🧠 Call the Arbiter (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. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. d4 cxd4 5. Nxd4 e5 6. Nxc6 bxc6 7. Bxc6+ Bd7 8. Bxa8 Qxa8 9. 0-0 Nf6 10. b3 Be7 11. Bb2 0-0 *

And the answer is...
White's move 7. Bxc6+ is illegal because there is a pawn on d5, blocking the Bishop's path.