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Extend discovered checks regardless of SEE
A simple idea, but it makes sense: in current master the search is extended for checks that are considered somewhat safe, and for for this we use the static exchange evaluation which only considers the `to_sq` of a move. This is not reliable for discovered checks, where another piece is giving the check and is arguably a more dangerous type of check. Thus, if the check is a discovered check, the result of SEE is not relevant and can be ignored. STC: LLR: 2.96 (-2.94,2.94) [0.50,4.50] Total: 29370 W: 6583 L: 6274 D: 16513 http://tests.stockfishchess.org/tests/view/5c5062950ebc593af5d4d9b5 LTC: LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 227341 W: 37972 L: 37165 D: 152204 http://tests.stockfishchess.org/tests/view/5c5094fb0ebc593af5d4dc2c Bench: 3611854
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1 changed files with 5 additions and 3 deletions
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@ -953,11 +953,13 @@ moves_loop: // When in check, search starts from here
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else if (cutNode && singularBeta > beta)
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return beta;
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}
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else if ( givesCheck // Check extension (~2 Elo)
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&& pos.see_ge(move))
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// Check extension (~2 Elo)
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else if ( givesCheck
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&& (pos.blockers_for_king(~us) & from_sq(move) || pos.see_ge(move)))
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extension = ONE_PLY;
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// Extension if castling
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// Castling extension
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else if (type_of(move) == CASTLING)
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extension = ONE_PLY;
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