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Simplify check extension

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Simplify check extension, as it seems not to bring any strength and thus is no longer needed.

STC https://tests.stockfishchess.org/tests/view/608c18e995e7f1852abd2b81
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 54544 W: 4891 L: 4815 D: 44838
Ptnml(0-2): 186, 3889, 19081, 3895, 221

LTC https://tests.stockfishchess.org/tests/view/608c6ab195e7f1852abd2bc6
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 51008 W: 1845 L: 1794 D: 47369
Ptnml(0-2): 31, 1591, 22206, 1648, 28

closes https://github.com/official-stockfish/Stockfish/pull/3452

bench: 3993071
This commit is contained in:
Unai Corzo 2021-05-01 10:18:57 +02:00 • committed by Joost VandeVondele
parent 33fadb5118
commit b1c8840f10
2 changed files with 0 additions and 10 deletions
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5
src/position.h
View file

@ -115,7 +115,6 @@ public:
Bitboard blockers_for_king(Color c) const;
Bitboard check_squares(PieceType pt) const;
Bitboard pinners(Color c) const;
bool is_discovered_check_on_king(Color c, Move m) const;
// Attacks to/from a given square
Bitboard attackers_to(Square s) const;
@ -301,10 +300,6 @@ inline Bitboard Position::check_squares(PieceType pt) const {
return st->checkSquares[pt];
}
inline bool Position::is_discovered_check_on_king(Color c, Move m) const {
return st->blockersForKing[c] & from_sq(m);
}
inline bool Position::pawn_passed(Color c, Square s) const {
return !(pieces(~c, PAWN) & passed_pawn_span(c, s));
}

5
src/search.cpp
View file

@ -1155,11 +1155,6 @@ moves_loop: // When in check, search starts from here
}
}
// Check extension (~2 Elo)
else if ( givesCheck
&& (pos.is_discovered_check_on_king(~us, move) || pos.see_ge(move)))
extension = 1;
// Add extension to new depth
newDepth += extension;