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limit dynamic reduction.

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fixes https://github.com/official-stockfish/Stockfish/issues/6280

prevents probcut from extending depth as analyzed here:
https://github.com/official-stockfish/Stockfish/pull/6254#issuecomment-3239144280

passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 86688 W: 22591 L: 22426 D: 41671
Ptnml(0-2): 305, 10125, 22311, 10306, 297
https://tests.stockfishchess.org/tests/view/68b418ab467ff96994ae4cd5

passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 82914 W: 21287 L: 21130 D: 40497
Ptnml(0-2): 39, 8959, 23305, 9114, 40
https://tests.stockfishchess.org/tests/view/68b47ffa78ed7a752a9e8f36

closes https://github.com/official-stockfish/Stockfish/pull/6286

Bench: 2787731

Co-Authored-By: xu-shawn <50402888+xu-shawn@users.noreply.github.com>
This commit is contained in:
Joost VandeVondele
2025-09-02 20:34:47 +02:00
co-authored by xu-shawn
parent 731ad9bbc3
commit 3833583862
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -917,7 +917,7 @@ 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 dynamicReduction = (ss->staticEval - beta) / 306; Depth dynamicReduction = std::max((ss->staticEval - beta) / 306, -1);
Depth probCutDepth = std::max(depth - 5 - dynamicReduction, 0); Depth probCutDepth = std::max(depth - 5 - dynamicReduction, 0);
while ((move = mp.next_move()) != Move::none()) while ((move = mp.next_move()) != Move::none())