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Simplify probCutBeta formula

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After recent changes to the improving definition, seems like there is no
need anymore to keep opponentWorsening in the probCutBeta formula.

Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 214272 W: 55566 L: 55541 D: 103165
Ptnml(0-2): 620, 25540, 54817, 25513, 646
https://tests.stockfishchess.org/tests/view/6735243d86d5ee47d953eaea

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 126708 W: 32329 L: 32216 D: 62163
Ptnml(0-2): 68, 13986, 35123, 14119, 58
https://tests.stockfishchess.org/tests/view/67393cf686d5ee47d953ef99

closes https://github.com/official-stockfish/Stockfish/pull/5697

Bench: 983067
This commit is contained in:
FauziAkram 2024-11-23 14:37:08 +03:00 • committed by Disservin
parent da82942b54
commit d5a36a3c92
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -855,7 +855,7 @@ 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 + 187 - 53 * improving - 27 * opponentWorsening; probCutBeta = beta + 187 - 56 * improving;
if (!PvNode && depth > 3 if (!PvNode && depth > 3
&& !is_decisive(beta) && !is_decisive(beta)
// If value from transposition table is lower than probCutBeta, don't attempt // If value from transposition table is lower than probCutBeta, don't attempt