish/pull/4069
bench:
5845802
mstembera [Mon, 6 Jun 2022 02:32:05 +0000 (19:32 -0700)]
Minor simplifications and cleanup in search
STC: https://tests.stockfishchess.org/tests/view/
629d6775593a4a9b6482c1ec
LLR: 2.93 (-2.94,2.94) <-2.25,0.25>
Total: 77416 W: 20683 L: 20589 D: 36144
Ptnml(0-2): 317, 8690, 20620, 8744, 337
LTC: https://tests.stockfishchess.org/tests/view/
629db4be593a4a9b6482ceef
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 106544 W: 28752 L: 28705 D: 49087
Ptnml(0-2): 97, 10692, 31641, 10751, 91
closes https://github.com/official-stockfish/Stockfish/pull/4059
Bench:
5913510
ppigazzini [Mon, 13 Jun 2022 20:08:01 +0000 (22:08 +0200)]
Restore NDKv21 for GitHub Actions
GitHub updated the versions of NDK installed on the Actions runners
breaking the ARM tests.
Restore the NDKv21 using the GitHub suggested mitigation, see:
https://github.com/actions/virtual-environments/issues/5595
closes https://github.com/official-stockfish/Stockfish/pull/4077
No functional change
candirufish [Tue, 7 Jun 2022 05:21:43 +0000 (07:21 +0200)]
Use qsearch on step 11 if depth is equal to or below 0
larger reduction of depth if no TT entry is found, and go in qsearch as needed.
stc:
https://tests.stockfishchess.org/tests/view/
629dfacd593a4a9b6482db72
LLR: 2.93 (-2.94,2.94) <0.00,2.50>
Total: 31920 W: 8591 L: 8322 D: 15007
Ptnml(0-2): 127, 3551, 8376, 3738, 168
ltc:
https://tests.stockfishchess.org/tests/view/
629e304e593a4a9b6482e451
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 17488 W: 4842 L: 4614 D: 8032
Ptnml(0-2): 13, 1670, 5151, 1896, 14
closes https://github.com/official-stockfish/Stockfish/pull/4056
Bench:
5870283
Boštjan Mejak [Tue, 31 May 2022 18:25:57 +0000 (20:25 +0200)]
Wording of help output and comments.
Improved the output text that is diplayed when executing the 'help' command.
Also, some comments were fixed along the way.
closes https://github.com/official-stockfish/Stockfish/pull/4048
closes https://github.com/official-stockfish/Stockfish/pull/4044
No functional change
Dubslow [Mon, 30 May 2022 00:52:11 +0000 (19:52 -0500)]
Remove LMR condition for complex pos
Inspired by Kia's similar test: https://tests.stockfishchess.org/tests/view/
6292898c1e7cd5f29966fbe0
Passed STC:
https://tests.stockfishchess.org/tests/view/
62941588b0d5a7d1b780ed4b
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 266872 W: 70850 L: 71033 D: 124989
Ptnml(0-2): 1180, 30114, 70941, 30111, 1090
Passed LTC:
https://tests.stockfishchess.org/tests/view/
62964a754628d33daa24f062
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 70160 W: 18756 L: 18662 D: 32742
Ptnml(0-2): 42, 6976, 20950, 7070, 42
closes https://github.com/official-stockfish/Stockfish/pull/4047
Bench
6237567
xoto10 [Wed, 1 Jun 2022 00:20:27 +0000 (01:20 +0100)]
Blend nnue complexity with classical.
Following mstembera's test of the complexity value derived from nnue values,
this change blends that idea with the old complexity calculation.
STC 10+0.1:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 42320 W: 11436 L: 11148 D: 19736
Ptnml(0-2): 209, 4585, 11263, 4915, 188
https://tests.stockfishchess.org/tests/live_elo/
6295c9239c8c2fcb2bad7fd9
LTC 60+0.6:
LLR: 2.98 (-2.94,2.94) <0.50,3.00>
Total: 34600 W: 9393 L: 9125 D: 16082
Ptnml(0-2): 32, 3323, 10319, 3597, 29
https://tests.stockfishchess.org/tests/view/
6295fd5d9c8c2fcb2bad88cf
closes https://github.com/official-stockfish/Stockfish/pull/4046
Bench
6078140
candirufish [Tue, 31 May 2022 19:52:04 +0000 (21:52 +0200)]
cutnode and movecount lmr extension simplification
Passed STC
https://tests.stockfishchess.org/tests/view/
6294133cb0d5a7d1b780ece3
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 41072 W: 11052 L: 10908 D: 19112
Ptnml(0-2): 153, 4324, 11461, 4422, 176
Passed LTC
ltc: https://tests.stockfishchess.org/tests/view/
62947ae6b0d5a7d1b780fe86
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 102736 W: 27509 L: 27459 D: 47768
Ptnml(0-2): 98, 9734, 31669, 9754, 113
closes https://github.com/official-stockfish/Stockfish/pull/4045
Bench:
6410652
Michael Chaly [Mon, 30 May 2022 10:30:59 +0000 (13:30 +0300)]
Add info about elo gained from some heuristics
Add info about qsearch and impact of main and continuation histories.
