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
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) r1bqkb1r/pppp1ppp/2n2n2/8/2BpP3/5N2/PPP2PPP/RNBQ1RK1

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

When contributing to this Wikibook, please follow the conventions for organization.

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

When contributing to this Wikibook, please follow the Conventions for organization.