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Extend nodes pre qsearch only with deep enough tt entries

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Modification of current pre qsearch extensions - allowing it only for deep enough tt entries.

Passed STC:
https://tests.stockfishchess.org/tests/view/68c954d302c43c969fe7eea5
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 35872 W: 9548 L: 9236 D: 17088
Ptnml(0-2): 101, 4075, 9295, 4341, 124

Passed LTC:
https://tests.stockfishchess.org/tests/view/68ca4e4f02c43c969fe7ef5f
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 107754 W: 27784 L: 27324 D: 52646
Ptnml(0-2): 47, 11528, 30300, 11922, 80

closes https://github.com/official-stockfish/Stockfish/pull/6324

bench: 2462792
This commit is contained in:
Michael Chaly
2025-09-28 20:56:36 +02:00
committed by Joost VandeVondele
parent 6fa42d9724
commit 4f4f78f86e
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -1260,7 +1260,7 @@ moves_loop: // When in check, search starts here
(ss + 1)->pv[0] = Move::none();
// Extend move from transposition table if we are about to dive into qsearch.
if (move == ttData.move && rootDepth > 8)
if (move == ttData.move && ttData.depth > 1 && rootDepth > 8)
newDepth = std::max(newDepth, 1);
value = -search<PV>(pos, ss + 1, -beta, -alpha, newDepth, false);