Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...d5/5. exd5/5...Nd4/6. c3/6...b5/7. Bf1/7...Nxd5/8. Ne4/8...Qh4/9. Ng3

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< Chess Opening Theory‎ | 1. e4‎ | 1...e5‎ | 2. Nf3‎ | 2...Nc6‎ | 3. Bc4‎ | 3...Nf6‎ | 4. Ng5‎ | 4...d5‎ | 5. exd5‎ | 5...Nd4‎ | 6. c3‎ | 6...b5‎ | 7. Bf1‎ | 7...Nxd5‎ | 8. Ne4‎ | 8...Qh4
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Two Knights Defence:Fritz variation
a b c d e f g h
8a8 black rookb8 black kingc8 black bishopd8 black kinge8 black kingf8 black bishopg8 black kingh8 black rook8
7a7 black pawnb7 black kingc7 black pawnd7 black kinge7 black kingf7 black pawng7 black pawnh7 black pawn7
6a6 black kingb6 black kingc6 black kingd6 black kinge6 black kingf6 black kingg6 black kingh6 black king6
5a5 black kingb5 black pawnc5 black kingd5 black knighte5 black pawnf5 black kingg5 black kingh5 black king5
4a4 black kingb4 black kingc4 black kingd4 black knighte4 black kingf4 black kingg4 black kingh4 black queen4
3a3 black kingb3 black kingc3 white pawnd3 black kinge3 black kingf3 black kingg3 white knighth3 black king3
2a2 white pawnb2 white pawnc2 black kingd2 white pawne2 black kingf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 white knightc1 white bishopd1 white queene1 white kingf1 white bishopg1 black kingh1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)

r1b1kb1r/p1p2ppp/8/1p1np3/3n3q/2P3N1/PP1P1PPP/RNBQKB1R b

Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nd4 6. c3 b5 7. Bf1 Nxd5 8. Ne4 Qh4 9. Ng3

Two Knights Defence:Fritz variation

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9 Ng3
The Knight comes to add protection against the Black Queen. Black's Knight on d4 is now vulnerable, but Black having more development can aggressively create threats. The choice is to move the d4 Knight or create further complications, for a long time 9...Bg4 was consider good but later analysis has indicated that with correct play White has a clear plus.

Theory table

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

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 b5 6.Bf1 Nd4 7.c3 Nxd5 8.Ne4 Qh4
9 10 11 12
Ng3
Nc6		 Bxb5
Bb7		 O-O
O-O-O		 ∞
...
Ne6		 Bxb5
Kd8		 d4
Bb7		 dxe5
Kc8		 +/-
...
Bb7		 cxd4
O-O-O		 Be2
Nf4		 O-O
Rxd4		 +/-
...
Bg4		 f3
e4		 cxd4
Bd6		 Bxb5+
Kd8		 +/-

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References

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  • Nunn's Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. ISBN 1-8574-4221-0.

Wikipedia has related information at Two Knights Defence

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