Correct answer: Nd81...Kf6 2.Bd4# 1...Nc4/Nc8/Nd5/Nd7/Na4/Na8 2.Nd7# 1...Ng4/Nh1/Nh3/Nd1/Nd3 2.Rf5# 1.R:b6?? (2.Nd7#)
