I recently watched an Eric Rosen video where he showcased a trap in the QGD. I do not remember what the trap was called. Here are the moves.
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1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 {The trap is this move, because the d5 pawn is not actually free} 5. cxd5 exd5 6. Nxd5 Nxd5! {And White falls for it!} 7. Bxd8 Bb4+! 8. Qd2 {White is forced to give up their queen since that is his only move} Bxd2+ 9. Kxd2 Kxd8 {Black is up a knight, and has a safer king than White, and White’s only compensation is a pawn. Lichess’s Stockfish rates this to be ~-3.}
I don’t remember the name of the trap. If anyone could let me know that would be great. (Bonus points for anyone who can link me the Eric Rosen video!)