Correct answer: c:d71...Qc7 2.Neg6# 1...Qb6 2.R:d7#/Neg6# 1.Bf7?? (2.Neg6#/Nfg6#) 1...K:f8 2.Ng6# 1...Q:f8 2.Ng6#/R:d7# but 1...Q:c8!
