Correct answer: Qe51. N:b5? [2. Bf1#] 1. ... Rh7 2. Na3# 1. ... c:b5 2. Q:c5# But 1. ... d4! 1. N:d5? [2. Bf1#] 1. ... Rh7 2. Nb6# 1. ... c:d5 2. Q:c5#