Chess Trap #1
Interesting line. There is a possible refutation to the trap to prevent him from losing a piece, but in my honest opinion, I think that the cramped position favors White.
4. d4 e6?! [The point is not to allow 5. d5 to attack a knight with tempo] 5. c5 Nd5 6. Nc3
However, the game might transpose into the Four Pawns Attack variation of the Alekhine Defense after...
4. ...d5 5. f4