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Chess Opening Theory/1. e4/1...e5/2. Nc3/2...Nc6/3. f4
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Vienna Gambit rd bd qd kd bd nd rd pd pd pd pd pd pd pd nd pd pl pl nl pl pl pl pl pl pl rl bl ql kl bl nl rl
Vienna Gambit
A positional approach to the King's Gambit—White first brings the queenside knight out to Nc3, then intends to play f4 to divert Black's e-pawn.
Black's symmetrical ...Nc6 defends the center but doesn't help advance ...d5, while White has an easier time advancing the d-pawn to d4: If Black accepts the gambit with 3...exf4, the e5-pawn disappears and White's d-pawn gains a clear path forward. White can later push d5, kicking Black's knight on c6 to an awkward square.
Theory table
.
1. e4 e5 2.Nc3 Nc6 3. f4
3
4
f4exf4
Nf3g5
=
...Bc5
Nf3d6
+=
...d6
References
Vienna Game