Based on these tests:
https://tests.stockfishchess.org/tests/view/
62946ffcb0d5a7d1b780fc7e
https://tests.stockfishchess.org/tests/view/
628facb71e7cd5f299669534
https://tests.stockfishchess.org/tests/view/
628eade11e7cd5f299666f2e
closes https://github.com/official-stockfish/Stockfish/pull/4041
No functional change.
xoto10 [Thu, 19 May 2022 07:51:40 +0000 (08:51 +0100)]
Adjust scale param higher
xoto10's scaleopt tune resulted in a yellow LTC, but the main parameter shift looked almost exactly like the tune rate reduction schedule,
so further increases of that param were tried. Joint work xoto10 and dubslow.
passed LTC:
https://tests.stockfishchess.org/tests/view/
628c709372775f382300f03e
LLR: 2.93 (-2.94,2.94) <0.50,3.00>
Total: 70112 W: 18932 L: 18584 D: 32596
Ptnml(0-2): 66, 6904, 20757, 7274, 55
failed STC:
https://tests.stockfishchess.org/tests/view/
6290e4441e7cd5f29966bdc8
LLR: -2.96 (-2.94,2.94) <0.00,2.50>
Total: 59976 W: 15919 L: 16018 D: 28039
Ptnml(0-2): 250, 6791, 15974, 6754, 219
similar LTC's were yellow
first yellow LTC: https://tests.stockfishchess.org/tests/view/
6288a33f817227d3e5c5b05d
double exaggerate yellow: https://tests.stockfishchess.org/tests/live_elo/
628e140372775f38230129a6
triple exaggerate yellow: https://tests.stockfishchess.org/tests/live_elo/
628e2caf72775f3823012d45
closes https://github.com/official-stockfish/Stockfish/pull/4036
bench
6410652
proukornew [Thu, 16 Dec 2021 21:41:29 +0000 (00:41 +0300)]
Improve handling of variables set in the make environment
removes duplication on the commandline for example in a profile-build
closes https://github.com/official-stockfish/Stockfish/pull/3859
No functional change
Giacomo Lorenzetti [Sun, 22 May 2022 10:47:30 +0000 (12:47 +0200)]
Small speedup in futility_move_count
The speedup is around 0.25% using gcc 11.3.1 (bmi2, nnue bench, depth 16
and 23) while it is neutral using clang (same conditions).
According to `perf` that integer division was one of the most time-consuming
instructions in search (gcc disassembly).
Passed STC:
https://tests.stockfishchess.org/tests/view/
628a17fe24a074e5cd59b3aa
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 22232 W: 5992 L: 5751 D: 10489
Ptnml(0-2): 88, 2235, 6218, 2498, 77
yellow LTC:
https://tests.stockfishchess.org/tests/view/
628a35d7ccae0450e35106f7
LLR: -2.95 (-2.94,2.94) <0.50,3.00>
Total: 320168 W: 85853 L: 85326 D: 148989
Ptnml(0-2): 185, 29698, 99821, 30165, 215
This patch also suggests that UHO STC is sensible to small speedups (< 0.50%).
closes https://github.com/official-stockfish/Stockfish/pull/4032
No functional change
Joost VandeVondele [Fri, 20 May 2022 05:42:33 +0000 (07:42 +0200)]
Add command line flags to link to information
This patch provides command line flags `--help` and `--license` as well as the corresponding `help` and `license` commands.
```
$ ./stockfish --help
Stockfish 200522 by the Stockfish developers (see AUTHORS file)
Stockfish is a powerful chess engine and free software licensed under the GNU GPLv3.
Stockfish is normally used with a separate graphical user interface (GUI).
Stockfish implements the universal chess interface (UCI) to exchange information.
For further information see https://github.com/official-stockfish/Stockfish#readme
or the corresponding README.md and Copying.txt files distributed with this program.
```
The idea is to provide a minimal help that links to the README.md file,
not replicating information that is already available elsewhere.
We use this opportunity to explicitly report the license as well.
closes https://github.com/official-stockfish/Stockfish/pull/4027
No functional change.
