OPENINGS THEORY
- ECO CODES BASE -

- D41 -

[D41-a] - QGD: Semi-Tarrasch, 5.cxd5 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5

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[D41-b] - QGD: Semi-Tarrasch, 5.cxd5 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 cxd4

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[D41-c] - QGD: Semi-Tarrasch, 5.cxd5 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 cxd4 6.Qa4+

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[D41-d] - QGD: Semi-Tarrasch, 5.cxd5 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5

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[D41-e] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3

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[D41-f] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6

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[D41-g] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7

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[D41-h] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0

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[D41-i] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation, 9.Rb1 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.Rb1

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[D41-j] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.Rb1 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.Rb1 Bf6 (a1-h8=CD)

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[D41-k] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.Rb1 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.Rb1 Bf6 (a1-h8=CD)10.e3 (d4=CP) (cxd4)

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[D41-l] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.Nxd5 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.Nxd5

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[D41-m] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.Nxd5 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.Nxd5 exd5

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[D41-n] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.Nxd5 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.Nxd5 exd5 10.dxc5 Bxc5 (d5=IP) =/unclear

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[D41-o] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.e4 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.e4

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[D41-p] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.e4 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.e4 Nb6

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[D41-q] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.e4 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.e4 Ndb4

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[D41-r] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.e4 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.e4 Nxc3

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[D41-s] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.e4 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.e4 Nxc3 10.bxc3 (cxd4)

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[D41-t] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.e4 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.e4 Nxc3 10.bxc3 cxd4 11.cxd4

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[D41-u] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.e4 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.e4 Nxc3 10.bxc3 cxd4 11.cxd4 b6 (SAWCE: (strategy again White's centre))

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[D41-v] - QGD: Semi-Tarrasch, 5.cxd5 6.g3 variation 9.e4 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.e4 Nxc3 10.bxc3 cxd4 11.cxd4 b6 (SAWCE) 12.d5

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[D41-w] - QGD: Semi-Tarrasch, 5.cxd5 6.e4 variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4

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[D41-x] - QGD: Semi-Tarrasch, 5.cxd5 6.e4 variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3

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[D41-y] - QGD: Semi-Tarrasch, 5.cxd5 6.e4 variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4

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[D41-z] - QGD: Semi-Tarrasch, 5.cxd5 6.e4 variation, 8...Be7 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Be7

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[D41-a*] - QGD: Semi-Tarrasch, 5.cxd5 6.e4 variation, 8...Nc6 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Nc6 (9.Bc4)

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[D41-b*] - QGD: Semi-Tarrasch, 5.cxd5 6.e4 variation, 8...Nc6 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Nc6 9.Bc4 b5!? (IP: (indirect protection))

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[D41-c*] - QGD: Semi-Tarrasch, 5.cxd5 6.e4 variation, 8...Bb4+ line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+

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[D41-d*] - QGD: Semi-Tarrasch, 5.cxd5 6.e4, 8...Bb4+ line San Sebastian variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Qa5?!

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[D41-e*] - QGD: Semi-Tarrasch, 5.cxd5 6.e4 variation, 10...0-0 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0

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[D41-f*] - QGD: Semi-Tarrasch, 6.e4, 10...0-0, Kmoch variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Bb5 (b6)

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[D41-g*] - QGD: Semi-Tarrasch, 6.e4 variation, 10...0-0 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Rc1 (OF: (open file))

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[D41-h*] - QGD: Semi-Tarrasch, 6.e4 variation, 10...0-0 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Rc1 (OF) Nc6

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[D41-i*] - QGD: Semi-Tarrasch, 6.e4 variation, 10...0-0 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Be2 (b6 (SAWCE))

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[D41-j*] - QGD: Semi-Tarrasch, 6.e4 variation, 10...0-0 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Be2 Nc6

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[D41-k*] - QGD: Semi-Tarrasch, 6.e4 variation, 10...0-0 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Bc4 (Nd7)

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[D41-l*] - QGD: Semi-Tarrasch, 6.e4 variation, 10...0-0 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Bc4 Nc6

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[D41-m*] - QGD: Semi-Tarrasch, 6.e4 variation, 10...0-0 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Bc4 Nc6 12.0-0 b6 (OICE:(opposite initiatives on the centre))

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[D41-n*] - QGD: Semi-Tarrasch, 6.e4 variation, 10...0-0 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Bc4 Nc6 12.0-0 b6 (OICE) 13.Rad1 (or Rfd1) Bb7 +/=

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[D41-o*] - QGD: Semi-Tarrasch, 5.cxd5 6.e3 variation 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3

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[D41-p*] - QGD: Semi-Tarrasch, 5.cxd5 6.e3 variation, 6...Be7 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Be7

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[D41-q*] - QGD: Semi-Tarrasch, 5.cxd5 6.e3 variation, 6...Nc6 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Nc6

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[D41-r*] - QGD: Semi-Tarrasch, 5.cxd5 6.e3 variation, 6...Nc6 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bc4 cxd4 8.exd4

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[D41-s*] - QGD: Semi-Tarrasch, 5.cxd5 6.e3 variation, 6...Nc6 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bc4 cxd4 8.exd4 Be7 9.0-0 0-0

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[D41-t*] - QGD: Semi-Tarrasch, 5.cxd5 6.e3 variation, 6...Nc6 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bc4 cxd4 8.exd4 Be7 9.0-0 0-0 10.Re1 (OF) (a6)

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[D41-u*] - QGD: Semi-Tarrasch, 5.cxd5 6.e3 variation, 6...Nc6 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bc4 cxd4 8.exd4 Be7 9.0-0 0-0 10.Re1 (OF) Nxc3

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[D41-v*] - QGD: Semi-Tarrasch, 5.cxd5 6.e3 variation, 6...Nc6 line 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bc4 cxd4 8.exd4 Be7 9.0-0 0-0 10.Re1 (OF) Bf6

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