X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fposition.h;h=03c00148a084636fbeac4370f55635890ec0c46f;hp=ce13017dd0e5ab4389f2ba19d7d86c96b0a38871;hb=ec49e676a70435472cb70a9cf0c0376dfab31af4;hpb=796d0ad70eaadf1a354d6565181331c981432f2d

diff --git a/src/position.h b/src/position.h
index ce13017d..03c00148 100644
--- a/src/position.h
+++ b/src/position.h
@@ -413,7 +413,7 @@ inline void Position::move_piece(Piece pc, Square from, Square to) {
 
   // index[from] is not updated and becomes stale. This works as long as index[]
   // is accessed just by known occupied squares.
-  Bitboard fromTo = square_bb(from) ^ square_bb(to);
+  Bitboard fromTo = square_bb(from) | square_bb(to);
   byTypeBB[ALL_PIECES] ^= fromTo;
   byTypeBB[type_of(pc)] ^= fromTo;
   byColorBB[color_of(pc)] ^= fromTo;