X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fbitboard.h;h=6239953e9de2c245c2c866a8a2a5665569c23e54;hb=9da1f45b1d310fbe213a7f51916e098fba837a9a;hp=bff9846c5eb9d730a4a3e5a0ddd6c67e4d2cfc59;hpb=6080fecf9cba9ac063f8f07bd25004c14016bd33;p=stockfish

diff --git a/src/bitboard.h b/src/bitboard.h
index bff9846c..6239953e 100644
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -67,7 +67,6 @@ extern Bitboard SetMaskBB[65];
 extern Bitboard ClearMaskBB[65];
 
 extern Bitboard StepAttackBB[16][64];
-extern Bitboard RayBB[64][8];
 extern Bitboard BetweenBB[64][64];
 
 extern Bitboard SquaresInFrontMask[2][64];
@@ -208,14 +207,6 @@ inline Bitboard behind_bb(Color c, Square s) {
 }
 
 
-/// ray_bb() gives a bitboard representing all squares along the ray in a
-/// given direction from a given square.
-
-inline Bitboard ray_bb(Square s, SignedDirection d) {
-  return RayBB[s][d];
-}
-
-
 /// Functions for computing sliding attack bitboards. rook_attacks_bb(),
 /// bishop_attacks_bb() and queen_attacks_bb() all take a square and a
 /// bitboard of occupied squares as input, and return a bitboard representing
@@ -306,6 +297,15 @@ inline Bitboard attack_span_mask(Color c, Square s) {
 }
 
 
+/// squares_aligned returns true if the squares s1, s2 and s3 are aligned
+/// either on a straight or on a diagonal line.
+
+inline bool squares_aligned(Square s1, Square s2, Square s3) {
+  return  (BetweenBB[s1][s2] | BetweenBB[s1][s3] | BetweenBB[s2][s3])
+        & ((1ULL << s1) | (1ULL << s2) | (1ULL << s3));
+}
+
+
 /// first_1() finds the least significant nonzero bit in a nonzero bitboard.
 /// pop_1st_bit() finds and clears the least significant nonzero bit in a
 /// nonzero bitboard.