Correct answer: Qh51. ... f6 , Kd5 2. Qb3# 1. Qa1? waiting 1. ... f6 , Kd5 2. Qa2# But 1. ... Kf6! 1. Qc1? waiting 1. ... f6 2. Qc4# 1. ... Kd5 2. Bb
