X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fposition.h;h=30c25652f5b2455f966cd6767d9ae5011c43b814;hp=7842ed8b337254ea5d2db61f537644056146e212;hb=34178205fc762638e633a61ecc45360e1662bdee;hpb=29be28e1a24898cec64470332740eaa54893b7a4

diff --git a/src/position.h b/src/position.h
index 7842ed8b..30c25652 100644
--- a/src/position.h
+++ b/src/position.h
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -23,20 +23,21 @@
 #include <cassert>
 
 #include "bitboard.h"
-#include "move.h"
 #include "types.h"
 
 
 /// The checkInfo struct is initialized at c'tor time and keeps info used
 /// to detect if a move gives check.
+class Position;
 
 struct CheckInfo {
 
-    explicit CheckInfo(const Position&);
+  explicit CheckInfo(const Position&);
 
-    Bitboard dcCandidates;
-    Bitboard pinned;
-    Bitboard checkSq[8];
+  Bitboard dcCandidates;
+  Bitboard pinned;
+  Bitboard checkSq[8];
+  Square ksq;
 };
 
 
@@ -44,7 +45,6 @@ struct CheckInfo {
 /// object to its previous state when we retract a move. Whenever a move
 /// is made on the board (by calling Position::do_move), an StateInfo object
 /// must be passed as a parameter.
-class Position;
 
 struct StateInfo {
   Key pawnKey, materialKey;
@@ -84,29 +84,30 @@ struct StateInfo {
 
 class Position {
 
-  // No defaul, copy c'tor or assignment allowed, default c'tor will not be
-  // generated anyhow because of user-defined c'tors.
+  // No copy c'tor or assignment operator allowed
   Position(const Position&);
   Position& operator=(const Position&);
 
 public:
-  Position(const Position& pos, int threadID);
-  Position(const std::string& fen, bool isChess960, int threadID);
+  Position() {}
+  Position(const Position& pos, int th) { copy(pos, th); }
+  Position(const std::string& fen, bool isChess960, int th);
 
   // Text input/output
+  void copy(const Position& pos, int th);
   void from_fen(const std::string& fen, bool isChess960);
   const std::string to_fen() const;
   void print(Move m = MOVE_NONE) const;
 
   // The piece on a given square
   Piece piece_on(Square s) const;
+  Piece piece_moved(Move m) const;
   bool square_is_empty(Square s) const;
 
   // Side to move
   Color side_to_move() const;
 
   // Bitboard representation of the position
-  Bitboard empty_squares() const;
   Bitboard occupied_squares() const;
   Bitboard pieces(Color c) const;
   Bitboard pieces(PieceType pt) const;
@@ -126,6 +127,7 @@ public:
   // Castling rights
   bool can_castle(CastleRight f) const;
   bool can_castle(Color c) const;
+  bool castle_impeded(CastleRight f) const;
   Square castle_rook_square(CastleRight f) const;
 
   // Bitboards for pinned pieces and discovered check candidates
@@ -173,31 +175,24 @@ public:
   int see_sign(Move m) const;
 
   // Accessing hash keys
-  Key get_key() const;
-  Key get_exclusion_key() const;
-  Key get_pawn_key() const;
-  Key get_material_key() const;
+  Key key() const;
+  Key exclusion_key() const;
+  Key pawn_key() const;
+  Key material_key() const;
 
   // Incremental evaluation
   Score value() const;
   Value non_pawn_material(Color c) const;
   Score pst_delta(Piece piece, Square from, Square to) const;
 
-  // Game termination checks
-  bool is_mate() const;
+  // Other properties of the position
   template<bool SkipRepetition> bool is_draw() const;
-
-  // Plies from start position to the beginning of search
   int startpos_ply_counter() const;
-
-  // Other properties of the position
   bool opposite_colored_bishops() const;
+  bool both_color_bishops(Color c) const;
   bool has_pawn_on_7th(Color c) const;
   bool is_chess960() const;
-
-  // Current thread ID searching on the position
   int thread() const;
-
   int64_t nodes_searched() const;
   void set_nodes_searched(int64_t n);
 
@@ -213,7 +208,7 @@ private:
   // Initialization helper functions (used while setting up a position)
   void clear();
   void put_piece(Piece p, Square s);
-  void set_castle_right(Square ksq, Square rsq);
+  void set_castle_right(Color c, Square rfrom);
   bool move_is_legal(const Move m) const;
 
   // Helper template functions
@@ -248,6 +243,7 @@ private:
   // Other info
   int castleRightsMask[64];    // [square]
   Square castleRookSquare[16]; // [castleRight]
+  Bitboard castlePath[16];     // [castleRight]
   StateInfo startState;
   int64_t nodes;
   int startPosPly;
@@ -259,7 +255,7 @@ private:
   // Static variables
   static Score pieceSquareTable[16][64]; // [piece][square]
   static Key zobrist[2][8][64];          // [color][pieceType][square]/[piece count]
-  static Key zobEp[64];                  // [square]
+  static Key zobEp[8];                   // [file]
   static Key zobCastle[16];              // [castleRight]
   static Key zobSideToMove;
   static Key zobExclusion;
@@ -277,8 +273,12 @@ inline Piece Position::piece_on(Square s) const {
   return board[s];
 }
 
