🧠 Queen's Gambit Defiled (Illegal Move Exercise)

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 e6 3. Nf3 Bg4 4. e3 Nf6 5. Be2 0-0 6.Nc3 c6 *

And the answer is...
Black's move 3... Bg4 is illegal because it is blocked by the pawn on e6.