Use special null move technique in low depth.

[stockfish] / src / position.h

diff --git a/src/position.h b/src/position.h
index 5fe1a8fdddae4dd6a85858d21dac2f4ada97b759..d1d511d7a99501245b5633ba76febe65ac9f000c 100644 (file)
--- a/src/position.h
+++ b/src/position.h
@@ -236,10 +236,7 @@ public:
   bool move_is_check(Move m) const;
   bool move_is_check(Move m, Bitboard dcCandidates) const;
   bool move_is_capture(Move m) const;
-  bool move_is_deep_pawn_push(Move m) const;
-  bool move_is_pawn_push_to_7th(Move m) const;
   bool move_is_passed_pawn_push(Move m) const;
-  bool move_was_passed_pawn_push(Move m) const;
   bool move_attacks_square(Move m, Square s) const;
 
   // Information about pawns
@@ -248,10 +245,6 @@ public:
   static bool pawn_is_isolated(Bitboard ourPawns, Square s);
   static bool pawn_is_doubled(Bitboard ourPawns, Color c, Square s);
 
-  // Open and half-open files
-  static bool file_is_open(Bitboard pawns, File f);
-  static bool file_is_half_open(Bitboard pawns, File f);
-
   // Weak squares
   bool square_is_weak(Square s, Color c) const;
 
@@ -267,6 +260,7 @@ public:
   int see(Square from, Square to) const;
   int see(Move m) const;
   int see(Square to) const;
+  int see_sign(Move m) const;
 
   // Accessing hash keys
   Key get_key() const;
@@ -313,13 +307,9 @@ private:
   void allow_ooo(Color c);
 
   // Helper functions for doing and undoing moves
-  void do_capture_move(PieceType capture, Color them, Square to);
+  void do_capture_move(Bitboard& key, PieceType capture, Color them, Square to, bool ep);
   void do_castle_move(Move m);
-  void do_promotion_move(Move m);
-  void do_ep_move(Move m);
   void undo_castle_move(Move m);
-  void undo_promotion_move(Move m);
-  void undo_ep_move(Move m);
   void find_checkers();
 
   template<PieceType Piece>
@@ -349,7 +339,7 @@ private:
 
   // Piece lists
   Square pieceList[2][8][16]; // [color][pieceType][index]
-  int index[64];
+  int index[64]; // [square]
 
   // Other info
   Square kingSquare[2];
@@ -604,14 +594,6 @@ inline bool Position::pawn_is_doubled(Bitboard ourPawns, Color c, Square s) {
   return ourPawns & squares_behind(c, s);
 }
 
-inline bool Position::file_is_open(Bitboard pawns, File f) {
-  return !(pawns & file_bb(f));
-}
-
-inline bool Position::file_is_half_open(Bitboard pawns, File f) {
-  return !(pawns & file_bb(f));
-}
-
 inline bool Position::square_is_weak(Square s, Color c) const {
   return !(pawns(c) & outpost_mask(opposite_color(c), s));
 }
@@ -668,20 +650,6 @@ inline Phase Position::game_phase() const {
       return Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
 }
 
-inline bool Position::move_is_deep_pawn_push(Move m) const {
-
-  Color c = side_to_move();
-  return   piece_on(move_from(m)) == piece_of_color_and_type(c, PAWN)
-        && relative_rank(c, move_to(m)) > RANK_4;
-}
-
-inline bool Position::move_is_pawn_push_to_7th(Move m) const {
-
-  Color c = side_to_move();
-  return   piece_on(move_from(m)) == piece_of_color_and_type(c, PAWN)
-        && relative_rank(c, move_to(m)) == RANK_7;
-}
-
 inline bool Position::move_is_passed_pawn_push(Move m) const {
 
   Color c = side_to_move();
@@ -689,13 +657,6 @@ inline bool Position::move_is_passed_pawn_push(Move m) const {
         && pawn_is_passed(c, move_to(m));
 }
 
-inline bool Position::move_was_passed_pawn_push(Move m) const {
-
-  Color c = opposite_color(side_to_move());
-  return   piece_on(move_to(m)) == piece_of_color_and_type(c, PAWN)
-        && pawn_is_passed(c, move_to(m));
-}
-
 inline int Position::rule_50_counter() const {
 
   return st->rule50;