🧠 Double Take (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. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nxd4 5. Qxd4 Nc6 6.Qd1 Nf6 7.Nc3 Bb4 8.Bd3 0-0 9.0-0 *

And the answer is...
Black's move 5...Nc6 is illegal because the Knight got exchanged on the previous move.