Because black can move Kb4 and then force exchange of pawns through Pa5 after which it's King vs King + Bishop / Knight with no pawns and from memory that's a draw.
Because black can move Kb4 and then force exchange of pawns through Pa5 after which it's King vs King + Bishop / Knight with no pawns and from memory that's a draw.
RE: Chess problem 49 / Schachaufgabe 49