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Bigger thread dependent initial window.

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Increase the initial delta of the aspiration window  by "thread id mod 8".

Passed SMP STC:
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 106176 W: 27470 L: 27069 D: 51637
Ptnml(0-2): 121, 12032, 28386, 12423, 126
https://tests.stockfishchess.org/tests/view/68a178fab6fb3300203bbaec

Passed SMP LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 133076 W: 34272 L: 33772 D: 65032
Ptnml(0-2): 38, 13709, 38537, 14223, 31
https://tests.stockfishchess.org/tests/view/68a1b5d2b6fb3300203bbb71

closes https://github.com/official-stockfish/Stockfish/pull/6239

No functional change
This commit is contained in:
Stefan Geschwentner
2025-08-17 22:39:49 +02:00
committed by Joost VandeVondele
parent 2176c9387e
commit 8ecfc3c89d
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -322,7 +322,7 @@ void Search::Worker::iterative_deepening() {
selDepth = 0;
// Reset aspiration window starting size
delta = 5 + std::abs(rootMoves[pvIdx].meanSquaredScore) / 11131;
delta = 5 + threadIdx % 8 + std::abs(rootMoves[pvIdx].meanSquaredScore) / 11131;
Value avg = rootMoves[pvIdx].averageScore;
alpha = std::max(avg - delta, -VALUE_INFINITE);
beta = std::min(avg + delta, VALUE_INFINITE);