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Introduce Fail Low History Bonus

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When a node fails low, give TT move a small bonus 1/4 of normal value.

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 92384 W: 24094 L: 23691 D: 44599
Ptnml(0-2): 323, 10852, 23465, 11203, 349
https://tests.stockfishchess.org/tests/view/66be80794ff211be9d4eed68

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 114660 W: 29260 L: 28778 D: 56622
Ptnml(0-2): 97, 12506, 31653, 12966, 108
https://tests.stockfishchess.org/tests/view/66bf63ee4ff211be9d4eeef0

closes https://github.com/official-stockfish/Stockfish/pull/5539

bench 1463003
This commit is contained in:
Shawn Xu 2024-08-15 16:24:56 -06:00 • committed by Joost VandeVondele
parent 6cf7f300ac
commit d275bf9643
1 changed files with 4 additions and 0 deletions
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4
src/search.cpp
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@ -1361,6 +1361,10 @@ moves_loop: // When in check, search starts here
<< stat_bonus(depth) * bonus / 25;
}
// Bonus when search fails low and there is a TT move
else if (moveCount > 1 && ttData.move && (cutNode || PvNode))
thisThread->mainHistory[us][ttData.move.from_to()] << stat_bonus(depth) / 4;
if (PvNode)
bestValue = std::min(bestValue, maxValue);