user24788: 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.
[FEN ""]

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!)

user26052: This trap is the Elephant Trap.
The video is:
Crazy Queen's Gambit Declined and Secret Preparation Revealed

user13928: This is known as the Elephant Trap.

24788: <p>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.</p>
<pre><code>[FEN &quot;&quot;]

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.}
</code></pre>
<p>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!)</p>
 26052: <p>This trap is the Elephant Trap.</p>
<p>The video is:</p>
<p><a href="https://www.youtube.com/watch?v=OP_-UHafujw" rel="noreferrer">Crazy Queen's Gambit Declined and Secret Preparation Revealed</a></p>
 13928: <p>This is known as the <a href="https://en.wikipedia.org/wiki/Queen%27s_Gambit_Declined,_Elephant_Trap" rel="noreferrer">Elephant Trap</a>.</p>
