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Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. d4/4...exd4/5. O-O

Two Knights Defence: Classical Variation
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Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O

Two Knights Defence: Classical Variation

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5. O-O

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The classical variation. Castling both gives the White King some security and activates the rook to be able to come to e1 which has much potential to support the White e-pawn or pin any pieces that take the e-pawn. Black's possible sensible replies are:

  • 5....Nxe4
  • 5....Bc5
  • 5....d6
  • 5....Be7

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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. O-O

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 ...
d6
Nxd4
Be7
Nc3
O-O
Re1
Bd7
f4
Nxd4
Qxd4
c6
+/=
4 ...
Be7
Nxd4
d6




Transposes to above line

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References

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

With other 2nd moves:
2. Other
1... other
1. d4
Flank
Unorthodox