Better condition in is_pseudo_legal()

Simplify occupied destination condition.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

diff --git a/src/position.cpp b/src/position.cpp
index 55f8bcf..f7a89e0 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -542,7 +542,7 @@ bool Position::is_pseudo_legal(const Move m) const {
       return false;
 
   // The destination square cannot be occupied by a friendly piece
-  if (piece_on(to) != NO_PIECE && color_of(piece_on(to)) == us)
+  if (pieces(us) & to)
       return false;
 
   // Handle the special case of a pawn move