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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:
h4 Nf6 2. Rh3 e5 3. e3 Bc5 4. Nh3 0-0 5. Bc4 d5 6. Bb3 *
And the answer is...
White's move 4. Nh3 is illegal because the white Rook is occupying that square.