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

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< Chess Opening Theory‎ | 1. e4‎ | 1...e5‎ | 2. f4‎ | 2...exf4‎ | 3. Nf3‎ | 3...g5‎ | 4. h4
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King's Knight Gambit
a b c d e f g h
8{{{square}}} black rook{{{square}}} black knight{{{square}}} black bishop{{{square}}} black queen{{{square}}} black king{{{square}}} black bishop{{{square}}} black knight{{{square}}} black rook8
7{{{square}}} black pawn{{{square}}} black pawn{{{square}}} black pawn{{{square}}} black pawn{{{square}}} black king{{{square}}} black pawn{{{square}}} black king{{{square}}} black pawn7
6{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king6
5{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king5
4{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} white pawn{{{square}}} black pawn{{{square}}} black pawn{{{square}}} white pawn4
3{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} white knight{{{square}}} black king{{{square}}} black king3
2{{{square}}} white pawn{{{square}}} white pawn{{{square}}} white pawn{{{square}}} white pawn{{{square}}} black king{{{square}}} black king{{{square}}} white pawn{{{square}}} black king2
1{{{square}}} white rook{{{square}}} white knight{{{square}}} white bishop{{{square}}} white queen{{{square}}} white king{{{square}}} white bishop{{{square}}} black king{{{square}}} white rook1
a b c d e f g h

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 her lost pawn and leaving Black with weak pawns on f4, f7 and h7. But while that knight is going on a tour of the board, Black is catching up on development with moves like ...d6 and ...Nf6, and even if Black does end up with doubled isolated f-pawns, the one on f4 is going nowhere and remains a thorn in White's side.
  • 5. Ng5 is the Allgaier Gambit. Black can now trap the knight with 5...h6, forcing it to sacrifice itself on f7 to displace the Black king. How well this typically works can be illustrated by the fact that the Kieseritsky Gambit is statistically one of the most terrible openings in the White repertoire, but it's still about ten times as popular as the Allgaier Gambit.

5.Nd4 is just going to give away a tempo to 5...Bg7, and 5.Nh2 undefends h4 with dire consequences.

Theory table[edit]

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

5 6
Kieseritzky Gambit Ne5
Nf6
Allgaier Gambit Ng5
h6
Nxf7
Kxf7

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References[edit]