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
a b c d e f g h
8 a8 b8 c8 d8 e8 f8 g8 h8 8
7 a7 b7 c7 d7 e7 f7 g7 h7 7
6 a6 b6 c6 d6 e6 f6 g6 h6 6
5 a5 b5 c5 d5 e5 f5 g5 h5 5
4 a4 b4 c4 d4 e4 f4 g4 h4 4
3 a3 b3 c3 d3 e3 f3 g3 h3 3
2 a2 b2 c2 d2 e2 f2 g2 h2 2
1 a1 b1 c1 d1 e1 f1 g1 h1 1
a b c d e f g h
Position in Forsyth-Edwards Notation(FEN)

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

Two Knights Defence - Classical Variation[edit]

4...exd4[edit]

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[edit]

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[edit]

  • Nunn's Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. ISBN 1-8574-4221-0.
  • Batsford Chess Openings 2 (1989, 1994). Garry Kasparov, Raymond Keene. ISBN 0-8050-3409-9.