Updated: Feb 12
In the Omaha Gambit, black does not develop his dark squared bishop and white tries to take advantage of it and expands on the kingside by moving his f pawn into the attack. Though it may seem that white seems to be dangerously expanding with the f pawn, the absence of bishop on the forward position helps white in implementing this idea.
1.e4 d6 2.Nc3 e5 3.f4 exf4 4.Nf3 Ne7 5.d4 Ng6 6.Bd3 Be7 7.0-0 Nd7 8.Nd5 Ndf8 9.Qe1 Ne6 10.Nxe7 Qxe7 11.h4 0-0 12.h5 Nh8 13.e5 d5 14.c4 dxc4 15.Bxc4 Rd8 16.Bxe6 Qxe6 17.Qh4 Rd5 18.Bxf4 Qg4 19.Rac1 Qxh4 20.Nxh4 c6 21.Be3 Rb5 22.b3 h6 23.Rc3 Ra5 24.a4 Rd5 25.Nf5 Bxf5 26.Rxf5 Re8 27.g4 Re6 28.Kg2 a6 29.Kg3 g6 30.Rf3 gxh5 31.gxh5 f6 32.Rxf6 Rxf6 33.exf6 Rxh5 34.Kg4 Rd5 35.Bxh6 Rxd4+ 36.Kf3
The turning point of the game where white starts to slowly misplay his position.
Kf7 37.Be3 Rd6 38.Bg5 Rd5 39.Kg4 Kg6 40.Bh4 Nf7 41.Kf3 Rh5 42.Bg3 Kxf6 43.Re3 Rd5 44.Ke2 Ne5 45.Re4 Nd3
White’s pawns are weak and after the rook exchange slowly looses both pawns on the queen side.
46.Re3 Nc1+ 47.Kf3 Kf5 48.Bb8 Rd4 49.Rc3 Rd3+ 50.Rxd3 Nxd3 51.Ke3 Nc5 52.Kd4 Nxb3+ 53.Kc4 Nc1 54.a5 Ke4 55.Kc5 Kd3 56.Be5 Nb3+ 57.Kb4 Nd2 58.Kc5 Ne4+
And white resigned as black captures the remaining last pawn by still holding on to the two pawns where white may have to sacrifice the bishop for a single pawn.
In the Omaha Gambit,white goes for the least non risky line where it is observed that the rule of safety of the king is followed and white might just be able to prevent the immediate onslaught of an attack on his king. So it is a much comfortable and an aggressive approach by white to be played similar to the King's Gambit Opening.