🧠 The Getaway Plan (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:

1. b3 a5 2. Ba3 a4 3. Bxe7 Kxe7 4. c4 Ke8 5. d4 Bb4+ 6. Nd2 Nf6 7. Nf3 O-O 8. a3 Bxd2+ 9. Nxd2 axb3 10. Qxb3 b6 *

And the answer is...
7...0-0