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Do lmr for more captures

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Based on machinery introduced by vondele. Logic behind patch if relatively simple -
if we reduce less with high hit rate of transposition table somewhat logical is to
reduce more with low hit rate. For example enable all captures for LMR.

Threshold 0.375 is arbitrary and can be tweaked :)

STC
http://tests.stockfishchess.org/tests/view/5dd4d51df531e81cf278eaac
LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 16495 W: 3591 L: 3434 D: 9470

LTC
http://tests.stockfishchess.org/tests/view/5dd52265f531e81cf278eace
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 23598 W: 3956 L: 3716 D: 15926

Closes https://github.com/official-stockfish/Stockfish/pull/2420

Bench: 5067870
This commit is contained in:
Vizvezdenec 2019-11-20 23:20:20 +03:00 • committed by Stéphane Nicolet
parent 37698b0396
commit 3f4191392c
1 changed files with 2 additions and 1 deletions
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3
src/search.cpp
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@ -1084,7 +1084,8 @@ moves_loop: // When in check, search starts from here
&& ( !captureOrPromotion && ( !captureOrPromotion
|| moveCountPruning || moveCountPruning
|| ss->staticEval + PieceValue[EG][pos.captured_piece()] <= alpha || ss->staticEval + PieceValue[EG][pos.captured_piece()] <= alpha
|| cutNode)) || cutNode
|| thisThread->ttHitAverage < 384 * ttHitAverageResolution * ttHitAverageWindow / 1024))
{ {
Depth r = reduction(improving, depth, moveCount); Depth r = reduction(improving, depth, moveCount);