Two people, A and B, are playing chess, in the position, A is completely losing because of the rook vs. three pawns + knight + bishop ending. But, B blunders two times and lost two pawns. After this, B protects his pawn with his bishop, so A’s rook can’t take it. But, A smashes his rook to B’s pawn!!!!! And? B immediately offers a draw! He said: “I don’t know how to checkmate with a knight and a bishop!”