Small cleanup in execute_uci_command()

[stockfish] / src / bitboard.h

diff --git a/src/bitboard.h b/src/bitboard.h
index b8eb3220a776b026a890d031af7e6db7368fac69..42c096d1992ad50d82c78dfaa11b993dd624f57c 100644 (file)
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -66,7 +66,7 @@ extern const Bitboard InFrontBB[2][8];
 extern Bitboard SetMaskBB[65];
 extern Bitboard ClearMaskBB[65];
 
-extern Bitboard StepAttackBB[16][64];
+extern Bitboard NonSlidingAttacksBB[16][64];
 extern Bitboard BetweenBB[64][64];
 
 extern Bitboard SquaresInFrontMask[2][64];
@@ -297,6 +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.