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Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. d4/4...exd4

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Two Knights Defence - Classical
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Position in Forsyth-Edwards Notation (FEN)

r1bqkb1r/pppp1ppp/2n2n2/8/2BpP3/5N2/PPP2PPP/RNBQK2R w

Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4

Two Knights Defence - Classical Variation

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4...exd4

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Black plays exd4. Black is a pawn up but has a number of weaknesses the square e5, the Knight on f6 that can be pinned and also the weak f7 square. This all adds up to giving White a number of options. They are.

  • 5. O-O the classical variation.
  • 5. e5 the modern variation.
  • 5. Ng5 a misguided direct attack on f7.
  • 5. Nxd4 rather normal move.
  • 5. Bg5 pinning the Knight, but the pin can soon be undone, leaving no advantage for White.
  • 5. Qe2 this supports e5, although e5 can be played immediately anyway.
  • 5. c3 fails to 5...Nxe4 where Black has the nice d5 available and time to block any pins on the e-file against the King.

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.d4 exd4


5
6
7
8
9
10
1 O-O
Nxe4		 Re1
d5		 Bxd5
Qxd5		 Nc3
Qh5		 Nxe4
Be6		 Bg5
Bd6		 =
2 ...
Bc5		 e5
d5		 exf6
dxc4		 Re1+
Be6		 Ng5
Qd5		 Nc3
Qf5		 =
3 e5
d5		 Bb5
Ne4		 Nxd4
Bd7		 Bxc6
bxc6		 O-O
Bc5		 Be3
Qe7		 =
4 Ng5
d5		 exd5
Qe7+		 Kf1
Ne5		 Qxd4
Nxc4		 Qxc4
h6		 Nf3
Qc5		 =
5 Nxd4
Nxe4		 Bxf7+
Kxf7		 Qxh5+
g6		 Qd5
Kg7		 Nxc6
bxc6		 Qxe4
Qe8		 =
6 Bg5
Be7		 O-O
O-O		 =
7 Qe2
Bc5		 e5
O-O		 O-O
d5		 =/+
8 c3
Nxe4		 =/+

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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.


v · t · e
Chess openings quick reference
1. e4
1...e5 · Open
2. Nf3
With 2...Nc6:
Four knights: (
)
Italian game: (
)
Spanish game: (
)

With other 2nd moves:
2. Other

1...c5 · Sicilian
2... Nf3 · Open Sicilian
With 2...Nc6:

With 2...d6:

With 2...e6:

With other 2nd moves:
Anti-Sicilians
1... other
Caro-Kann
French
Other


1. d4
1...d5 · Closed
2. c4
2. Nc3
2. other
1...Nf6 · Indian
2. c4
With 2...e6:

With 2...g6:

With other 2nd moves for Black:
2. Nf3
2. other
1... other
Flank
Unorthodox
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