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Can the Black prevent the mate in a8?

What move should the Black play, so as to prevent the mate in a8?

(White: Kg1, Qc6, Ra3, Rc1, Nf2, a2, b2, g2, h2. Black: Kb8, Qg5, Rd8, Re8, Be5, b6, c7, f7, g7, h7.)

Prevent mate in a8

Solution