/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2008-2014 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
/// For Windows, part of the configuration is detected automatically, but some
/// switches need to be set manually:
///
-/// -DNDEBUG | Disable debugging mode. Use always.
+/// -DNDEBUG | Disable debugging mode. Always use this.
///
/// -DNO_PREFETCH | Disable use of prefetch asm-instruction. A must if you want
/// | the executable to run on some very old machines.
typedef uint64_t Key;
typedef uint64_t Bitboard;
-const int MAX_MOVES = 192;
-const int MAX_PLY = 100;
+const int MAX_MOVES = 256;
+const int MAX_PLY = 120;
const int MAX_PLY_PLUS_6 = MAX_PLY + 6;
/// A move needs 16 bits to be stored
/// bit 0- 5: destination square (from 0 to 63)
/// bit 6-11: origin square (from 0 to 63)
/// bit 12-13: promotion piece type - 2 (from KNIGHT-2 to QUEEN-2)
-/// bit 14-15: special move flag: promotion (1), en passant (2), castle (3)
+/// bit 14-15: special move flag: promotion (1), en passant (2), castling (3)
+/// NOTE: EN-PASSANT bit is set only when a pawn can be captured
///
/// Special cases are MOVE_NONE and MOVE_NULL. We can sneak these in because in
/// any normal move destination square is always different from origin square
NORMAL,
PROMOTION = 1 << 14,
ENPASSANT = 2 << 14,
- CASTLE = 3 << 14
+ CASTLING = 3 << 14
};
-enum CastleRight { // Defined as in PolyGlot book hash key
- CASTLES_NONE,
+enum Color {
+ WHITE, BLACK, NO_COLOR, COLOR_NB = 2
+};
+
+enum CastlingSide {
+ KING_SIDE, QUEEN_SIDE, CASTLING_SIDE_NB = 2
+};
+
+enum CastlingRight { // Defined as in PolyGlot book hash key
+ NO_CASTLING,
WHITE_OO,
WHITE_OOO = WHITE_OO << 1,
BLACK_OO = WHITE_OO << 2,
BLACK_OOO = WHITE_OO << 3,
- ALL_CASTLES = WHITE_OO | WHITE_OOO | BLACK_OO | BLACK_OOO,
- CASTLE_RIGHT_NB = 16
+ ANY_CASTLING = WHITE_OO | WHITE_OOO | BLACK_OO | BLACK_OOO,
+ CASTLING_RIGHT_NB = 16
};
-enum CastlingSide {
- KING_SIDE,
- QUEEN_SIDE,
- CASTLING_SIDE_NB = 2
+template<Color C, CastlingSide S> struct MakeCastling {
+ static const CastlingRight
+ right = C == WHITE ? S == QUEEN_SIDE ? WHITE_OOO : WHITE_OO
+ : S == QUEEN_SIDE ? BLACK_OOO : BLACK_OO;
};
enum Phase {
};
enum ScaleFactor {
- SCALE_FACTOR_DRAW = 0,
- SCALE_FACTOR_NORMAL = 64,
- SCALE_FACTOR_MAX = 128,
- SCALE_FACTOR_NONE = 255
+ SCALE_FACTOR_DRAW = 0,
+ SCALE_FACTOR_ONEPAWN = 48,
+ SCALE_FACTOR_NORMAL = 64,
+ SCALE_FACTOR_MAX = 128,
+ SCALE_FACTOR_NONE = 255
};
enum Bound {
enum Value {
VALUE_ZERO = 0,
VALUE_DRAW = 0,
- VALUE_KNOWN_WIN = 15000,
+ VALUE_KNOWN_WIN = 10000,
VALUE_MATE = 30000,
VALUE_INFINITE = 30001,
VALUE_NONE = 30002,
PIECE_NB = 16
};
-enum Color {
- WHITE, BLACK, NO_COLOR, COLOR_NB = 2
-};
-
enum Depth {
ONE_PLY = 2,
DEPTH_ZERO = 0 * ONE_PLY,
- DEPTH_QS_CHECKS = -1 * ONE_PLY,
- DEPTH_QS_NO_CHECKS = -2 * ONE_PLY,
+ DEPTH_QS_CHECKS = 0 * ONE_PLY,
+ DEPTH_QS_NO_CHECKS = -1 * ONE_PLY,
DEPTH_QS_RECAPTURES = -5 * ONE_PLY,
DEPTH_NONE = -127 * ONE_PLY
};
-/// Score enum keeps a midgame and an endgame value in a single integer (enum),
-/// first LSB 16 bits are used to store endgame value, while upper bits are used
-/// for midgame value. Compiler is free to choose the enum type as long as can
-/// keep its data, so ensure Score to be an integer type.
