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Decrease delta

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Decrease delta in aspiration windows - both initial value and quadratic
function of previous best value.

Passed STC:
https://tests.stockfishchess.org/tests/view/6691a52ec6827afcdcee1569
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 55456 W: 14449 L: 14107 D: 26900
Ptnml(0-2): 174, 6416, 14193, 6784, 161

Passed LTC:
https://tests.stockfishchess.org/tests/view/6691aac1c6827afcdcee1625
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 107940 W: 27530 L: 27065 D: 53345
Ptnml(0-2): 52, 11787, 29840, 12226, 65

closes https://github.com/official-stockfish/Stockfish/pull/5479

bench 1547707
This commit is contained in:
Michael Chaly
2024-07-15 13:22:31 +02:00
committed by Joost VandeVondele
parent 563d268519
commit 930915de90
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -320,7 +320,7 @@ void Search::Worker::iterative_deepening() {
// Reset aspiration window starting size // Reset aspiration window starting size
Value avg = rootMoves[pvIdx].averageScore; Value avg = rootMoves[pvIdx].averageScore;
delta = 9 + avg * avg / 10424; delta = 5 + avg * avg / 13424;
alpha = std::max(avg - delta, -VALUE_INFINITE); alpha = std::max(avg - delta, -VALUE_INFINITE);
beta = std::min(avg + delta, VALUE_INFINITE); beta = std::min(avg + delta, VALUE_INFINITE);