X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.h;h=3d629de1abe986d63cbf3801f7d1a421cb8006ed;hp=6032f47f6294b385847716154fe145009dfb5604;hb=f0f6da2d30fc005fd0fa126ee1eefd11fe10a604;hpb=62937d1007e0f97e629f376adca4f4ad738e95d1

diff --git a/src/bitboard.h b/src/bitboard.h
index 6032f47f..3d629de1 100644
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -165,8 +165,9 @@ constexpr Bitboard make_bitboard(Square s, Squares... squares) {
 template<Direction D>
 constexpr Bitboard shift(Bitboard b) {
   return  D == NORTH      ?  b             << 8 : D == SOUTH      ?  b             >> 8
-        : D == NORTH_EAST ? (b & ~FileHBB) << 9 : D == SOUTH_EAST ? (b & ~FileHBB) >> 7
-        : D == NORTH_WEST ? (b & ~FileABB) << 7 : D == SOUTH_WEST ? (b & ~FileABB) >> 9
+        : D == EAST       ? (b & ~FileHBB) << 1 : D == WEST       ? (b & ~FileABB) >> 1
+        : D == NORTH_EAST ? (b & ~FileHBB) << 9 : D == NORTH_WEST ? (b & ~FileABB) << 7 
+        : D == SOUTH_EAST ? (b & ~FileHBB) >> 7 : D == SOUTH_WEST ? (b & ~FileABB) >> 9
         : 0;
 }