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Decrease probCutBeta based on opponentWorsening

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Passed STC:
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 62112 W: 16305 L: 15947 D: 29860
Ptnml(0-2): 203, 7226, 15856, 7552, 219
https://tests.stockfishchess.org/tests/view/66f85fc986d5ee47d953b71e

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 129552 W: 33223 L: 32710 D: 63619
Ptnml(0-2): 94, 14250, 35573, 14767, 92
https://tests.stockfishchess.org/tests/view/66f93fef86d5ee47d953b7d2

closes https://github.com/official-stockfish/Stockfish/pull/5615

bench: 1511354
This commit is contained in:
Taras Vuk 2024-10-02 15:55:59 +02:00 • committed by Joost VandeVondele
parent 7ac745a736
commit 81c1d31084
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -840,7 +840,7 @@ Value Search::Worker::search(
// Step 11. ProbCut (~10 Elo) // Step 11. ProbCut (~10 Elo)
// If we have a good enough capture (or queen promotion) and a reduced search // If we have a good enough capture (or queen promotion) and a reduced search
// returns a value much above beta, we can (almost) safely prune the previous move. // returns a value much above beta, we can (almost) safely prune the previous move.
probCutBeta = beta + 189 - 53 * improving; probCutBeta = beta + 189 - 53 * improving - 30 * opponentWorsening;
if (!PvNode && depth > 3 if (!PvNode && depth > 3
&& std::abs(beta) < VALUE_TB_WIN_IN_MAX_PLY && std::abs(beta) < VALUE_TB_WIN_IN_MAX_PLY
// If value from transposition table is lower than probCutBeta, don't attempt // If value from transposition table is lower than probCutBeta, don't attempt