The Lemberger Counter-Gambit is an important alternative, where Black counterattacks against the d4-pawn instead of defending the attacked e4-pawn. White can head for a drawish endgame with 4.dxe5, e.g. 4...Qxd1+ 5.Kxd1 Nc6 6.Nxe4 Nxe5, or 5.Nxd1 Nc6 6.Bf4, with equality and few winning chances for either side.[46] Since these positions typically do not attract gambiteers, White often chooses a riskier response in order to generate winning chances, such as 4.Qh5, 4.Nge2 or 4.Nxe4. Both 4.Qh5 and 4.Nge2 are well met by 4...Nc6!, when Black has good chances of obtaining an advantage, while against 4.Nxe4 the most critical continuation is 4...Qxd4, when White can continue with either 5.Qe2 or 5.Bd3, with complications and some compensation for the pawn in either case, but it is unclear if it is enough.[47]
Other options for Black[edit]3...f5 is an important option for Black, since 4.f3 is well met by 4...e5!, with some advantage for Black. Instead White does better to prevent ...e5 with 4.Bf4, and then obtain compensation for a pawn with a subsequent f3.[48] 3...Bf5 is well met by 4.f3, and if 4...exf3 then 5.Qxf3 attacking the bishop (thus Black may be better off transposing to the Vienna Defence with 4...Nf6).[49] 3...c6 and 3...e6 transpose to the Caro–Kann Defence and French Defence respectively, and in the former case White can continue in Blackmar–Diemer Gambit style with 4.f3 or 4.Bc4 intending 5.f3 (which often transposes to the O'Kelly Defence). After 3...e6, however, White cannot easily force a Blackmar–Diemer Gambit type position as 4.f3 Bb4 (which also comes up via the French Rubinstein Variation) is very bad for White.
Another option for White is to play the Veresov Opening moves – without 3.Bg5. If Black responds with the Alburt Defence after 1. d4 d5 2. Nc3 Bf5 it can transpose into a type of BDG Zeller Defence after 3. e4 dxe4. A new line only recently mentioned in Tim Sawyer's Blackmar–Diemer Books 5 and 8, is the Torning Gambit which occurs after 4. g4 Bg6 5. Qe2!? If Black gets greedy and captures 5...Qxd4, White gets a nice game after 6.Qb5+. Tim Sawyer's books mention several games played by Richard Torning who originally played this gambit in the 1980s. A trap is Richard Torning (1809) – amol52 (1424) [D00] (bullet 18.12.2016): 1.d4 d5 2.Nc3 Bf5 3.e4 dxe4 4.g4 Bg6 5.Qe2 Qxd4 6.Qb5+!? Qd7?? 7.Qxb7 Qc6 8.Qc8#.[50][51]
this is from wikipedia
I don't have every opening memorized, but I want to source where I got my info from