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. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Nc6 6. Bb5 Bf5 7. d5 Nb4 8. 0-0 Bd7 9. a4 *

And the answer is...
Black's move 7... Nb4 is illegal because the Knight is pinned by White's Bishop on b5.