Expose EvalInfo struct to search

[stockfish] / src / evaluate.h

diff --git a/src/evaluate.h b/src/evaluate.h
index 8eb396423a989e7fe332afa2545de35683f50954..f09163a25430ba92166ef5c6a1092e19ccdaff3c 100644 (file)
--- a/src/evaluate.h
+++ b/src/evaluate.h
@@ -20,14 +20,56 @@
 #if !defined(EVALUATE_H_INCLUDED)
 #define EVALUATE_H_INCLUDED
 
+#include "material.h"
+#include "pawns.h"
 #include "types.h"
 
 class Position;
 
 namespace Eval {
 
+// Struct Eval::Info contains various information computed and collected
+// by the evaluation functions.
+struct Info {
+
+  // Pointers to material and pawn hash table entries
+  Material::Entry* mi;
+  Pawns::Entry* pi;
+
+  // attackedBy[color][piece type] is a bitboard representing all squares
+  // attacked by a given color and piece type, attackedBy[color][ALL_PIECES]
+  // contains all squares attacked by the given color.
+  Bitboard attackedBy[COLOR_NB][PIECE_TYPE_NB];
+
+  // kingRing[color] is the zone around the 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, kingRing[BLACK] is a bitboard containing the squares f8, h8,
+  // f7, g7, h7, f6, g6 and h6.
+  Bitboard kingRing[COLOR_NB];
+
+  // kingAttackersCount[color] is the number of pieces of the given color
+  // which attack a square in the kingRing of the enemy king.
+  int kingAttackersCount[COLOR_NB];
+
+  // kingAttackersWeight[color] is the sum of the "weight" of the pieces of the
+  // given color which attack a square in the kingRing 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[COLOR_NB];
+
+  // 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 kingAdjacentZoneAttacksCount[BLACK].
+  int kingAdjacentZoneAttacksCount[COLOR_NB];
+};
+
 extern void init();
-extern Value evaluate(const Position& pos, Value& margin);
+extern Value evaluate(const Position& pos, Value& margin, Info* ei);
 extern std::string trace(const Position& pos);
 
 }