ECO: A04
An opening move in chess begining with White moving his g1 Knight to f3. This is a risky common variant of the King's Indian Attack:
1.Nf3 f5
This is the Dutch Defense if White plays d2-d4, but may lead to offbeat gambits with e2-e4 or even g2-g4.
Variations:
Lisitsin Gambit
1.Nf3 f5
2.e4
A strong gambit, trying to open the position quickly to take advantage of the weakened h5-e8 diagonal. White will meet ...f5xe4 with Nf3-g5 with active play.
Lisitsin Gambit Diferred
1.Nf3 f5
2.d3 Nf6
3.e4
Labeled the Improved Lisitsin Gambit, White aims for the continuation 2...Nf6 3.e4 fxe4 4.dxe4 Nxe4 5.Bd3 Nf6 6.Ng5 where White has improved attacking prospects over the Lisitsin Gambit proper (1.Nf3 f5 2.e4!?), where Black has a satisfactory defense.