Correct answer: Rg81...Rg4 2.Nf1# 1.Bh5[A]? (2.Nf1#) 1...Rg8+ 2.R:g8# but 1...R:h5[a]! 1.Bf5[Б]? (2.Nf1#) 1...Rg8+ 2.R:g8# but 1...R:f5/[б]/!