Giacomo Lorenzetti [Fri, 1 Apr 2022 16:33:25 +0000 (18:33 +0200)]
Assorted small cleanups
closes https://github.com/official-stockfish/Stockfish/pull/3973
No functional change
candirufish [Sat, 21 May 2022 02:20:09 +0000 (04:20 +0200)]
Simplify a condition
Principal variation depth late move reduction extension simplification.
stc:
https://tests.stockfishchess.org/tests/view/
6285a1d19d18a78568e7fa24
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 428536 W: 113433 L: 113851 D: 201252
Ptnml(0-2): 1671, 48606, 114090, 48272, 1629
ltc:
https://tests.stockfishchess.org/tests/view/
62871d20375cdc5de8cf5db3
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 56792 W: 15123 L: 15011 D: 26658
Ptnml(0-2): 42, 5681, 16825, 5819, 29
closes https://github.com/official-stockfish/Stockfish/pull/4028
bench:
6501437
xoto10 [Sun, 15 May 2022 12:14:28 +0000 (13:14 +0100)]
Tune scale and optimism.
Tune scale and optimism in effort to make stockfish play more aggressively.
STC @ 10+0.1 th 1:
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 27896 W: 7506 L: 7248 D: 13142
Ptnml(0-2): 103, 3047, 7388, 3309, 101
https://tests.stockfishchess.org/tests/live_elo/
627fd0cfab44257388ab1f13
LTC @ 60+0.6 th 1:
LLR: 2.93 (-2.94,2.94) <0.50,3.00>
Total: 65576 W: 17512 L: 17178 D: 30886
Ptnml(0-2): 37, 6397, 19587, 6729, 38
https://tests.stockfishchess.org/tests/live_elo/
627ff666ab44257388ab256d
closes https://github.com/official-stockfish/Stockfish/pull/4025
Bench
6407734
disservin [Sat, 14 May 2022 10:10:13 +0000 (12:10 +0200)]
SE depth scaling using the previous depth
This patch makes the SE depth condition more robust and allows it to scale with completed depth
from a previous search.
At long TC this patch is almost equivalent to https://github.com/official-stockfish/Stockfish/pull/4016 which had
VLTC:
https://tests.stockfishchess.org/tests/view/
626abd7e8707aa698c0093a8
Elo: 2.35 +-1.5 (95%) LOS: 99.9%
Total: 40000 W: 10991 L: 10720 D: 18289
Ptnml(0-2): 8, 3534, 12648, 3799, 11
nElo: 5.47 +-3.4 (95%) PairsRatio: 1.08
VLTC multicore:
https://tests.stockfishchess.org/tests/view/
6272a6afc8f14123163c1997
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 86808 W: 24165 L: 23814 D: 38829
Ptnml(0-2): 11, 7253, 28524, 7606, 10
however, it is now also gaining at LTC:
LTC:
https://tests.stockfishchess.org/tests/view/
627e7cb523c0c72a05b651a9
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 27064 W: 7285 L: 7046 D: 12733
Ptnml(0-2): 8, 2446, 8390, 2675, 13
and should have nearly no influence at STC as depth 27 is rarely reached.
It was noticed that initializing the threshold with MAX_PLY, had an adverse effect,
possibly because the first move is sensitive to this.
closes https://github.com/official-stockfish/Stockfish/pull/4021
closes https://github.com/official-stockfish/Stockfish/pull/4016
Bench:
6481017
Tomasz Sobczyk [Fri, 13 May 2022 15:26:50 +0000 (17:26 +0200)]
Update NNUE architecture to SFNNv5. Update network to nn-
3c0aa92af1da .nnue.
Architecture changes:
Duplicated activation after the 1024->15 layer with squared crelu (so 15->15*2). As proposed by vondele.
Trainer changes:
Added bias to L1 factorization, which was previously missing (no measurable improvement but at least neutral in principle)
For retraining linearly reduce lambda parameter from 1.0 at epoch 0 to 0.75 at epoch 800.
reduce max_skipping_rate from 15 to 10 (compared to vondele's outstanding PR)
Note: This network was trained with a ~0.8% error in quantization regarding the newly added activation function.
This will be fixed in the released trainer version. Expect a trainer PR tomorrow.
Note: The inference implementation cuts a corner to merge results from two activation functions.
This could possibly be resolved nicer in the future. AVX2 implementation likely not necessary, but NEON is missing.
