Correct answer: Qb81...Kd5 2.c4# 1...Kb5 2.Bd3# 1.Nd6+?? 1...Kd5 2.Rd2#/Bg4#/Bh3#/Bd7#/Bc8#/c4# but 1...Kb3! 1.Rd2?? zz 1...Kb5 2.B<