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:
1. Nf3 d5 2. c4 dxc4 3. e3 e6 4. Bxc4 a6 5. a3 Bb4 *
And the answer is...
axb4