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Adjust probcut on staticEval

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Reducing probcut depth more when staticEval is very good and less if staticEval is not so good compared to beta

STC: https://tests.stockfishchess.org/tests/view/68926bf6690844f940fa1350
LLR: 2.98 (-2.94,2.94) <0.00,2.00>
Total: 174400 W: 45698 L: 45174 D: 83528
Ptnml(0-2): 622, 20356, 44672, 20976, 574

LTC: https://tests.stockfishchess.org/tests/view/689651b4f8a258623dda6531
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 56010 W: 14547 L: 14191 D: 27272
Ptnml(0-2): 31, 5929, 15738, 6267, 40

This patch was generated using qwen3-235b-a22b-thinking-2507:

Prompt: https://rentry.co/bm6vriai
Thinking: https://rentry.co/34km4zf8
Final respone: https://rentry.co/rauotrvr

closes https://github.com/official-stockfish/Stockfish/pull/6219

Bench: 3629755
This commit is contained in:
Jost Triller
2025-08-09 09:08:38 +02:00
committed by Joost VandeVondele
parent ade8917447
commit 7a07ac0e76
1 changed files with 2 additions and 1 deletions
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src/search.cpp
+2 -1
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@@ -914,7 +914,8 @@ Value Search::Worker::search(
assert(probCutBeta < VALUE_INFINITE && probCutBeta > beta); assert(probCutBeta < VALUE_INFINITE && probCutBeta > beta);
MovePicker mp(pos, ttData.move, probCutBeta - ss->staticEval, &captureHistory); MovePicker mp(pos, ttData.move, probCutBeta - ss->staticEval, &captureHistory);
Depth probCutDepth = std::max(depth - 5, 0); Depth dynamicReduction = (ss->staticEval - beta) / 300;
Depth probCutDepth = std::max(depth - 5 - dynamicReduction, 0);
while ((move = mp.next_move()) != Move::none()) while ((move = mp.next_move()) != Move::none())
{ {