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Adjust usage of history in futility pruning

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This patch refines 0ac8aca893 that uses history heuristics in futility pruning.
Now it adds main history of the move to in and also increases effect by factor of 2.

passed STC
https://tests.stockfishchess.org/tests/view/61a156829e83391467a2b2c9
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 68464 W: 17920 L: 17587 D: 32957
Ptnml(0-2): 239, 7711, 18025, 7992, 265

passed LTC
https://tests.stockfishchess.org/tests/view/61a1bde99e83391467a2b305
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 26088 W: 6926 L: 6674 D: 12488
Ptnml(0-2): 18, 2619, 7531, 2845, 31

closes https://github.com/official-stockfish/Stockfish/pull/3812

bench 6804653
This commit is contained in:
Michael Chaly 2021-11-27 16:38:37 +03:00 • committed by Joost VandeVondele
parent 4bb11e823f
commit 8bb5a436b2
1 changed files with 3 additions and 1 deletions
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4
src/search.cpp
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@ -1063,10 +1063,12 @@ moves_loop: // When in check, search starts here
&& history < -3000 * depth + 3000)
continue;
history += thisThread->mainHistory[us][from_to(move)];
// Futility pruning: parent node (~5 Elo)
if ( !ss->inCheck
&& lmrDepth < 8
&& ss->staticEval + 172 + 145 * lmrDepth + history / 256 <= alpha)
&& ss->staticEval + 172 + 145 * lmrDepth + history / 128 <= alpha)
continue;
// Prune moves with negative SEE (~20 Elo)