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b742746)
A pawn push is now considered to be "advanced" if the relative destination
rank is > 6 (previously it was > 5). This affects the search heuristic.
Also remove an assert concerning en passant moves in qsearch().
STC:
LLR: 2.97 (-2.94,2.94) {-0.25,1.25}
Total: 46744 W: 4224 L: 4040 D: 38480
Ptnml(0-2): 165, 3206, 16451, 3380, 170
https://tests.stockfishchess.org/tests/view/
604746082433018de7a3872e
LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 107840 W: 4198 L: 3892 D: 99750
Ptnml(0-2): 58, 3472, 46557, 3772, 61
https://tests.stockfishchess.org/tests/view/
60475eae2433018de7a38737
Closes https://github.com/official-stockfish/Stockfish/pull/3389
Bench:
4796780
sf-x
Shane Booth (shane31)
Shawn Varghese (xXH4CKST3RXx)
sf-x
Shane Booth (shane31)
Shawn Varghese (xXH4CKST3RXx)
+Siad Daboul (Topologist)
Stefan Geschwentner (locutus2)
Stefano Cardanobile (Stefano80)
Steinar Gunderson (sesse)
Stefan Geschwentner (locutus2)
Stefano Cardanobile (Stefano80)
Steinar Gunderson (sesse)
inline bool Position::advanced_pawn_push(Move m) const {
return type_of(moved_piece(m)) == PAWN
inline bool Position::advanced_pawn_push(Move m) const {
return type_of(moved_piece(m)) == PAWN
- && relative_rank(sideToMove, to_sq(m)) > RANK_5;
+ && relative_rank(sideToMove, to_sq(m)) > RANK_6;
}
inline int Position::pawns_on_same_color_squares(Color c, Square s) const {
}
inline int Position::pawns_on_same_color_squares(Color c, Square s) const {
+ // Futility pruning and moveCount pruning
if ( bestValue > VALUE_TB_LOSS_IN_MAX_PLY
&& !givesCheck
&& futilityBase > -VALUE_KNOWN_WIN
&& !pos.advanced_pawn_push(move))
{
if ( bestValue > VALUE_TB_LOSS_IN_MAX_PLY
&& !givesCheck
&& futilityBase > -VALUE_KNOWN_WIN
&& !pos.advanced_pawn_push(move))
{
- assert(type_of(move) != EN_PASSANT); // Due to !pos.advanced_pawn_push
if (moveCount > 2)
continue;
if (moveCount > 2)
continue;