////
/// PawnInfo is a class which contains various information about a pawn
-/// structure. Currently, it only includes a middle game and an end game
-/// pawn structure evaluation, and a bitboard of passed pawns. We may want
-/// to add further information in the future. A lookup to the pawn hash table
+/// structure. Currently, it only includes a middle game and an end game
+/// pawn structure evaluation, and a bitboard of passed pawns. We may want
+/// to add further information in the future. A lookup to the pawn hash table
/// (performed by calling the get_pawn_info method in a PawnInfoTable object)
/// returns a pointer to a PawnInfo object.
class Position;
int file_is_half_open(Color c, File f) const;
int has_open_file_to_left(Color c, File f) const;
int has_open_file_to_right(Color c, File f) const;
+ int kingShelter(Color c, Square ksq) const;
+ void setKingShelter(Color c, Square ksq, int value);
private:
void clear();
Key key;
Bitboard passedPawns;
+ Square kingSquares[2];
+ int16_t kingShelters[2];
int16_t mgValue, egValue;
int16_t ksStormValue[2], qsStormValue[2];
uint8_t halfOpenFiles[2];
return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
}
+inline int PawnInfo::kingShelter(Color c, Square ksq) const {
+ return (kingSquares[c] == ksq ? kingShelters[c] : -1);
+}
+
+inline void PawnInfo::setKingShelter(Color c, Square ksq, int value) {
+ kingSquares[c] = ksq;
+ kingShelters[c] = (int16_t)value;
+}
+
inline void PawnInfo::clear() {
passedPawns = EmptyBoardBB;
ksStormValue[WHITE] = ksStormValue[BLACK] = 0;
qsStormValue[WHITE] = qsStormValue[BLACK] = 0;
halfOpenFiles[WHITE] = halfOpenFiles[BLACK] = 0xFF;
+ kingSquares[WHITE] = kingSquares[BLACK] = SQ_NONE;
}