🧠 The Rules Gambit (Illegal Move Exercise)

Illegal Move Exercise: The audio will lead you through a series of moves from the beginning of a game. Somewhere in there, a player will make an illegal move but the game will continue anyway. Find the illegal move.

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PGN for today's exercise:

• d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Be7 5. Bg2 O-O 6. O-O dxc4 7. Nc3 Nc6 8. Bxc6 bxc6 9. e4 Ba6 10. e5 Nd5 11. Nxd5 cxd5 *