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bonus calculation for prior countermoves

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Introduce a new term to the bonus calculation for prior countermoves

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 140896 W: 36545 L: 36079 D: 68272
Ptnml(0-2): 383, 16505, 36217, 16949, 394
https://tests.stockfishchess.org/tests/view/6691c73cc6827afcdcee1816

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 126660 W: 32089 L: 31587 D: 62984
Ptnml(0-2): 63, 13774, 35154, 14276, 63
https://tests.stockfishchess.org/tests/view/6691cdc4c6827afcdcee1930

closes https://github.com/official-stockfish/Stockfish/pull/5483

bench: 1250388
This commit is contained in:
FauziAkram 2024-07-13 14:44:23 +03:00 • committed by Joost VandeVondele
parent 558abdbe8a
commit 7395d56832
1 changed files with 5 additions and 4 deletions
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9
src/search.cpp
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@ -1364,12 +1364,13 @@ moves_loop: // When in check, search starts here
// Bonus for prior countermove that caused the fail low
else if (!priorCapture && prevSq != SQ_NONE)
{
int bonus = (114 * (depth > 5) + 116 * (PvNode || cutNode) + 123 * ((ss - 1)->moveCount > 8)
+ 64 * (!ss->inCheck && bestValue <= ss->staticEval - 108)
+ 153 * (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 76));
int bonus = (138 * (depth > 5) + 58 * (PvNode || cutNode) + 160 * ((ss - 1)->moveCount > 8)
+ 84 * (!ss->inCheck && bestValue <= ss->staticEval - 108)
+ 153 * (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 76)
+ 32 * (!(ss - 1)->inCheck && bestValue > -(ss - 1)->staticEval + 76));
// Proportional to "how much damage we have to undo"
bonus += std::clamp(-(ss - 1)->statScore / 100, -50, 274);
bonus += std::clamp(-(ss - 1)->statScore / 100, -64, 300);
update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
stat_bonus(depth) * bonus / 100);