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OPENINGS THEORY
- ECO CODES BASE -

- C49 -

[C49-a] - Four knights:
double Ruy Lopez
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4

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[C49-b] - Four knights:
double Ruy Lopez
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0

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[C49-c] - Four knights:
Gunsberg counter-attack
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.Nd5 Nxd5
7.exd5 e4

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[C49-d] - Four knights:
double Ruy Lopez
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3

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[C49-e] - Four knights:
Alatortsev variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 Qe7
7.Ne2 d5

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[C49-f] - Four knights
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 Bxc3

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[C49-g] - Four knights:
Janowski variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 Bxc3
7.bxc3 d6 8.Re1

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[C49-h] - Four knights:
Svenonius variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 Bxc3
7.bxc3 d5

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[C49-i] - Four knights:
symmetrical variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 d6

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[C49-j] - Four knights:
symmetrical, Metger unpin
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 d6
7.Bg5 Bxc3 8.bxc3 Qe7

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[C49-k] - Four knights:
symmetrical, Capablanca variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 d6
7.Bg5 Bxc3 8.bxc3 Qe7 9.Re1 Nd8
10.d4 Bg4

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[C49-l] - Four knights:
symmetrical, Pillsbury variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 d6
7.Bg5 Ne7

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[C49-m] - Four knights:
symmetrical, Blake variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 d6
7.Bg5 Ne7 8.Nh4 c6 9.Bc4 d5
10.Bb3 Qd6

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[C49-n] - Four knights:
symmetrical, Tarrasch variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 d6
7.Bg5 Be6

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[C49-0] - Four knights:
symmetrical, Maroczy system
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.d3 d6
7.Ne2

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[C49-p] - Four knights:
Nimzovich (Paulsen) variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
4.Bb5 Bb4 5.0-0 0-0 6.Bxc6

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