Delay castling legality check

[stockfish] / src / position.h

diff --git a/src/position.h b/src/position.h
index d94ef185ac9c45a47de27148ce34f8dfe0ff3685..74173d03bc9004f75243177a45def93a57b81ade 100644 (file)
--- a/src/position.h
+++ b/src/position.h
@@ -265,7 +265,7 @@ inline bool Position::can_castle(CastlingRight cr) const {
 }
 
 inline int Position::castling_rights(Color c) const {
-  return st->castlingRights & ((WHITE_OO | WHITE_OOO) << (2 * c));
+  return st->castlingRights & (c == WHITE ? WHITE_CASTLING : BLACK_CASTLING);
 }
 
 inline bool Position::castling_impeded(CastlingRight cr) const {