Home * Engines * CPW-Engine * Recognizer
#include "stdafx.h"
int is_rim[64] = {
1, 1, 1, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 0, 1,
1, 1, 1, 1, 1, 1, 1, 1
};
/* please note that this recognizer assumes that the position is legal,
i.e. side to move is not in check */
int isDraw() {
/* no pawns */
if (!b.PawnMaterial[WHITE] && !b.PawnMaterial[BLACK]) {
/* both sides have at most one minor piece - to guard against the possibility
of a helpmate in the corner, we do not claim an immediate draw if the king
of the weaker side stands on the edge of the board */
if (b.PieceMaterial[WHITE] < 400 &&
b.PieceMaterial[BLACK] < 400 &&
(!is_rim[b.KingLoc[WHITE]] || b.PieceMaterial[BLACK] == 0) &&
(!is_rim[b.KingLoc[BLACK]] || b.PieceMaterial[WHITE] == 0)
)
return 1;
}
/* default: no draw spotted */
return 0;
}