🧠🧠 Kings Repulsed (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. d3 d6 2. e4 e5 3. Be3 c5 4. Nc3 Nc6 5. Nf3 Nf6 6. Qd2 Be7 7. O-O-O O-O 8. h4 Be6 9. Kb1 h6 10. h5 Qd7 11. Bb5 a6 12. Ba4 b5 13. Bb3 c4 14. dxc4 *

And the answer is...
White's move 11. Bb5 is illegal because the Bishop is blocked by the white pawn on d3.