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Penalty to TT move history on MultiCut

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If a reduced search fails high with the TT move excluded, we know that
there are multiple moves that can produce cutoffs. Applying a  penalty
to the TT move history reduces extensions for TT moves so that it may
spend a bit more time exploring other moves.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 263680 W: 68965 L: 68313 D: 126402
Ptnml(0-2): 855, 31090, 67336, 31666, 893
https://tests.stockfishchess.org/tests/view/68c1f65a59efc3c96b6110e5

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 61008 W: 15713 L: 15350 D: 29945
Ptnml(0-2): 27, 6428, 17235, 6783, 31
https://tests.stockfishchess.org/tests/view/68c1fc5359efc3c96b611141

Passed non-regression VLTC (60+0.6, Threads=8):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 50340 W: 13003 L: 12830 D: 24507
Ptnml(0-2): 3, 4570, 15849, 4747, 1
https://tests.stockfishchess.org/tests/view/68c2056559efc3c96b6111c3

closes https://github.com/official-stockfish/Stockfish/pull/6305

Bench: 2342975
This commit is contained in:
Syine Mineta
2025-09-28 20:49:24 +02:00
committed by Joost VandeVondele
parent a82e2a4cb6
commit a47a1c1804
1 changed files with 3 additions and 0 deletions
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src/search.cpp
+3
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@@ -1137,7 +1137,10 @@ moves_loop: // When in check, search starts here
// singular (multiple moves fail high), and we can prune the whole // singular (multiple moves fail high), and we can prune the whole
// subtree by returning a softbound. // subtree by returning a softbound.
else if (value >= beta && !is_decisive(value)) else if (value >= beta && !is_decisive(value))
{
ttMoveHistory << std::max(-400 - 100 * depth, -4000);
return value; return value;
}
// Negative extensions // Negative extensions
// If other moves failed high over (ttValue - margin) without the // If other moves failed high over (ttValue - margin) without the