Opening Exercise: The audio will lead you through a series of moves from the beginning of a game. At a certain point, one player will make a mistake and it’ll be your job to find the move to punish it.
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PGN for today's exercise:
Mackenzie vs Collins (Birmingham, 1893)
And the answer is...
11... Ne4+ 12. Ke3 Qf2+ 13. Kf4 g5#