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OPENINGS THEORY
- ECO CODES BASE -

- D40 -

[D40-a] - QGD:
Semi-Tarrasch defence
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5

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[D40-b] - QGD:
Semi-Tarrasch defence,
Pillsbury variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.Bg5 (see [D-50])

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[D40-c] - QGD:
Semi-Tarrasch defence
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3

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[D40-d] - QGD:
Semi-Tarrasch defence
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Be7

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[D40-e] - QGD:
Semi-Tarrasch defence
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 a6

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[D40-f] - QGD:
Semi-Tarrasch defence
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6

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[D40-g] - QGD:
Semi-Tarrasch defence
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.Bd3

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[D40-h] - QGD:
Semi-Tarrasch defence
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6

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[D40-i] - QGD:
Semi-Tarrasch defence
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6
7.0-0

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[D40-j] - QGD:
Semi-Tarrasch defence,
symmetrical variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6
7.0-0 0-0

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[D40-k] - QGD:
Semi-Tarrasch defence
symmetrical variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6
7.0-0 0-0 8.Qe2 Qe7 9.dxc5 (SRM)
(SRM: (symmetry rupture move))

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[D40-l] - QGD:
Semi-Tarrasch defence,
Levenfish variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6
7.0-0 0-0 8.Qe2 Qe7 9.dxc5 (SRM)
(SRM: (symmetry rupture move))
Bxc5 11.e4

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[D40-m] - QGD:
Semi-Tarrasch defence,
6.a3 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 (b6?!)

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[D40-n] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...Be7
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 Be7

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[D40-o] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...Be7
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 Be7
7.dxc5 Bxc5

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[D40-p] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...dxc4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 dxc4

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[D40-q] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...dxc4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 dxc4
7.Bxc4

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[D40-r] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...dxc4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 dxc4
7.Bxc4 a6

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[D40-s] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...dxc4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 dxc4
7.Bxc4 a6 8.0-0 b5 (BIQS)
(BIQS: (Black initiative
on the Queen's side))

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[D40-t] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...Ne4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 Ne4
(PKC: (pawns-Knights complex))

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[D40-u] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...Ne4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 Ne4 (PKC)
7.Bd3

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[D40-v] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...Ne4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 Ne4 (PKC)
7.Qc2 (SP: (strategical position))

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[D40-w] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...Ne4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 Ne4 (PKC)
7.Qc2 (SP) Nxc3 8.bxc3 Be7 =/=

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[D40-x] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...cxd4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 cxd4

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[D40-y] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...cxd4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 cxd4
7.exd4

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[D40-z] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...cxd4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 cxd4
7.exd4 Be7

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[D40-a*] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...cxd4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 cxd4
7.exd4 Ne4 (PKC) =

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[D40-b*] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...cxd4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 cxd4
7.exd4 Ne4 (PKC) 8.Bd3 =

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[D40-c*] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...cxd4
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 cxd4
7.exd4 Ne4 (PKC) 8.Bd3 Nxc3
9.bxc3 dxc4 10.Bxc4

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[D40-d*] - QGD:
Semi-Tarrasch defence,
6.a3 variation, 6...cxd4,
main line (12.Qe3)
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 cxd4
7.exd4 Ne4 (PKC) 8.Bd3 Nxc3
9.bxc3 dxc4 10.Bxc4 Be7 11.0-0 0-0
12.Qd3!? =

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[D40-e*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6

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[D40-f*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.cxd5 exd5

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[D40-g*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.dxc5 Bxc5

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[D40-h*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.dxc5 Bxc5 8.b4 (OIQS)
((OIQS: (opposite initiatives
on the Queen's side))

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[D40-i*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.dxc5 Bxc5 8.b4 (OIQS)

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[D40-j*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.dxc5 Bxc5 8.b4 (OIQS) Ba7

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[D40-k*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.dxc5 Bxc5 8.b4 (OIQS) Bd6

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[D40-l*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.dxc5 Bxc5 8.b4 (OIQS) Bd6 9.cxd5
exd5 (ICP: (isolated central pawn))

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[D40-m*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.dxc5 Bxc5 8.b4 (OIQS) Bd6 9.cxd5
exd5 (ICP) 10.Bb2 (d4=CP) 0-0

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[D40-n*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.dxc5 Bxc5 8.b4 (OIQS) Bd6 9.cxd5
exd5 (ICP) 10.Bb2 (d4=CP) 0-0 11.Be2
Be6 12.0-0 (Qe7) (unclear)

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[D40-o*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation, 7.b3 line
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.b3

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[D40-p*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation, 7.b3 line
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.b3 Be7

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[D40-q*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation, 7.b3 line
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.b3 Be7 8.Bb2 0-0

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[D40-r*] - QGD:
Semi-Tarrasch defence,
6.a3 a6 variation, 7.b3 line
1.d4 d5 2.c4 e6 3.Nc3 Nf6
4.Nf3 c5 5.e3 Nc6 6.a3 a6
7.b3 Be7 8.Bb2 0-0 9.Bd3 (cxd4) =

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