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3ac3b68)
Tweak stat bonus formula on top of latest elo gain by @snicolet
STC
http://tests.stockfishchess.org/tests/view/
5b830a810ebc5902bdbb7e9c
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 27797 W: 6113 L: 5842 D: 15842
LTC
http://tests.stockfishchess.org/tests/view/
5b831f2c0ebc5902bdbb8038
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 13655 W: 2294 L: 2099 D: 9262
I think that more elo can be found in tweaks of this parameters so I plan
to further try some "hand-tuning", including increasing/decreasing ratio of
two constants and making bonus assimetric to 0. Thx to @AndyGrant for helping
with github and @jerrydonaldwatson for original idea.
Closes https://github.com/official-stockfish/Stockfish/pull/1748
Bench:
4172767
else
{
int p = (ss-1)->statScore;
else
{
int p = (ss-1)->statScore;
- int malus = p > 0 ? (p + 5000) / 1024 :
- p < 0 ? (p - 5000) / 1024 : 0;
+ int bonus = p > 0 ? (-p - 2500) / 512 :
+ p < 0 ? (-p + 2500) / 512 : 0;
- ss->staticEval = eval = (ss-1)->currentMove != MOVE_NULL ? (pureStaticEval = evaluate(pos)) - malus
+ ss->staticEval = eval = (ss-1)->currentMove != MOVE_NULL ? (pureStaticEval = evaluate(pos)) + bonus
: (pureStaticEval = -(ss-1)->staticEval + 2 * Eval::Tempo);
tte->save(posKey, VALUE_NONE, BOUND_NONE, DEPTH_NONE, MOVE_NONE, pureStaticEval);
: (pureStaticEval = -(ss-1)->staticEval + 2 * Eval::Tempo);
tte->save(posKey, VALUE_NONE, BOUND_NONE, DEPTH_NONE, MOVE_NONE, pureStaticEval);