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Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...d5

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Two knights defence
a
b
c
d
e
f
g
h
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
a
b
c
d
e
f
g
h
Position in Forsyth-Edwards Notation (FEN)
r1bqkb1r/ppp2ppp/2n2n2/3pp1N1/2B1P3/8/PPPP1PPP/RNBQK2R
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5
ECO code: C57
Parent: Two knights defence → 4. Ng5

4...d5

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This is a pawn sacrifice, but it is necessary for Black to defang White's attack on f7.

White must capture the pawn, 5. exd5.

Any other move loses material, for instance retreating the bishop 5. Bb3? Nxe4!.

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
4 5
Ng5
d5		 exd5
-
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References

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See also

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v · t · e
Chess Opening Theory
1. e4 e5
Open games
2. Nf3
2...Nc6
3. Bb5
Spanish
3. Bc4
Italian
3. Nc3
Three knights
Other
2...Nf6
Russian
2...d6
Philidor
Other
2. f4
King's gambit
2...exf4
Accepted
Other
Declined
2. Nc3
Vienna
Other
1. e4 c5
Sicilian
2. Nf3
2...Nc6 3. d4 cxd4 4. Nxd4
2...Nc6 other
2...d6 3. d4 cxd4 4. Nxd4
2...d6 other
2...e6 3. d4 cxd4 4. Nxd4
2...e6 other
Others
Anti-Sicilians
1. e4 e6
French
1. e4 c6
Caro-Kann
1. e4 other
1. d4 d5
Closed games
2. c4
Queen's gambit
2. Nc3
2. other
1. d4 Nf6
Indian
2. c4 e6
2. c4 g6
2. c4 other
2. Nf3
2. other:
1. d4 f5
Dutch
1. d4 ...other:
1. Nf3
Zukertort
Flank
Unorthodox
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