+inline Piece Position::piece_moved(Move m) const {
+  return board[from_sq(m)];
+}
+
 inline bool Position::square_is_empty(Square s) const {
-  return board[s] == PIECE_NONE;
+  return board[s] == NO_PIECE;
 }
 
 inline Color Position::side_to_move() const {
@@ -289,10 +289,6 @@ inline Bitboard Position::occupied_squares() const {
   return occupied;
 }
 
-inline Bitboard Position::empty_squares() const {
-  return ~occupied;
-}
-
 inline Bitboard Position::pieces(Color c) const {
   return byColorBB[c];
 }
@@ -337,41 +333,32 @@ inline bool Position::can_castle(Color c) const {
   return st->castleRights & ((WHITE_OO | WHITE_OOO) << c);
 }
 
-inline Square Position::castle_rook_square(CastleRight f) const {
-  return castleRookSquare[f];
+inline bool Position::castle_impeded(CastleRight f) const {
+  return occupied & castlePath[f];
 }
 
-template<>
-inline Bitboard Position::attacks_from<PAWN>(Square s, Color c) const {
-  return StepAttacksBB[make_piece(c, PAWN)][s];
+inline Square Position::castle_rook_square(CastleRight f) const {
+  return castleRookSquare[f];
 }
 
-template<PieceType Piece> // Knight and King and white pawns
+template<PieceType Pt>
 inline Bitboard Position::attacks_from(Square s) const {
-  return StepAttacksBB[Piece][s];
-}
-
-template<>
-inline Bitboard Position::attacks_from<BISHOP>(Square s) const {
-  return bishop_attacks_bb(s, occupied_squares());
+  return  Pt == BISHOP || Pt == ROOK ? attacks_bb<Pt>(s, occupied_squares())
+        : Pt == QUEEN  ? attacks_from<ROOK>(s) | attacks_from<BISHOP>(s)
+        : StepAttacksBB[Pt][s];
 }
 
 template<>
-inline Bitboard Position::attacks_from<ROOK>(Square s) const {
-  return rook_attacks_bb(s, occupied_squares());
-}
-
-template<>
-inline Bitboard Position::attacks_from<QUEEN>(Square s) const {
-  return attacks_from<ROOK>(s) | attacks_from<BISHOP>(s);
+inline Bitboard Position::attacks_from<PAWN>(Square s, Color c) const {
+  return StepAttacksBB[make_piece(c, PAWN)][s];
 }
 
 inline Bitboard Position::attacks_from(Piece p, Square s) const {
-  return attacks_from(p, s, occupied_squares());
+  return attacks_from(p, s, occupied);
 }
 
 inline Bitboard Position::attackers_to(Square s) const {
-  return attackers_to(s, occupied_squares());
+  return attackers_to(s, occupied);
 }
 
 inline Bitboard Position::checkers() const {
@@ -391,22 +378,22 @@ inline Bitboard Position::pinned_pieces() const {
 }
 
 inline bool Position::pawn_is_passed(Color c, Square s) const {
-  return !(pieces(PAWN, flip(c)) & passed_pawn_mask(c, s));
+  return !(pieces(PAWN, ~c) & passed_pawn_mask(c, s));
 }
 
-inline Key Position::get_key() const {
+inline Key Position::key() const {
   return st->key;
 }
 
-inline Key Position::get_exclusion_key() const {
+inline Key Position::exclusion_key() const {
   return st->key ^ zobExclusion;
 }
 
-inline Key Position::get_pawn_key() const {
+inline Key Position::pawn_key() const {
   return st->pawnKey;
 }
 
-inline Key Position::get_material_key() const {
+inline Key Position::material_key() const {
   return st->materialKey;
 }
 
@@ -428,8 +415,8 @@ inline Value Position::non_pawn_material(Color c) const {
 
 inline bool Position::is_passed_pawn_push(Move m) const {
 
-  return   board[move_from(m)] == make_piece(sideToMove, PAWN)
-        && pawn_is_passed(sideToMove, move_to(m));
+  return   board[from_sq(m)] == make_piece(sideToMove, PAWN)
+        && pawn_is_passed(sideToMove, to_sq(m));
 }
 
 inline int Position::startpos_ply_counter() const {
@@ -443,6 +430,12 @@ inline bool Position::opposite_colored_bishops() const {
         && opposite_colors(pieceList[WHITE][BISHOP][0], pieceList[BLACK][BISHOP][0]);
 }
 
+inline bool Position::both_color_bishops(Color c) const {
+  // Assumes that there are only two bishops
+  return  pieceCount[c][BISHOP] >= 2 &&
+          opposite_colors(pieceList[c][BISHOP][0], pieceList[c][BISHOP][1]);
+}
+
 inline bool Position::has_pawn_on_7th(Color c) const {
   return pieces(PAWN, c) & rank_bb(relative_rank(c, RANK_7));
 }
@@ -454,14 +447,14 @@ inline bool Position::is_chess960() const {
 inline bool Position::is_capture_or_promotion(Move m) const {
 
   assert(is_ok(m));
-  return is_special(m) ? !is_castle(m) : !square_is_empty(move_to(m));
+  return is_special(m) ? !is_castle(m) : !square_is_empty(to_sq(m));
 }
 
 inline bool Position::is_capture(Move m) const {
 
   // Note that castle is coded as "king captures the rook"
   assert(is_ok(m));
-  return (!square_is_empty(move_to(m)) && !is_castle(m)) || is_enpassant(m);
+  return (!square_is_empty(to_sq(m)) && !is_castle(m)) || is_enpassant(m);
 }
 
 inline PieceType Position::captured_piece_type() const {