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

< Chess Opening Theory‎ | 1. e4‎ | 1...e5‎ | 2. Nf3‎ | 2...Nc6‎ | 3. Bc4‎ | 3...Nf6‎ | 4. d4
Two Knights Defence - Classical
 a b c d e f g h 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4

# Two Knights Defence - Classical Variation

### 4...exd4

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

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
=/+