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

< Chess Opening Theory‎ | 1. e4‎ | 1...e5‎ | 2. Nf3‎ | 2...Nc6‎ | 3. Bc4‎ | 3...Nf6
Two Knights Defence - Classical Variation
 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

## Two Knights Defence - Classical Variation

### 4. d4

This aggressive move frees White's queenside bishop and adds pressure on the center. However, the e4-pawn is left undefended and that gives Black some options to establish a stable center.
• 4...exd4 is Black's only credible answer.
• 4...Nxe4 can be meet with 5. dxe5 when White threatens Bxf7+ or Qd5 attacking both the e4-knight and f7.
• 4...Nxd4 with Nxe5 undermining the knight on d4.
• 4...Bd6? blockades Black's d-pawn and allows White to take on e5.

## 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

4

5

6

7

8

9

10
1 d4
exd4
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 ...
Nxd4
Nxe5
Ne6
O-O +/=
5 ...
Nxe4
dxe5
d6
Bxf7
Kxf7
Qd5+
Be6
Qxe4 +/=
6 ...
Bd6
O-O
exd4
e5 +/=