Remove semiopenFiles in pawns and simplify space #2102

[stockfish] / src / position.h

diff --git a/src/position.h b/src/position.h
index ce13017dd0e5ab4389f2ba19d7d86c96b0a38871..1351d0d125a6b60a4d14d78aaf071af638417b92 100644 (file)
--- a/src/position.h
+++ b/src/position.h
@@ -95,6 +95,7 @@ public:
   template<PieceType Pt> int count() const;
   template<PieceType Pt> const Square* squares(Color c) const;
   template<PieceType Pt> Square square(Color c) const;
+  int semiopen_file(Color c, File f) const;
 
   // Castling
   int castling_rights(Color c) const;
@@ -260,6 +261,10 @@ inline Square Position::ep_square() const {
   return st->epSquare;
 }
 
+inline int Position::semiopen_file(Color c, File f) const {
+  return !(pieces(c, PAWN) & file_bb(f));
+}
+
 inline bool Position::can_castle(CastlingRight cr) const {
   return st->castlingRights & cr;
 }
@@ -413,7 +418,7 @@ 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;