First training session invocation:
python3 train.py \
../nnue-pytorch-training/data/nodes5000pv2_UHO.binpack \
../nnue-pytorch-training/data/nodes5000pv2_UHO.binpack \
--gpus "$3," \
--threads 4 \
--num-workers 8 \
--batch-size 16384 \
--progress_bar_refresh_rate 20 \
--random-fen-skipping 3 \
--features=HalfKAv2_hm^ \
--lambda=1.0 \
--max_epochs=400 \
--default_root_dir ../nnue-pytorch-training/experiment_$1/run_$2
Second training session invocation:
python3 train.py \
../nnue-pytorch-training/data/T60T70wIsRightFarseerT60T74T75T76.binpack \
../nnue-pytorch-training/data/T60T70wIsRightFarseerT60T74T75T76.binpack \
--gpus "$3," \
--threads 4 \
--num-workers 8 \
--batch-size 16384 \
--progress_bar_refresh_rate 20 \
--random-fen-skipping 3 \
--features=HalfKAv2_hm^ \
--start-lambda=1.0 \
--end-lambda=0.75 \
--gamma=0.995 \
--lr=4.375e-4 \
--max_epochs=800 \
--resume-from-model /data/sopel/nnue/nnue-pytorch-training/data/exp367/nn-exp367-run3-epoch399.pt \
--default_root_dir ../nnue-pytorch-training/experiment_$1/run_$2
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 27288 W: 7445 L: 7178 D: 12665
Ptnml(0-2): 159, 3002, 7054, 3271, 158
https://tests.stockfishchess.org/tests/view/
627e8c001919125939623644
Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 21792 W: 5969 L: 5727 D: 10096
Ptnml(0-2): 25, 2152, 6294, 2406, 19
https://tests.stockfishchess.org/tests/view/
627f2a855734b18b2e2ece47
closes https://github.com/official-stockfish/Stockfish/pull/4020
Bench:
6481017
Stéphane Nicolet [Wed, 4 May 2022 05:39:23 +0000 (07:39 +0200)]
Reduce depth after score improvement at PV nodes
STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 73760 W: 19590 L: 19244 D: 34926
Ptnml(0-2): 285, 8352, 19292, 8634, 317
https://tests.stockfishchess.org/tests/view/
626eb2dc9116b52aa83b73da
LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.00>
Total: 114400 W: 30561 L: 30111 D: 53728
Ptnml(0-2): 68, 11432, 33785, 11812, 103
https://tests.stockfishchess.org/tests/view/
626f730859e9c431e0b10b21
closes https://github.com/official-stockfish/Stockfish/pull/4008
bench:
6174823
candirufish [Tue, 3 May 2022 10:35:21 +0000 (12:35 +0200)]
Use fail high count for LMR
Increase reduction if next ply has a lot of fail high else reset count to 0
Passed STC:
https://tests.stockfishchess.org/tests/view/
626ea8299116b52aa83b71f6
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 144288 W: 38377 L: 37902 D: 68009
Ptnml(0-2): 565, 16298, 38054, 16551, 676
Passed LTC:
https://tests.stockfishchess.org/tests/view/
626fa0fb79f761bab2e382f0
LLR: 2.98 (-2.94,2.94) <0.50,3.00>
Total: 74872 W: 20050 L: 19686 D: 35136
Ptnml(0-2): 51, 7541, 21893, 7895, 56
closes https://github.com/official-stockfish/Stockfish/pull/4006
bench:
7084802
Stefan Geschwentner [Wed, 27 Apr 2022 11:09:53 +0000 (13:09 +0200)]
Simplify time management.
Replace the best move instability adjustment factor by a simpler version which doesn't have a dependency on the iteration depth.
STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 30800 W: 8232 L: 8073 D: 14495
Ptnml(0-2): 101, 3309, 8444, 3422, 124
https://tests.stockfishchess.org/tests/view/
6266c77bc5b924ba22908d30
LTC:
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 61664 W: 16375 L: 16272 D: 29017
Ptnml(0-2): 40, 5869, 18897, 6000, 26
https://tests.stockfishchess.org/tests/view/
6266fc39b3d1812808915f23
closes https://github.com/official-stockfish/Stockfish/pull/3999
Bench:
7729968
candirufish [Fri, 22 Apr 2022 06:03:50 +0000 (08:03 +0200)]
Negative extension for ttMove that is less than alpha and value
in the context of singular extensions
Passed STC:
https://tests.stockfishchess.org/tests/view/
626047e8b03f22647441ade0
LLR: 2.97 (-2.94,2.94) <0.00,2.50>
Total: 50296 W: 13410 L: 13108 D: 23778
Ptnml(0-2): 196, 5548, 13370, 5826, 208
Passed LTC:
https://tests.stockfishchess.org/tests/view/
6260a513b03f22647441b970
LLR: 2.96 (-2.94,2.94) <0.50,3.00>
Total: 83896 W: 22433 L: 22054 D: 39409
Ptnml(0-2): 49, 8273, 24938, 8626, 62
closes https://github.com/official-stockfish/Stockfish/pull/3995
bench:
7729968
Michael Chaly [Thu, 21 Apr 2022 12:28:23 +0000 (15:28 +0300)]
Simplify away best move count logic
the only place where it was used it was true with >99% probability so it seemed to not be doing much any more.
