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Don't store stand pat return value in TT

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Passed non-regression STC:
https://tests.stockfishchess.org/tests/view/69d2d3de61a12cebe17ede38
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 68384 W: 17646 L: 17459 D: 33279
Ptnml(0-2): 200, 8058, 17496, 8231, 207

Passed non-regression LTC:
https://tests.stockfishchess.org/tests/view/69d4293433584dad27b3c8cb
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 37290 W: 9582 L: 9380 D: 18328
Ptnml(0-2): 18, 3915, 10579, 4113, 20

closes https://github.com/official-stockfish/Stockfish/pull/6711

Bench: 2923401
This commit is contained in:
Linmiao Xu
2026-04-09 21:56:05 +02:00
committed by Disservin
parent 9db77822bd
commit bb4eb04a50
1 changed files with 2 additions and 3 deletions
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src/search.cpp
+2 -3
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@@ -1608,9 +1608,8 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta)
bestValue = (bestValue + beta) / 2;
if (!ss->ttHit)
ttWriter.write(posKey, value_to_tt(bestValue, ss->ply), false, BOUND_LOWER,
DEPTH_UNSEARCHED, Move::none(), unadjustedStaticEval,
tt.generation());
ttWriter.write(posKey, VALUE_NONE, false, BOUND_LOWER, DEPTH_UNSEARCHED,
Move::none(), unadjustedStaticEval, tt.generation());
return bestValue;
}