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 e5 2. Nc3 Nf6 3. d3 Bc5 4. Bd2 Qh4 5. e3 0-0 6. Nf3 *

And the answer is...

Black's move 4... Qh4 is illegal because the Queen is blocked by the Knight on f6.