🧠🧠 Ill Advised (Opening Exercise)

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. c4 Nf6 2. g3 c6 3. Bg2 d5 4. b3 Bf5 5. Bb2 e6 6. Nf3 Bd6 7. O-O Nbd7 8. d3 O-O 9. Nbd2 Qe7 10. Re1 Rfe8
And the answer is...
e4 dxe4 12. dxe4 { 1-0 White wins. }