Correct answer: Qe11. Qe1! 1... Rh1 2. Qe6+ 2... K:d4 3. Qe4# 1... Kc4 2. Qe4 2... K:b4 3. B:b6# 1... Kc6 2. Qe6+ 2... Kc7 3. B:b6#
