Elephant Gambit

The Elephant Gambit (also called the Queen's Pawn Countergambit or Englund Counterattack) is a rarely played chess opening beginning with the moves:
Although the Elephant Gambit is considered unsound, it has been used frequently by the Barbadian master Philip Corbin.
Lines.
White is able to capture either of Black's center pawns with the advantage, either by 3.exd5 or 3.Nxe5. With a center pawn removed, Black is in a passive position with White clearly having the initiative as White controls more .
3.exd5.
Black's responses to 3.exd5 include 3...e4 and 3...Bd6 (the Elephant Gambit proper). 3...Qxd5 saves the pawn, but leaves White with a big lead in after 4.Nc3.
3...e4.
After 3...e4 4.Qe2 Nf6 lines might continue: 
After 3...e4 4.Qe2, Tal–Lutikov, Tallinn 1964 continued 4...f5 5.d3 Nf6 6.dxe4 fxe4 7.Nc3 Bb4 8.Qb5+ c6 9.Qxb4 exf3 with 10.Bg5 cxd5 11.0-0-0 Nc6 with advantage for White.
Elephant Gambit proper: 3...Bd6.
After 3...Bd6 4.d4 e4 5.Ne5 Nf6 6.Nc3 0-0 7.Bc4, according to de Firmian, White enjoys a distinct superiority but no immediate attack.
3.Nxe5.
After 3.Nxe5:
References.
Bibliography