Correct answer: Rd61...f3 2.Ng3# 1.Re7?? zz 1...f3 2.Ng3# but 1...d3! 1.Re8?? zz 1...f3 2.Ng3# but 1...d3! 1.Rc6?? zz 1...f3 2.Ng3# but 1...d3! 1.Rb6?? z
