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. d4 exd4 3. Qxd4 Nc6 4. Qa4 Nf6 5. Nc3 Be7 6. Nf3 0-0 *

And the answer is...

White's move 4. Qa4 is illegal because the pawn on c4 is blocking the Queen's path.