Chess Opening Theory/1. e4/1...e5/2. f4/2...exf4/3. Nf3/3...g5/4. h4/4...g4

King's Knight Gambit

	a	b	c	d	e	f	g	h
8									8
7									7
6									6
5									5
4									4
3									3
2									2
1									1
	a	b	c	d	e	f	g	h

Common moves:
5. Ne5 - Kieseritzky Gambit
5. Ng5 - Allgaier Gambit

White's knight is attacked. Although there are some King's Gambit positions where White can ignore this attack and carry on developing, this isn't one of them.

• 5. Ne5 is the Kieseritzky Gambit, which can be considered the main line of the whole King's Gambit. White targets f7 and g4, in the hope of recovering the sacrificed pawn and leaving Black with weak pawns on f4, f7 and h7. However, as White is repeatedly moving the knight, Black can catch up on development with moves like ...d6 and ...Nf6. Even if Black does end up with doubled isolated f-pawns, the one on f4 will remain a thorn in White's side.
• 5. Ng5 is the Allgaier Gambit. White allows Black to trap the knight with 5...h6, planning 6.Nxf7, weakening the Black king. It is considered unsound.

5.Nd4 and 5.Ng1 hinder White's development. 5.Nh2 leaves the h4-pawn undefended.

For explanation of theory tables, see theory table and for notation, see algebraic notation..

1.e4 e5 2.f4 exf4 3.Nf3 g5 4. h4 g4

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Wikipedia has related information at King's Gambit

• Fundamental Chess Openings (2009). Paul van der Sterren. ISBN 1-906454-13-2.

• The King's Gambit (2013). John Shaw. ISBN 978-1-906552-71-8.

• "The King's Gambit". The Gambiteer's Guild. Retrieved 25 Jul 2014.