From: Vizvezdenec <Vizvezdenec@gmail.com>
Date: Thu, 24 Dec 2020 22:11:09 +0000 (+0300)
Subject: Do more LMR for captures
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=51deae899814bbbfd9db5686b824f23105ca8a39

Do more LMR for captures

This patch enables LMR for all captures at allNodes that were not in PV.
Currently we do LMR for all captures at cutNodes so this is an expansion of this logic:
now we do LMR for all captures almost at all non-pv nodes,
excluding only allNodes that were in PV.

passed STC
https://tests.stockfishchess.org/tests/view/5fe50b9d3932f79192d3973c
LLR: 2.95 (-2.94,2.94) {-0.25,1.25}
Total: 83128 W: 7606 L: 7368 D: 68154
Ptnml(0-2): 292, 5905, 28939, 6129, 299

passed LTC
https://tests.stockfishchess.org/tests/view/5fe552e43932f79192d39744
LLR: 2.92 (-2.94,2.94) {0.25,1.25}
Total: 13968 W: 568 L: 466 D: 12934
Ptnml(0-2): 5, 418, 6043, 506, 12

closes https://github.com/official-stockfish/Stockfish/pull/3273

Bench: 4194835
---

diff --git a/src/search.cpp b/src/search.cpp
index e272c10b..60a002a9 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1172,6 +1172,7 @@ moves_loop: // When in check, search starts from here
               || moveCountPruning
               || ss->staticEval + PieceValue[EG][pos.captured_piece()] <= alpha
               || cutNode
+              || (!PvNode && !formerPv)
               || thisThread->ttHitAverage < 432 * TtHitAverageResolution * TtHitAverageWindow / 1024))
       {
           Depth r = reduction(improving, depth, moveCount);