Correct answer: Rb3-a3 1.Rb3-a3 ! danger: 2.Qf3-b3 # 1...Nf5-d4 2.Qf3-f7 # 1...Nf5-e3 2.Qf3-f7 # 1...Nf5*g3 2.Qf3-f7
