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

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Two Knights Defence - Classical Variation
a b c d e f g h
8a8 black rookb8 black kingc8 black bishopd8 black queene8 black kingf8 black bishopg8 black kingh8 black rook8
7a7 black pawnb7 black pawnc7 black pawnd7 black pawne7 black kingf7 black pawng7 black pawnh7 black pawn7
6a6 black kingb6 black kingc6 black knightd6 black kinge6 black kingf6 black knightg6 black kingh6 black king6
5a5 black kingb5 black kingc5 black kingd5 black kinge5 black pawnf5 black kingg5 black kingh5 black king5
4a4 black kingb4 black kingc4 white bishopd4 white pawne4 white pawnf4 black kingg4 black kingh4 black king4
3a3 black kingb3 black kingc3 black kingd3 black kinge3 black kingf3 white knightg3 black kingh3 black king3
2a2 white pawnb2 white pawnc2 white pawnd2 black kinge2 black kingf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 white knightc1 white bishopd1 white queene1 white kingf1 black kingg1 black kingh1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)

r1bqkb1r/pppp1ppp/2n2n2/4p3/2BPP3/5N2/PPP2PPP/RNBQK2R b

Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4

Two Knights Defence - Classical Variation

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4. d4

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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

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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

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 +/=

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References

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