X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fposition.h;h=a3fb16b8e6c2c871a6e9ac3ab5ca3e11d36f9863;hb=5f4d44fda053335ab20cb67c99323b8c182bf824;hp=ce13017dd0e5ab4389f2ba19d7d86c96b0a38871;hpb=796d0ad70eaadf1a354d6565181331c981432f2d;p=stockfish

diff --git a/src/position.h b/src/position.h
index ce13017d..a3fb16b8 100644
--- 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;
+  bool is_semiopen_file(Color c, File f) const;
 
   // Castling
   int castling_rights(Color c) const;
@@ -128,6 +129,7 @@ public:
   // Piece specific
   bool pawn_passed(Color c, Square s) const;
   bool opposite_bishops() const;
+  int  pawns_on_same_color_squares(Color c, Square s) const;
 
   // Doing and undoing moves
   void do_move(Move m, StateInfo& newSt);
@@ -260,6 +262,10 @@ inline Square Position::ep_square() const {
   return st->epSquare;
 }
 
+inline bool Position::is_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;
 }
@@ -315,7 +321,11 @@ inline bool Position::pawn_passed(Color c, Square s) const {
 
 inline bool Position::advanced_pawn_push(Move m) const {
   return   type_of(moved_piece(m)) == PAWN
-        && relative_rank(sideToMove, from_sq(m)) > RANK_4;
+        && relative_rank(sideToMove, to_sq(m)) > RANK_5;
+}
+
+inline int Position::pawns_on_same_color_squares(Color c, Square s) const {
+  return popcount(pieces(c, PAWN) & ((DarkSquares & s) ? DarkSquares : ~DarkSquares));
 }
 
 inline Key Position::key() const {
@@ -413,7 +423,7 @@ 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;