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Tweak ttCapture reduction

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More reduction at shallow depth for quiet moves when ttMove is a capture.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 365728 W: 95896 L: 95090 D: 174742
Ptnml(0-2): 1283, 43133, 93262, 43867, 1319
https://tests.stockfishchess.org/tests/view/66edd35986d5ee47d953b0d5

Passed LTC:
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 200526 W: 51197 L: 50540 D: 98789
Ptnml(0-2): 119, 21952, 55462, 22613, 117
https://tests.stockfishchess.org/tests/view/66f405dc86d5ee47d953b460

closes https://github.com/official-stockfish/Stockfish/pull/5610

bench: 1269487
This commit is contained in:
Taras Vuk 2024-09-30 18:58:48 +02:00 • committed by Joost VandeVondele
parent d6043970bd
commit c85f802185
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1157,7 +1157,7 @@ moves_loop: // When in check, search starts here
// Increase reduction if ttMove is a capture but the current move is not a capture (~3 Elo)
if (ttCapture && !capture)
r++;
r += 1 + (depth < 8);
// Increase reduction if next ply has a lot of fail high (~5 Elo)
if ((ss + 1)->cutoffCnt > 3)