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Simplify LMR for captures

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Simplify LMR for captures by removing capture's stat score logic for reduction.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 37068 W: 7462 L: 7370 D: 22236
http://tests.stockfishchess.org/tests/view/5b115bc30ebc591af58a6fd2

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 80061 W: 11706 L: 11671 D: 56684
http://tests.stockfishchess.org/tests/view/5b117f590ebc59033d2d5315

Closes https://github.com/official-stockfish/Stockfish/pull/1631

Bench: 4470519
This commit is contained in:
VoyagerOne 2018-06-03 16:46:18 -04:00 • committed by Stéphane Nicolet
parent f7bae2de82
commit 6b5d671cdc
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@ -996,8 +996,7 @@ moves_loop: // When in check, search starts from here
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)
if ((ss-1)->statScore >= 0)
r += ONE_PLY;
r -= r ? ONE_PLY : DEPTH_ZERO;