Improve history updates.
If a search failed low at an expected PV or CUT node do greater history updates. STC: LLR: 2.94 (-2.94,2.94) <-0.50,2.50> Total: 95112 W: 24293 L: 23982 D: 46837 Ptnml(0-2): 285, 10893, 24906, 11170, 302 https://tests.stockfishchess.org/tests/view/6132aa1a2ffb3c36aceb926f LTC: LLR: 2.94 (-2.94,2.94) <0.50,3.50> Total: 116352 W: 29450 L: 28975 D: 57927 Ptnml(0-2): 93, 12263, 32984, 12748, 88 https://tests.stockfishchess.org/tests/view/613394d12ffb3c36aceb92f4 Bench: 5348574pull/3693/head
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@ -1317,7 +1317,7 @@ moves_loop: // When in check, search starts here
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// Bonus for prior countermove that caused the fail low
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else if ( (depth >= 3 || PvNode)
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&& !priorCapture)
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update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, stat_bonus(depth));
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update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, stat_bonus(depth + (PvNode || cutNode)));
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if (PvNode)
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bestValue = std::min(bestValue, maxValue);
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