Chess Opening Theory/1. d4/1...e5/2. dxe5/2...Bc5

Black develops the bishop to pressure f2.

This usually leads to the Derek Wu trap, where Black pretends to blunder a pre-move (it therefore is best kept for online blitz or bullet), where, after 3. Nf3 Black plays 3...d6 and premoves 4. Ne7: so after 3...d6 4. exd6 Ne7? White is lulled into a false sense of security. However the obvious move 5. dxe7?? blunders 5...Bxf2+! deflecting White's king from defence of the queen.

Otherwise, the game can continue 3. Nf3 Nc6 and transpose into the Felbecker Gambit (usually reached after 2...Nc6 3. Nf3 Bc5).

3. Nc3, another natural developing move, also acts to defang the trap by adding another defender to the queen.

The trap was developed by Derek Wu. The Chess.com opening book refers to the trap from 6...Qxd1 as the Rosen trap, after IM Eric Rosen who popularised it.^[1]