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Less pruning in qsearch

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do not prune moves that give discovery checks, even if with negative SSE.

STC https://tests.stockfishchess.org/tests/view/5f4cb5e8ba100690c5cc5d25
LLR: 2.96 (-2.94,2.94) {-0.25,1.25}
Total: 91328 W: 9940 L: 9667 D: 71721
Ptnml(0-2): 491, 7345, 29693, 7670, 465

LTC https://tests.stockfishchess.org/tests/view/5f4dbc2eba100690c5cc5dac
LLR: 2.97 (-2.94,2.94) {0.25,1.25}
Total: 52448 W: 2799 L: 2586 D: 47063
Ptnml(0-2): 53, 2220, 21459, 2445, 47

closes https://github.com/official-stockfish/Stockfish/pull/3098

bench: 4031192
This commit is contained in:
Unai Corzo
2020-09-02 16:45:49 +02:00
committed by Joost VandeVondele
parent 571c2d6d8d
commit 0e1f734b05
1 changed files with 3 additions and 1 deletions
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4
src/search.cpp
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@@ -1564,7 +1564,9 @@ moves_loop: // When in check, search starts from here
} }
// Do not search moves with negative SEE values // Do not search moves with negative SEE values
if (!ss->inCheck && !pos.see_ge(move)) if ( !ss->inCheck
&& !(givesCheck && pos.is_discovery_check_on_king(~pos.side_to_move(), move))
&& !pos.see_ge(move))
continue; continue;
// Speculative prefetch as early as possible // Speculative prefetch as early as possible