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Increased reduction for captures in LMR

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It now does, in LMR, an increased on reduction by 1 for captures in cut nodes.

STC:
LLR: 2.93 (-2.94,2.94) <-0.50,2.50>
Total: 30656 W: 2565 L: 2397 D: 25694
Ptnml(0-2): 63, 2012, 11029, 2142, 82
https://tests.stockfishchess.org/tests/view/60a96733ce8ea25a3ef04178

LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.50>
Total: 124840 W: 4139 L: 3878 D: 116823
Ptnml(0-2): 48, 3480, 55100, 3747, 45
https://tests.stockfishchess.org/tests/view/60a995f5ce8ea25a3ef041b7

closes https://github.com/official-stockfish/Stockfish/pull/3494

bench: 3864295
This commit is contained in:
bmc4 2021-05-24 08:15:04 -03:00 • committed by Joost VandeVondele
parent a2f01c07eb
commit e044068b43
1 changed files with 4 additions and 4 deletions
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8
src/search.cpp
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@ -1151,16 +1151,16 @@ moves_loop: // When in check, search starts from here
if (singularQuietLMR)
r--;
// Increase reduction for cut nodes (~3 Elo)
if (cutNode)
r += 1 + !captureOrPromotion;
if (!captureOrPromotion)
{
// Increase reduction if ttMove is a capture (~3 Elo)
if (ttCapture)
r++;
// Increase reduction for cut nodes (~3 Elo)
if (cutNode)
r += 2;
ss->statScore = thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]