Correct answer: Qh41.Ra4?? (2.Bd5#) 1...N5:c4 2.Re6#(A) but 1...N3:c4!(a) 1.Rb4?? (2.Bd5#) 1...N3:c4 2.Re1#(B) but 1...N5:c4!(b) 1.Re1?? (B