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Remove penalty for quiet ttMove that fails low

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Passed STC non-reg:
https://tests.stockfishchess.org/tests/view/65c691a7c865510db0286e6e
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 234336 W: 60258 L: 60255 D: 113823
Ptnml(0-2): 966, 28141, 58918, 28210, 933

Passed LTC non-reg:
https://tests.stockfishchess.org/tests/view/65c8d0d31d8e83c78bfcd4a6
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 235206 W: 59134 L: 59132 D: 116940
Ptnml(0-2): 135, 26908, 63517, 26906, 137

https://github.com/official-stockfish/Stockfish/pull/5054

Bench: 1287996
This commit is contained in:
Gahtan Nahdi 2024-02-10 03:51:05 +07:00 • committed by Disservin
parent bf2c7306ac
commit 9d61822b5d
1 changed files with 0 additions and 7 deletions
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7
src/search.cpp
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@ -621,13 +621,6 @@ Value Search::Worker::search(
update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
-stat_malus(depth + 1));
}
// Penalty for a quiet ttMove that fails low (~1 Elo)
else if (!ttCapture)
{
int penalty = -stat_malus(depth);
thisThread->mainHistory[us][ttMove.from_to()] << penalty;
update_continuation_histories(ss, pos.moved_piece(ttMove), ttMove.to_sq(), penalty);
}
}
// Partial workaround for the graph history interaction problem