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

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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

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