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Negative extension for ttMove that is less than alpha and value

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in the context of singular extensions

Passed STC:
https://tests.stockfishchess.org/tests/view/626047e8b03f22647441ade0
LLR: 2.97 (-2.94,2.94) <0.00,2.50>
Total: 50296 W: 13410 L: 13108 D: 23778
Ptnml(0-2): 196, 5548, 13370, 5826, 208

Passed LTC:
https://tests.stockfishchess.org/tests/view/6260a513b03f22647441b970
LLR: 2.96 (-2.94,2.94) <0.50,3.00>
Total: 83896 W: 22433 L: 22054 D: 39409
Ptnml(0-2): 49, 8273, 24938, 8626, 62

closes https://github.com/official-stockfish/Stockfish/pull/3995

bench: 7729968
This commit is contained in:
candirufish 2022-04-22 08:03:50 +02:00 • committed by Joost VandeVondele
parent e41f727f0f
commit e1f12aa4e6
1 changed files with 4 additions and 0 deletions
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4
src/search.cpp
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@ -1098,6 +1098,10 @@ moves_loop: // When in check, search starts here
// If the eval of ttMove is greater than beta, we reduce it (negative extension)
else if (ttValue >= beta)
extension = -2;
// If the eval of ttMove is less than alpha and value, we reduce it (negative extension)
else if (ttValue <= alpha && ttValue <= value)
extension = -1;
}
// Check extensions (~1 Elo)