+/// The Score enum stores a middlegame and an endgame value in a single integer
+/// (enum). The least significant 16 bits are used to store the endgame value
+/// and the upper 16 bits are used to store the middlegame value. The compiler
+/// is free to choose the enum type as long as it can store the data, so we
+/// ensure that Score is an integer type by assigning some big int values.
enum Score {
SCORE_ZERO,
SCORE_ENSURE_INTEGER_SIZE_P = INT_MAX,
inline Score make_score(int mg, int eg) { return Score((mg << 16) + eg); }
-/// Extracting the signed lower and upper 16 bits it not so trivial because
+/// Extracting the signed lower and upper 16 bits is not so trivial because
/// according to the standard a simple cast to short is implementation defined
/// and so is a right shift of a signed integer.
inline Value mg_value(Score s) { return Value(((s + 0x8000) & ~0xffff) / 0x10000); }
/// On Intel 64 bit we have a small speed regression with the standard conforming
-/// version, so use a faster code in this case that, although not 100% standard
-/// compliant it seems to work for Intel and MSVC.
+/// version. Therefore, in this case we use faster code that, although not 100%
+/// standard compliant, seems to work for Intel and MSVC.
#if defined(IS_64BIT) && (!defined(__GNUC__) || defined(__INTEL_COMPILER))
-inline Value eg_value(Score s) { return Value(int16_t(s & 0xffff)); }
+inline Value eg_value(Score s) { return Value(int16_t(s & 0xFFFF)); }
#else
inline Value eg_value(Score s) {
- return Value((int)(unsigned(s) & 0x7fffu) - (int)(unsigned(s) & 0x8000u));
+ return Value((int)(unsigned(s) & 0x7FFFU) - (int)(unsigned(s) & 0x8000U));
}
#endif
ENABLE_OPERATORS_ON(File)
ENABLE_OPERATORS_ON(Rank)
-/// Added operators for adding integers to a Value
+/// Additional operators to add integers to a Value
inline Value operator+(Value v, int i) { return Value(int(v) + i); }
inline Value operator-(Value v, int i) { return Value(int(v) - i); }
}
inline Color operator~(Color c) {
- return Color(c ^ 1);
+ return Color(c ^ BLACK);
}
inline Square operator~(Square s) {
- return Square(s ^ 56); // Vertical flip SQ_A1 -> SQ_A8
+ return Square(s ^ SQ_A8); // Vertical flip SQ_A1 -> SQ_A8
}
-inline Square operator|(File f, Rank r) {
- return Square((r << 3) | f);
+inline CastlingRight operator|(Color c, CastlingSide s) {
+ return CastlingRight(WHITE_OO << ((s == QUEEN_SIDE) + 2 * c));
}
inline Value mate_in(int ply) {
return -VALUE_MATE + ply;
}
-inline Piece make_piece(Color c, PieceType pt) {
- return Piece((c << 3) | pt);
+inline Square make_square(File f, Rank r) {
+ return Square((r << 3) | f);
}
-inline CastleRight make_castle_right(Color c, CastlingSide s) {
- return CastleRight(WHITE_OO << ((s == QUEEN_SIDE) + 2 * c));
+inline Piece make_piece(Color c, PieceType pt) {
+ return Piece((c << 3) | pt);
}
inline PieceType type_of(Piece p) {
return Rank(s >> 3);
}
-inline Square mirror(Square s) {
- return Square(s ^ 7); // Horizontal flip SQ_A1 -> SQ_H1
-}
-
inline Square relative_square(Color c, Square s) {
return Square(s ^ (c * 56));
}
return ((s >> 3) ^ s) & 1;
}
-inline char file_to_char(File f, bool tolower = true) {
+inline char to_char(File f, bool tolower = true) {
return char(f - FILE_A + (tolower ? 'a' : 'A'));
}
-inline char rank_to_char(Rank r) {
+inline char to_char(Rank r) {
return char(r - RANK_1 + '1');
}
#include <string>
-inline const std::string square_to_string(Square s) {
- char ch[] = { file_to_char(file_of(s)), rank_to_char(rank_of(s)), 0 };
+inline const std::string to_string(Square s) {
+ char ch[] = { to_char(file_of(s)), to_char(rank_of(s)), 0 };
return ch;
}
projects / stockfish / blobdiff