Passed STC:
https://tests.stockfishchess.org/tests/view/
625f4778d00da81c22dd4c93
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 85152 W: 22487 L: 22406 D: 40259
Ptnml(0-2): 313, 9035, 23818, 9078, 332
Passed LTC:
https://tests.stockfishchess.org/tests/view/
625ff1f1b03f22647441a215
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 66776 W: 17768 L: 17673 D: 31335
Ptnml(0-2): 46, 6200, 20792, 6313, 37
close https://github.com/official-stockfish/Stockfish/pull/3993
bench
7280798
Joost VandeVondele [Mon, 18 Apr 2022 05:34:03 +0000 (07:34 +0200)]
Update default net to nn-
d0b74ce1e5eb .nnue
train a net using training data with a
heavier weight on positions having 16 pieces on the board. More specifically,
with a relative weight of `i * (32-i)/(16 * 16)+1` (where i is the number of pieces on the board).
This is done with the trainer branch https://github.com/glinscott/nnue-pytorch/pull/173
The command used is:
```
python train.py $datafile $datafile $restarttype $restartfile --gpus 1 --threads 4 --num-workers 12 --random-fen-skipping=3 --batch-size 16384 --progress_bar_refresh_rate 300 --smart-fen-skipping --features=HalfKAv2_hm^ --lambda=1.00 --max_epochs=$epochs --seed $RANDOM --default_root_dir exp/run_$i
```
The datafile is T60T70wIsRightFarseerT60T74T75T76.binpack, the restart is from the master net.
passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 22728 W: 6197 L: 5945 D: 10586
Ptnml(0-2): 105, 2453, 6001, 2695, 110
https://tests.stockfishchess.org/tests/view/
625cf944ff677a888877cd90
passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 35664 W: 9535 L: 9264 D: 16865
Ptnml(0-2): 30, 3524, 10455, 3791, 32
https://tests.stockfishchess.org/tests/view/
625d3c32ff677a888877d7ca
closes https://github.com/official-stockfish/Stockfish/pull/3989
Bench:
7269563
Joost VandeVondele [Mon, 18 Apr 2022 21:05:24 +0000 (23:05 +0200)]
Restore development version
No functional change.
Joost VandeVondele [Mon, 18 Apr 2022 08:17:57 +0000 (10:17 +0200)]
Stockfish 15
Official release version of Stockfish 15
Bench:
8129754
---
A new major release of Stockfish is now available at https://stockfishchess.org
Stockfish 15 continues to push the boundaries of chess, providing unrivalled
analysis and playing strength. In our testing, Stockfish 15 is ahead of
Stockfish 14 by 36 Elo points and wins nine times more game pairs than it
loses[1].
Improvements to the engine have made it possible for Stockfish to end up
victorious in tournaments at all sorts of time controls ranging from bullet to
classical and even at Fischer random chess[2]. At CCC, Stockfish won all of
the latest tournaments: CCC 16 Bullet, Blitz and Rapid, CCC 960 championship,
and the CCC 17 Rapid. At TCEC, Stockfish won the Season 21, Cup 9, FRC 4 and
in the current Season 22 superfinal, at the time of writing, has won 16 game
pairs and not yet lost a single one.
This progress is the result of a dedicated team of developers that comes up
with new ideas and improvements. For Stockfish 15, we tested nearly 13000
different changes and retained the best 200. These include the fourth
generation of our NNUE network architecture, as well as various search
improvements. To perform these tests, contributors provide CPU time for
testing, and in the last year, they have collectively played roughly a
billion chess games. In the last few years, our distributed testing
framework, Fishtest, has been operated superbly and has been developed and
improved extensively. This work by Pasquale Pigazzini, Tom Vijlbrief, Michel
Van den Bergh, and various other developers[3] is an essential part of the
success of the Stockfish project.
Indeed, the Stockfish project builds on a thriving community of enthusiasts
to offer a free and open-source chess engine that is robust, widely
available, and very strong. We invite our chess fans to join the Fishtest
testing framework and programmers to contribute to the project[4].
The Stockfish team
[1] https://tests.stockfishchess.org/tests/view/
625d156dff677a888877d1be
[2] https://en.wikipedia.org/wiki/Stockfish_(chess)#Competition_results
[3] https://github.com/glinscott/fishtest/blob/master/AUTHORS
[4] https://stockfishchess.org/get-involved/
KJE-98 [Fri, 15 Apr 2022 02:09:50 +0000 (22:09 -0400)]
Decrease LMR at PV nodes with low depth.
This patch lessens the Late Move Reduction at PV nodes with low depth. Previously the affect of depth on LMR was independant of nodeType. The idea behind this patch is that at PV nodes, LMR at low depth is will miss out on potential alpha-raising moves.
