🧠 Transposed (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. d4 Nf6 3. c4 e6 4. g3 Bb4+ 5. Nbd2 O-O 6. Bg2 Nbd7 7. Qc2 dxc4 8. Nxc4 Be7 9. 0-0 c5 10. Rd1 Qc7 11. Bf4 Bd6 *

And the answer is...
White's move 8. Nxc4 is illegal because the Knight is pinned by the black Bishop on b4.