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 Nf6 2. c4 Bb4+ 3. Bd2 a5 4. a3 Bxd2+ 5. Qxd2 Ne4 6.Qc2 d5 *

And the answer is...

Black's move 2...Bb4+ was illegal because the Bishop is blocked by the pawn on e7.