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Broader condition for dangerous pawn moves

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Instead of a passed pawn now we just require the pawn to
be in the opponent camp to be considered a dangerous
move. Added some renaming to reflect the change.

Passed both short TC test
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 10358 W: 2033 L: 1900 D: 6425

And long TC
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 21459 W: 3486 L: 3286 D: 14687

bench: 8322172
This commit is contained in:
Chris Caino 2013-12-03 21:58:39 +00:00 • committed by Marco Costalba
parent 2408243cf4
commit 69a14554ee
3 changed files with 7 additions and 8 deletions
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2
src/bitboard.h
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@ -84,6 +84,8 @@ extern Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
extern int SquareDistance[SQUARE_NB][SQUARE_NB];
const Bitboard DarkSquares = 0xAA55AA55AA55AA55ULL;
const Bitboard TheirHalf[COLOR_NB] = { Rank5BB | Rank6BB | Rank7BB | Rank8BB,
Rank1BB | Rank2BB | Rank3BB | Rank4BB };
/// Overloads of bitwise operators between a Bitboard and a Square for testing
/// whether a given bit is set in a bitboard, and for setting and clearing bits.

8
src/position.h
View file

@ -123,7 +123,7 @@ public:
bool capture(Move m) const;
bool capture_or_promotion(Move m) const;
bool gives_check(Move m, const CheckInfo& ci) const;
bool passed_pawn_push(Move m) const;
bool advanced_pawn_push(Move m) const;
Piece moved_piece(Move m) const;
PieceType captured_piece_type() const;
@ -326,10 +326,8 @@ inline bool Position::pawn_passed(Color c, Square s) const {
return !(pieces(~c, PAWN) & passed_pawn_mask(c, s));
}
inline bool Position::passed_pawn_push(Move m) const {
return type_of(moved_piece(m)) == PAWN
&& pawn_passed(sideToMove, to_sq(m));
inline bool Position::advanced_pawn_push(Move m) const {
return pieces(PAWN) & TheirHalf[sideToMove] & from_sq(m);
}
inline Key Position::key() const {

5
src/search.cpp
View file

@ -807,7 +807,7 @@ moves_loop: // When in check and at SpNode search starts from here
captureOrPromotion = pos.capture_or_promotion(move);
givesCheck = pos.gives_check(move, ci);
dangerous = givesCheck
|| pos.passed_pawn_push(move)
|| pos.advanced_pawn_push(move)
|| type_of(move) == CASTLING;
// Step 12. Extend checks
@ -1207,9 +1207,8 @@ moves_loop: // When in check and at SpNode search starts from here
&& !InCheck
&& !givesCheck
&& move != ttMove
&& type_of(move) != PROMOTION
&& futilityBase > -VALUE_KNOWN_WIN
&& !pos.passed_pawn_push(move))
&& !pos.advanced_pawn_push(move))
{
futilityValue = futilityBase
+ PieceValue[EG][pos.piece_on(to_sq(move))]