Passed STC:
https://tests.stockfishchess.org/tests/view/
625aa867d3367522c4b8965c
LLR: 2.93 (-2.94,2.94) <0.00,2.50>
Total: 19360 W: 5252 L: 5006 D: 9102
Ptnml(0-2): 79, 2113, 5069, 2321, 98
Passed LTC:
https://tests.stockfishchess.org/tests/view/
625ae844d3367522c4b8a009
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 39264 W: 10636 L: 10357 D: 18271
Ptnml(0-2): 18, 3928, 11473, 4183, 30
closes https://github.com/official-stockfish/Stockfish/pull/3985
bench:
8129754
FauziAkram [Tue, 12 Apr 2022 17:45:25 +0000 (20:45 +0300)]
Tuning classical and NNUE scaling terms
changes to parameters in both classical and NNUE scaling, following up from an earlier successful #3958
passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 23936 W: 6490 L: 6234 D: 11212
Ptnml(0-2): 107, 2610, 6306, 2810, 135
https://tests.stockfishchess.org/tests/view/
625820aa33c40bb9d964e6ae
passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 50376 W: 13629 L: 13327 D: 23420
Ptnml(0-2): 20, 4979, 14920, 5217, 52
https://tests.stockfishchess.org/tests/view/
62584592c1d7f5008a33a4d1
closes https://github.com/official-stockfish/Stockfish/pull/3982
Bench:
6964954
Joost VandeVondele [Fri, 15 Apr 2022 15:23:51 +0000 (17:23 +0200)]
Update WDL model for current SF
This updates the WDL model based on the LTC statistics for the last month (8M games).
for old results see:
https://github.com/official-stockfish/Stockfish/pull/3582
https://github.com/official-stockfish/Stockfish/pull/2778
the model changed a bit from the past, some images to follow in the PR
closes https://github.com/official-stockfish/Stockfish/pull/3981
No functional change.
Joost VandeVondele [Thu, 14 Apr 2022 21:00:14 +0000 (23:00 +0200)]
Update CPU contributors
closes https://github.com/official-stockfish/Stockfish/pull/3979
No functional change
Topologist [Sat, 9 Apr 2022 06:55:40 +0000 (08:55 +0200)]
Use NNUE in low piece endgames close to the root.
This patch enforces that NNUE evaluation is used for endgame positions at shallow depth (depth <= 9).
Classic evaluation will still be used for high imbalance positions when the depth is high or there are many pieces.
Passed STC:
https://tests.stockfishchess.org/tests/view/
624c193b3a8a6ac93892dc27
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 255840 W: 68024 L: 67362 D: 120454
Ptnml(0-2): 1074, 27089, 70926, 27763, 1068
Passed LTC:
https://tests.stockfishchess.org/tests/view/
624e8675e9e7821808467f77
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 67088 W: 17784 L: 17454 D: 31850
Ptnml(0-2): 45, 6209, 20715, 6521, 54
closes https://github.com/official-stockfish/Stockfish/pull/3978
bench:
6602222
mstembera [Thu, 31 Mar 2022 01:14:27 +0000 (18:14 -0700)]
Minor cleanups
simplify and relocate to position.cpp some of the recent threat calculations used in the movepicker.
passed STC:
https://tests.stockfishchess.org/tests/view/
62468c301f682ea45ce3b3b9
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 76544 W: 20247 L: 20152 D: 36145
Ptnml(0-2): 327, 8113, 21317, 8168, 347
closes https://github.com/official-stockfish/Stockfish/pull/3972
No functional change
Topologist [Mon, 28 Mar 2022 09:50:08 +0000 (11:50 +0200)]
Play more positional in endgames
This patch chooses the delta value (which skews the nnue evaluation between positional and materialistic)
depending on the material: If the material is low, delta will be higher and the evaluation is shifted
to the positional value. If the material is high, the evaluation will be shifted to the psqt value.
I don't think slightly negative values of delta should be a concern.
Passed STC:
https://tests.stockfishchess.org/tests/view/
62418513b3b383e86185766f
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 28808 W: 7832 L: 7564 D: 13412
Ptnml(0-2): 147, 3186, 7505, 3384, 182
Passed LTC:
https://tests.stockfishchess.org/tests/view/
62419137b3b383e861857842
LLR: 2.96 (-2.94,2.94) <0.50,3.00>
Total: 58632 W: 15776 L: 15450 D: 27406
Ptnml(0-2): 42, 5889, 17149, 6173, 63
closes https://github.com/official-stockfish/Stockfish/pull/3971
Bench:
7588855
Michael Chaly [Mon, 28 Mar 2022 11:15:56 +0000 (14:15 +0300)]
In movepicker increase priority for moves that evade a capture
This idea is a mix of koivisto idea of threat history and heuristic that
was simplified some time ago in LMR - decreasing reduction for moves that evade a capture.
