Episode Details

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. c4 c6 3. Nf3 g6 4. g3 Bg7 5. Bg2 Bg4 6. O-O Nd7 7. cxd5 Nxd5 8.Nc3 Qc7 9.e4 Nb4 *

And the answer is...
Black's move 7...Nxd5 is illegal because one Knight is on d7 and the other one is still on g8.