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Avoid changing bestvalue

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in the case the ttValue contains mate scores, do not return them as bestValue, since they are not proven.

passed STC
https://tests.stockfishchess.org/tests/view/665b1ea5586058766677cfa3
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 58912 W: 15319 L: 15130 D: 28463
Ptnml(0-2): 141, 6562, 15854, 6765, 134

passed LTC:
https://tests.stockfishchess.org/tests/view/665b2712586058766677cfc4
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 141666 W: 35976 L: 35879 D: 69811
Ptnml(0-2): 61, 15513, 39584, 15618, 57

closes https://github.com/official-stockfish/Stockfish/pull/5335

Bench: 1336115
This commit is contained in:
Joost VandeVondele 2024-06-01 15:13:41 +02:00
parent 783dfc2eb2
commit b0870cf528
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1495,7 +1495,7 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
to_corrected_static_eval(unadjustedStaticEval, *thisThread, pos);
// ttValue can be used as a better position evaluation (~13 Elo)
if (ttValue != VALUE_NONE
if (std::abs(ttValue) < VALUE_TB_WIN_IN_MAX_PLY
&& (tte->bound() & (ttValue > bestValue ? BOUND_LOWER : BOUND_UPPER)))
bestValue = ttValue;
}