🧠 Returns Null (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. b3 e5 2. Bb2 f6 3. Nc3 f5 4. Bxe5 Nf6 5. Nf3 Nc6 *

And the answer is...
White's move 4. Bxe5 is illegal because the Bishop is blocked by the Knight on c3.