/*
- Glaurung, a UCI chess playing engine.
- Copyright (C) 2004-2008 Tord Romstad
+ Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+ Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+ Copyright (C) 2008 Marco Costalba
- Glaurung is free software: you can redistribute it and/or modify
+ Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
- Glaurung is distributed in the hope that it will be useful,
+ Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Bitboard attackedBy[2][8];
Bitboard attacked_by(Color c) const { return attackedBy[c][0]; }
Bitboard attacked_by(Color c, PieceType pt) const { return attackedBy[c][pt]; }
- // attackZone[color] is the zone around the enemy king which is considered
+
+ // kingZone[color] is the zone around the enemy king which is considered
// by the king safety evaluation. This consists of the squares directly
// adjacent to the king, and the three (or two, for a king on an edge file)
// squares two ranks in front of the king. For instance, if black's king
- // is on g8, attackZone[WHITE] is a bitboard containing the squares f8, h8,
+ // is on g8, kingZone[WHITE] is a bitboard containing the squares f8, h8,
// f7, g7, h7, f6, g6 and h6.
- Bitboard attackZone[2];
-
- // attackCount[color] is the number of pieces of the given color which
- // attack a square adjacent to the enemy king.
- int attackCount[2];
-
- // attackWeight[color] is the sum of the "weight" of the pieces of the given
- // color which attack a square adjacent to the enemy king. The weights of
- // the individual piece types are given by the variables QueenAttackWeight,
- // RookAttackWeight, BishopAttackWeight and KnightAttackWeight in
- // evaluate.cpp.
- int attackWeight[2];
-
- // attacked[color] is the number of enemy piece attacks to squares directly
- // adjacent to the king of the given color. Pieces which attack more
- // than one square are counted multiple times. For instance, if black's
+ Bitboard kingZone[2];
+
+ // kingAttackersCount[color] is the number of pieces of the given color
+ // which attack a square in the kingZone of the enemy king.
+ int kingAttackersCount[2];
+
+ // kingAttackersWeight[color] is the sum of the "weight" of the pieces of the
+ // given color which attack a square in the kingZone of the enemy king. The
+ // weights of the individual piece types are given by the variables
+ // QueenAttackWeight, RookAttackWeight, BishopAttackWeight and
+ // KnightAttackWeight in evaluate.cpp
+ int kingAttackersWeight[2];
+
+ // kingAdjacentZoneAttacksCount[color] is the number of attacks to squares
+ // directly adjacent to the king of the given color. Pieces which attack
+ // more than one square are counted multiple times. For instance, if black's
// king is on g8 and there's a white knight on g5, this knight adds
- // 2 to attacked[BLACK].
- int attacked[2];
+ // 2 to kingAdjacentZoneAttacksCount[BLACK].
+ int kingAdjacentZoneAttacksCount[2];
// mateThreat[color] is a move for the given side which gives a direct mate.
Move mateThreat[2];