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Revert "Adjust return bonus from tt cutoffs at fail highs"

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This reverts commit 783dfc2eb2.

could lead to a division by zero for:

ttValue = (ttValue * tte->depth() + beta) / (tte->depth() + 1)

as other threads can overwrite the tte with a QS depth of -1.

closes https://github.com/official-stockfish/Stockfish/pull/5338

Bench: 1280020
This commit is contained in:
Joost VandeVondele 2024-06-02 09:18:19 +02:00
parent c17d73c554
commit 8aaae0367c
1 changed files with 0 additions and 5 deletions
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5
src/search.cpp
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@ -640,12 +640,7 @@ Value Search::Worker::search(
// Partial workaround for the graph history interaction problem // Partial workaround for the graph history interaction problem
// For high rule50 counts don't produce transposition table cutoffs. // For high rule50 counts don't produce transposition table cutoffs.
if (pos.rule50_count() < 90) if (pos.rule50_count() < 90)
{
if (ttValue >= beta && std::abs(ttValue) < VALUE_TB_WIN_IN_MAX_PLY
&& std::abs(beta) < VALUE_TB_WIN_IN_MAX_PLY)
ttValue = (ttValue * tte->depth() + beta) / (tte->depth() + 1);
return ttValue; return ttValue;
}
} }
// Step 5. Tablebases probe // Step 5. Tablebases probe