Correct answer: Kb61...Nd1 2.Q:c4# 1...b:c2 2.Q:c2# 1...Ra6+ 2.R:a6# 1...Ra7 2.R:a7# 1...R:a8 2.b:a8Q#/b:a8R# 1...Qb4 2.Nb6#/Qb5# 1...Qd4/
