Tennison Gambit

The Tennison Gambit is a chess opening in which White gambits a pawn. The "ECO" code is A06, and the opening moves begin with either the Réti Opening:
or the Scandinavian Defense:
History.
The first person to significantly research this opening was chess amateur Otto Mandrup Tennison (1834–1909). Tennison was born in Denmark, studied in Germany and moved to the United States in 1854. There he played in the chess clubs of New Orleans. Many strong players picked up the idea from the first half of the 20th century.
After 2...dxe4 3.Ng5.
3... e5 (White had the advantage in Ermenkov–Bonchev, Bulgaria 1970, after 3...Nf6 4.Bc4 e6 5.Nc3 a6 6.Ngxe4 Nxe4 7.Nxe4 b5 8.Be2 Bb7 9.Bf3) 4. Nxe4 f5! favors Black.
Notable games.
Otto M. Tennison vs. , New Orleans 1891 
If 11...Qc6 then 12.Qb3+ Ka6 13.Nc3 any 14.Bxb7+; 11...e6 12.a3, etc. (Tennison) 