I heard from Robert Irons, correspondence chess editor for the US Chess Federation's Chess Online website. He wrote, "I am writing to share a BDG game that I recently played in a correspondence tournament -- or rather I should say I played against the BDG. I have faced the gambit several times in my life, and before this game I had lost all but one, managing a draw in the other. I used Christoph Sheerer's book..."
Robert played great in this game. As White, I prefer 5.fxe4. After 5.Bc4, Black stands better. The BDG is a good blitz opening, but more difficult for correspondence play these days. When my BDG days were at their peak, there were no databases and only weak chess engines. Here's the game between Klaus Montermann and Robert Irons.
[Note: Facebook locked me out during a power outage. My email is below.]
For 6 gambits, see my Quick Chess Lesson collection Chess Gambits for Black.
Montermann - Irons, GER - USA 2022 ICCF, 12.10.2022 begins 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c6 [This BDG position is reached about 3% of the time.]
5.Bc4 [More accurate is 5.fxe4 e5 6.dxe5 Qxd1+ 7.Nxd1 Nxe4 8.Nf3 with chances for both sides.] 5...exf3 6.Nxf3 Bf5 7.Ne5 [Another common variation is 7.0–0 e6 8.Ng5 Bg6 9.Ne2 where White has scored 49% in my database.] 7...e6 8.0–0 Bg6 9.Nxg6 hxg6 10.Bg5 Nbd7 11.h3 Qb6 12.a4 a5 13.Be3 0–0–0 14.Ne2 Bd6 15.Rf3 g5 16.Bxg5 Ne5 17.Rc3 Rh5 18.Bxf6 gxf6 19.Rb3 Qa7 20.Bd3 f5 21.Kh1 Ng4 22.Qf1 Bc7 23.Re1 Kb8 24.c4 Rxd4 25.Nxd4 Qxd4 26.Re2 e5 [White resigns] 0–1