Instead of doing so in LMR this patch does it in movepicker - to do this it
calculates squares that are attacked by different piece types and pieces that are located
on this squares and boosts up weight of moves that make this pieces land on a square that is not under threat.
Boost is greater for pieces with bigger material values.
Special thanks to koivisto and seer authors for explaining me ideas behind threat history.
Passed STC:
https://tests.stockfishchess.org/tests/view/
62406e473b32264b9aa1478b
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 19816 W: 5320 L: 5072 D: 9424
Ptnml(0-2): 86, 2165, 5172, 2385, 100
Passed LTC:
https://tests.stockfishchess.org/tests/view/
62407f2e3b32264b9aa149c8
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 51200 W: 13805 L: 13500 D: 23895
Ptnml(0-2): 44, 5023, 15164, 5322, 47
closes https://github.com/official-stockfish/Stockfish/pull/3970
bench
7736491
Giacomo Lorenzetti [Wed, 23 Mar 2022 11:04:10 +0000 (12:04 +0100)]
Remove pos.capture_or_promotion()
This patch replaces `pos.capture_or_promotion()` with `pos.capture()`
and comes after a few attempts with elo-gaining bounds, two of which
failed yellow at LTC
(https://tests.stockfishchess.org/tests/view/
622f8f0cc9e950cbfc237024
and
https://tests.stockfishchess.org/tests/view/
62319a8bb3b498ba71a6b2dc ).
Passed non-regression STC:
https://tests.stockfishchess.org/tests/view/
623aff7eea447151c74828d3
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 246864 W: 65462 L: 65618 D: 115784
Ptnml(0-2): 1201, 28116, 65001, 27866, 1248
Passed non-regression LTC:
https://tests.stockfishchess.org/tests/view/
623c1fdcea447151c7484fb0
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 30120 W: 8125 L: 7978 D: 14017
Ptnml(0-2): 22, 2993, 8881, 3144, 20
closes https://github.com/official-stockfish/Stockfish/pull/3968
Bench:
6847732
Stefan Geschwentner [Tue, 15 Mar 2022 15:53:59 +0000 (16:53 +0100)]
Remove ttPv tree shrinking.
Via the ttPv flag an implicit tree of current and former PV nodes is maintained. In addition this tree is grown or shrinked at the leafs dependant on the search results. But now the shrinking step has been removed.
As the frequency of ttPv nodes decreases with depth the shown scaling behavior (STC barely passed but LTC scales well) of the tests was expected.
STC:
LLR: 2.93 (-2.94,2.94) <-2.25,0.25>
Total: 270408 W: 71593 L: 71785 D: 127030
Ptnml(0-2): 1339, 31024, 70630, 30912, 1299
https://tests.stockfishchess.org/tests/view/
622fbf9dc9e950cbfc2376d6
LTC:
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 34368 W: 9135 L: 8992 D: 16241
Ptnml(0-2): 28, 3423, 10135, 3574, 24
https://tests.stockfishchess.org/tests/view/
62305257c9e950cbfc238964
closes https://github.com/official-stockfish/Stockfish/pull/3963
Bench:
7044203
mstembera [Sat, 12 Mar 2022 15:00:58 +0000 (07:00 -0800)]
Small cleanups (2)
- fix a small compile error under MSVC
- improve sigmoid comment and assert
- fix formatting in README.md
closes https://github.com/official-stockfish/Stockfish/pull/3960
No functional change
Giacomo Lorenzetti [Sat, 5 Feb 2022 09:18:50 +0000 (10:18 +0100)]
Small cleanups
Delete cast to int in movepick.
update AUTHORS.
adjust assert in sigmoid.
fix spelling mistakes in README
closes https://github.com/official-stockfish/Stockfish/pull/3922
closes https://github.com/official-stockfish/Stockfish/pull/3948
closes https://github.com/official-stockfish/Stockfish/pull/3942
No functional change
FauziAkram [Wed, 9 Mar 2022 15:40:54 +0000 (18:40 +0300)]
Improvements in Evaluation
adjust parameters in classical evaluation and NNUE scaling.
STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 37104 W: 9983 L: 9701 D: 17420
Ptnml(0-2): 154, 4187, 9651, 4343, 217
https://tests.stockfishchess.org/tests/view/
6228cb13a9d47c8160e885ba
LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 266792 W: 71101 L: 70295 D: 125396
Ptnml(0-2): 214, 26928, 78353, 27640, 261
https://tests.stockfishchess.org/tests/view/
6228d3c4a9d47c8160e887b0
closes https://github.com/official-stockfish/Stockfish/pull/3958
Bench:
6739741
Michael Chaly [Tue, 8 Mar 2022 07:56:07 +0000 (10:56 +0300)]
Decrease reductions in Lmr for some Pv nodes
This patch makes us reduce less in Lmr at pv nodes in case of static eval being far away from static evaluation of position.
