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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
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Two Knights Defence: Classical Variation rd bd qd kd bd rd pd pd pd pd pd pd pd nd nd bl pd pl nl pl pl pl pl pl pl rl nl bl ql rl kl
Two Knights Defence: Classical Variation
5. O-O
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
.
1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4.d4 exd4 5. O-O
5
6
7
8
9
10
1
O-ONxe4
Re1d5
Bxd5Qxd5
Nc3Qh5
Nxe4Be6
Bg5Bd6
2
...Bc5
e5d5
exf6dxc4
Re1+Be6
Ng5Qd5
Nc3Qf5
3
...d6
Nxd4Be7
Nc3O-O
Re1Bd7
f4Nxd4
Qxd4c6
+/=
4
...Be7
Nxd4d6
Transposes to above line
References
Two Knights Defence