Boden-Kieseritzky Gambit is the opening where white gives up the key central pawn and gets on with the development of his pieces. If black tries to hold on to the pawn then a dangerous attack ensues by white. Hence under favorable situation the pawn has to be given back or if able to outsmart white and hold onto the pawn ,the endgame then favors black.
1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3 Nxc3 5.dxc3 f6 6.Nh4 g6 7.f4 Qe7 8.f5 Qg7 9.fxg6 hxg6 10.Qg4 Kd8 11.Qg3 g5 12.Nf5 Qh7 13.0-0 c6 14.Bd3 d5
An opportunity for white to create a threat.
Opening up the white queen’s diagonal and thus allowing white to implement his attack
16.Rxf6 exd3 17.Bxg5 Be7 18.Nf7+
In the Oxford variation,Bishop variation,Breyer Variation,Three Knight's Variation, Boden-Kieseritzky Gambit,Alekhine Variationand Reversed Spanish Opening,unlike some of the previous openings these can be played even in longer formats of the game as they are less riskier and positional to be played and hence played more by the high level of chess players.