Correct answer: Qa11.Nd1?? (2.Q:b2#) but 1...c3! 1.Na4?? (2.Q:b2#) but 1...c3! 1.Qa1! zz 1...Rb1 2.N:b1# 1...Rb3 2.Bb1# 1...Rb4/Rb6/Rb7/<