Idea is that if it's the case then probably position is pretty complex so we can't be sure about how reliable LMR is so we need to reduce less.
Passed STC:
https://tests.stockfishchess.org/tests/view/
6226276aa9d47c8160e81220
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 262696 W: 69944 L: 69239 D: 123513
Ptnml(0-2): 1399, 29702, 68436, 30417, 1394
Passed LTC:
https://tests.stockfishchess.org/tests/view/
6226b002a9d47c8160e82b91
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 64008 W: 17320 L: 16982 D: 29706
Ptnml(0-2): 60, 6378, 18811, 6674, 81
closes https://github.com/official-stockfish/Stockfish/pull/3957
bench
6678390
Ben Chaney [Tue, 1 Mar 2022 22:49:02 +0000 (17:49 -0500)]
Generalize the feature transform to use vec_t macros
This commit generalizes the feature transform to use vec_t macros
that are architecture defined instead of using a seperate code path for each one.
It should make some old architectures (MMX, including improvements by Fanael) faster
and make further such improvements easier in the future.
Includes some corrections to CI for mingw.
closes https://github.com/official-stockfish/Stockfish/pull/3955
closes https://github.com/official-stockfish/Stockfish/pull/3928
No functional change
Giacomo Lorenzetti [Tue, 1 Mar 2022 08:34:40 +0000 (09:34 +0100)]
Sort captures
This patch (partially) sort captures in analogy to quiet moves. All
three movepickers are affected, hence `depth` is added as an argument in
probcut's.
Passed STC:
https://tests.stockfishchess.org/tests/view/
621a4576da649bba32ef6fd4
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 103848 W: 27884 L: 27473 D: 48491
Ptnml(0-2): 587, 11691, 26974, 12068, 604
Passed LTC:
https://tests.stockfishchess.org/tests/view/
621aaa5bda649bba32ef7c2d
LLR: 2.96 (-2.94,2.94) <0.50,3.00>
Total: 212032 W: 56420 L: 55739 D: 99873
Ptnml(0-2): 198, 21310, 62348, 21933, 227
closes https://github.com/official-stockfish/Stockfish/pull/3952
Bench:
6833580
Tomasz Sobczyk [Sun, 27 Feb 2022 16:02:13 +0000 (17:02 +0100)]
Use dynamic allocation for evaluation scratch TLS buffer.
fixes #3946 an issue related with the toolchain as found in xcode 12 on macOS,
related to previous commit
5f781d36 .
closes https://github.com/official-stockfish/Stockfish/pull/3950
No functional change
mstembera [Thu, 24 Feb 2022 02:19:36 +0000 (18:19 -0800)]
Clean up and simplify some nnue code.
Remove some unnecessary code and it's execution during inference. Also the change on line 49 in nnue_architecture.h results in a more efficient SIMD code path through ClippedReLU::propagate().
passed STC:
https://tests.stockfishchess.org/tests/view/
6217d3bfda649bba32ef25d5
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 12056 W: 3281 L: 3092 D: 5683
Ptnml(0-2): 55, 1213, 3312, 1384, 64
passed STC SMP:
https://tests.stockfishchess.org/tests/view/
6217f344da649bba32ef295e
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 27376 W: 7295 L: 7137 D: 12944
Ptnml(0-2): 52, 2859, 7715, 3003, 59
closes https://github.com/official-stockfish/Stockfish/pull/3944
No functional change
bench:
6820724
Michael Chaly [Sat, 19 Feb 2022 15:24:11 +0000 (18:24 +0300)]
Adjust usage of LMR for 2nd move in move ordering
Current master prohibits usage of LMR for 2nd move at rootNode. This patch also disables LMR for 2nd move not only at rootNode but also at first PvNode that is a reply to rootNode.
passed STC:
https://tests.stockfishchess.org/tests/view/
620e8c9026f5b17ec885143a
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 54096 W: 14305 L: 13996 D: 25795
Ptnml(0-2): 209, 6075, 14192, 6342, 230
passed LTC:
https://tests.stockfishchess.org/tests/view/
620eb327b1792e8985f81fb8
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 110864 W: 29602 L: 29156 D: 52106
Ptnml(0-2): 112, 11147, 32455, 11619, 99
closes https://github.com/official-stockfish/Stockfish/pull/3940
bench
6820724
Joost VandeVondele [Sun, 20 Feb 2022 16:36:19 +0000 (17:36 +0100)]
Fix clang warning on unused variable
mark variable as used.
fixes https://github.com/official-stockfish/Stockfish/issues/3900
closes https://github.com/official-stockfish/Stockfish/pull/3941
No functional change