Correct answer: Nb:d51...Kf7 2.g8Q# 1...Qf2/Qf1/Qf4/Qf5/Qf6/Qf7/Qf8/Qe3/Qd3/Qa3/Qg3/Qh3/Q:g4/Qe2/Qd1 2.Q:d5# 1.R