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LMR Capture Tweak

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Increase capture reduction by comparing opponent's stat score

STC: (Yellow)
LLR: -2.96 (-2.94,2.94) [0.00,5.00]
Total: 92291 W: 18647 L: 18350 D: 55294
http://tests.stockfishchess.org/tests/view/5b04225e0ebc5914abc1291b

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 20176 W: 3061 L: 2868 D: 14247
http://tests.stockfishchess.org/tests/view/5b04bb3f0ebc5914abc129a3

How to continue?
• we could try a different value for the capture history threeshold

Closes https://github.com/official-stockfish/Stockfish/pull/1612

Bench: 5167159
This commit is contained in:
VoyagerOne 2018-05-24 19:05:36 +02:00 • committed by Stéphane Nicolet
parent d5d23bfd2d
commit 3d6995eae8
1 changed files with 7 additions and 0 deletions
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7
src/search.cpp
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@ -995,7 +995,14 @@ moves_loop: // When in check, search starts from here
Depth r = reduction<PvNode>(improving, depth, moveCount);
if (captureOrPromotion) // (~5 Elo)
{
//Increase reduction by comparing opponent's stat score
if ( (ss-1)->statScore >= 0
&& thisThread->captureHistory[movedPiece][to_sq(move)][type_of(pos.captured_piece())] < 0)
r += ONE_PLY;
r -= r ? ONE_PLY : DEPTH_ZERO;
}
else
{
// Decrease reduction if opponent's move count is high (~5 Elo)