Chess Opening Theory/1. d4/1...d6/2. c4/2...e5/3. dxe5

=Rat Defence= At this point, black has 2 main options. /3...dxe5/ is surprisingly popular, but black is slightly worse according to the engine. Better is /3...Nc6/, the Lisbon Gambit, developing aggressively and attacking the e5 pawn.