OPENINGS THEORY
- ECO CODES BASE -

- E25 -



[E25-a] - NID: Nimzo-
Indian: Samisch variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 /unclear


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[E25-b] - NID: Nimzo-
Indian: Samisch variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 exd5


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[E25-c] - NID: Nimzo-
Indian: Samisch variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 exd5
8.e3 0-0


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[E25-d] - NID: Nimzo-
Indian: Samisch variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 exd5
8.e3 0-0 9.Bd3 (FL: (free line))


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[E25-e] - NID: Nimzo-
Indian: Samisch variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5


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[E25-f] - NID: Nimzo-
Indian: Samisch variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.Qd3 =


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[E25-g] - NID: Nimzo-
Indian: Samisch variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.Qd2 =


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[E25-h] - NID: Nimzo-
Indian: Samisch variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.Qd2 Qa5 =


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[E25-i] - NID: Nimzo-Indian:
Samisch, Keres variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5


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[E25-j] - NID: Nimzo-Indian:
Samisch, Keres variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 Qh4+ 9.g3


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[E25-k] - NID: Nimzo-Indian:
Samisch, Keres variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 Qa5 (NPP: (non proteged
piece)) unclear/


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[E25-l] - NID: Nimzo-Indian:
Samisch, Keres variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 Qa5 (NPP: (non proteged
piece)) 9.e4! /unclear


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[E25-m] - NID: Nimzo-Indian:
Samisch, Keres variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 Qa5 (NPP: (non proteged
piece)) 9.e4! Ne7 +/=


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[E25-n] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3)


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[E25-o] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.Qc2


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[E25-p] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.Qc2
f4 =/+


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[E25-q] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.c4


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[E25-r] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.c4
Qf6 (COAT: (counter attack))


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[E25-s] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.e4
fxe4 +/=


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[E25-t] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.e4
fxe4 10.Qa4+ +/=


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[E25-u] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.e4
fxe4 10.Qc2 (Qa5) +/=


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[E25-v] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.e4
fxe4 10.Qc2 0-0 +/=


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[E25-w] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.Nh3!?
(CD: c1-h6 (critical diagonal))


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[E25-x] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.Nh3!?
(CD: c1-h6 (critical diagonal))
Qa5 (NPP: (non proteged piece))


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[E25-y] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.Nh3!?
(CD: c1-h6 (critical diagonal))
Qa5 (NPP: (non proteged piece))
10.e4 +/-


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[E25-z] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.Nh3!?
(CD: c1-h6 (critical diagonal))
0-0 /unclear


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[E25-a*] - NID: Nimzo-Indian:
Samisch, Romanovsky variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.a3 Bxc3+ 5.bxc3 c5 (TL:
(Tarrasch's lever)) 6.f3 (WID:
e4 + counter Ne4)) d5 (TA:
(Tarrasch's anvil)) 7.cxd5 Nxd5
8.dxc5 f5! (WID: f4, Ne3) 9.Nh3!?
(CD: c1-h6 (critical diagonal))
0-0 10.c4 Qh4+ (COAT: (counter
attack)) /unclear


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