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. d4 d5 2. Nf3 Nf6 3. c4 c6 4. cxd5 cxd5 5. Nc3 Nxd5 6. Nxd5 Qxd5 7. g3 Nc6 *

And the answer is...