Correct answer: Rc31.Rc4?? (2.Rd4#) but 1...b:c4! 1.Rc5?? (2.Rd5#) but 1...b:c5! 1.Rc6?? (2.Rd6#) but 1...b:c6! 1.Rc3! (2.Rd3#) 1...b:c3 2.d:c3#