This chess position is based on a tactical motif by Karjakin
White to move!
a) 1...Qxb6, 2. Rxb6+ Rd5, 3. Bxd5+ Rc6, 4. Bxc6#
b) 1...axb6, 2. Rxb6+! Qc6, 3. Qa5#
White has a strong attack. But will it mount to anything?
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Please fill out the full answer