🧠 Dubious at Best (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. Ke2 Ke7 3. Bc4 Nf6 4. Nc3 Nc6 5. d4 Ke8 *

And the answer is...
White’s move 3. Bc4 is illegal as the king on e2 prevents the light-squared bishop from developing in that direction.