/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2009 Marco Costalba
+ Copyright (C) 2008-2010 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
/// contents to make intelligent search decisions.
///
/// At the moment, this is not utilized very much: The only part of the
-/// EvalInfo object which is used by the search is futilityMargin.
+/// EvalInfo object which is used by the search is margin.
class Position;
struct EvalInfo {
- EvalInfo() : futilityMargin(Value(0)) {}
-
- // Middle game and endgame evaluations
+ // Middle and end game position's static evaluations
Score value;
+ // margin[color] stores the evaluation margins we should consider for
+ // the given position. This is a kind of uncertainty estimation and
+ // typically is used by the search for pruning decisions.
+ Value margin[2];
+
// Pointers to material and pawn hash table entries
MaterialInfo* mi;
PawnInfo* pi;
// attacked by a given color and piece type, attackedBy[color][0] contains
// all squares attacked by the given color.
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]; }
// kingZone[color] is the zone around the enemy king which is considered
// by the king safety evaluation. This consists of the squares directly
// king is on g8 and there's a white knight on g5, this knight adds
// 2 to kingAdjacentZoneAttacksCount[BLACK].
int kingAdjacentZoneAttacksCount[2];
-
- // mateThreat[color] is a move for the given side which gives a direct mate.
- Move mateThreat[2];
-
- // Middle game and endgame mobility scores.
- Score mobility;
-
- // Extra futility margin. This is added to the standard futility margin
- // in the quiescence search.
- Value futilityMargin;
};
//// Prototypes
////
-extern Value evaluate(const Position& pos, EvalInfo& ei, int threadID);
+extern Value evaluate(const Position& pos, EvalInfo& ei);
extern void init_eval(int threads);
extern void quit_eval();
extern void read_weights(Color sideToMove);