🧠🧠 A Sneaky One (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. c4 Nf6 2. Nf3 g6 3. Nc3 Bg7 4. e4 d6 5. d4 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. b4 Nh6 10. Ng5 f5 11. h4 a5 12. bxa5 Rxa5 13. Bd2 Ra8 14. a4 fxe4 15. Ngxe4 Nhf5 *

And the answer is...
Black’s move 9… Nh6 is illegal as neither of Black’s knights can reach the h6 square on that turn.