Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Bc5/4. c3/4...Nf6/5. d4/5...exd4/6. b4/6...Be7

= Dubov Gambit =

6...Be7
Black retreats the bishop to e7. This retreat is generally considered safer, as it blocks any checks on the e file and controls the g5 square. Black will give back the d pawn and try to achieve d5.

Theory table
'''1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. b4 Be7'''