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Remove penalty for quiet ttMove that fails low
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
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1 changed files with 0 additions and 7 deletions
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@ -621,13 +621,6 @@ Value Search::Worker::search(
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update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
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-stat_malus(depth + 1));
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}
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// Penalty for a quiet ttMove that fails low (~1 Elo)
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else if (!ttCapture)
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{
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int penalty = -stat_malus(depth);
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thisThread->mainHistory[us][ttMove.from_to()] << penalty;
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update_continuation_histories(ss, pos.moved_piece(ttMove), ttMove.to_sq(), penalty);
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}
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}
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// Partial workaround for the graph history interaction problem
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