1...Rxf1+ White can take the rook or move the king. If he moves the king anywhere, Rxf4 is pretty strong. :) If: 2. Kxf1 Bd3+ wins the queen anyway. And regardless of whether white moves the king to e1 or g1 or, even worse, interposes the rook to d2, mate threats abound. Even my cat should be able to win the game thereafter. Best regards, Jim T