Chess-Theory , links, openings, eco codes, analysed games, base

OPENINGS THEORY
- ECO CODES BASE -

- E04 -

[E04-a] - Catalan:
open, 5.Nf3
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL=
c4-d5 (Queen's gambit lever))
4.Bg2 dxc4 5.Nf3

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[E04-b] - Catalan:
open, 5.Nf3 Nc6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL=
c4-d5 (Queen's gambit lever))
4.Bg2 dxc4 5.Nf3 Nc6 (CP=d4)

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[E04-c] - Catalan:
open, 5.Nf3 Nc6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Nc6 (CP=d4)
6.0-0 Rb8

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[E04-d] - Catalan:
open, 5.Nf3 Nc6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Nc6 (CP=d4)
6.Qa4 Bb4+

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[E04-e] - Catalan:
open, 5.Nf3 Nc6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Nc6 (CP=d4)
6.Qa4 Bb4+ 7.Bd2 Be7 +/=

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[E04-f] - Catalan:
open, 5.Nf3 Nc6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Nc6 (CP=d4)
6.Qa4 Bb4+ 7.Bd2 Nd5 (PFC:
(pawns-figures complex)) +/=

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[E04-g] - Catalan:
open, 5.Nf3 Bb4+
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Bb4+ +/=

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[E04-h] - Catalan:
open, 5.Nf3 Bb4+
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Bb4+ 6.Bd2 +/=

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[E04-i] - Catalan:
open, 5.Nf3 Bb4+
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Bb4+ 6.Bd2
Be7 +/=

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[E04-j] - Catalan:
open, 5.Nf3 Bb4+
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Bb4+ 6.Bd2
Be7 7.Qc2 Bd7 (LBF: (lower
Bishops formation)) +/=

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[E04-k] - Catalan:
open, 5.Nf3 b5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 b5

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[E04-l] - Catalan:
open, 5.Nf3 b5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 b5 6.a4 (AL:
(Alekhine's lever)) c6

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[E04-m] - Catalan:
open, 5.Nf3 Nbd7
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Nbd7 (WID: Nb6)

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[E04-n] - Catalan:
open, 5.Nf3 Nbd7
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Nbd7 (WID: Nb6)
6.0-0 c5 (TALV: (Tarrasch's lever))

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[E04-o] - Catalan:
open, 5.Nf3 Nbd7
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Nbd7 (WID: Nb6)
6.0-0 Rb8 (WID: b5) =

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[E04-p] - Catalan:
open, 5.Nf3 Nbd7
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 Nbd7 (WID: Nb6)
6.Nbd2 Nb6 +/=

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[E04-q] - Catalan:
open, 5.Nf3 a6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 a6 (WID: b5)

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[E04-r] - Catalan:
open, 5.Nf3 a6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 a6 (WID: b5)
6.a4 (WID: counter b5) c5 (TL)

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[E04-s] - Catalan:
open, 5.Nf3 a6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 a6 (WID: b5)
6.0-0 b5

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[E04-t] - Catalan:
open, 5.Nf3 a6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 a6 (WID: b5)
6.Ne5! c5 (TL=c5-d4)

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[E04-u] - Catalan:
open, 5.Nf3 a6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 a6 (WID: b5)
6.Be3 (CP=d4)

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[E04-v] - Catalan:
open, 5.Nf3 a6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 a6 (WID: b5)
6.Be3 (CP=d4) Nd5

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[E04-w] - Catalan:
open, 5.Nf3 a6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 a6 (WID: b5)
6.Be3 (CP=d4) Nd5 7.dxc5

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[E04-x] - Catalan:
open, 5.Nf3 a6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 a6 (WID: b5)
6.Be3 (CP=d4) Nd5 7.dxc5 Qc7

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[E04-y] - Catalan:
open, 5.Nf3 a6
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 a6 (WID: b5)
6.Be3 (CP=d4) Nd5 7.dxc5 Qc7
9.Bd4 +/=

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[E04-z] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)

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[E04-a*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0

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[E04-b*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4)

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[E04-c*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Ne5!? +/=

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[E04-d*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Ne5!? +/=
Nxe5 8.dxe5 Qxd1

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[E04-e*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Ne5!? Bd7
(8.Nxd7!?) +/=

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[E04-f*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Ne5!? Bd7
8.Nxc6 +/=

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[E04-g*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 +/=

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[E04-h*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 cxd4
8.Nxd4

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[E04-i*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 cxd4
8.Nxd4 Qxd4 9.Bxc6+

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[E04-j*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 Bd7

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[E04-k*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 Bd7
8.dxc5 Bxc5 +/=

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[E04-l*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 Bd7
8.dxc5 Na5!? /unclear

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[E04-m*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 Bd7
8.Qxc4 b5!? (IPR: (indirect
protection)) /unclear

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[E04-n*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 Bd7
8.Qxc4 b5!? (IPR: (indirect
protection)) 9.Qd3 c4 (BMQS:
(Black's majority on the
Queen's side)) /unclear

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[E04-o*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 Bd7
8.Qxc4 cxd4 (9.Nxd4)

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[E04-p*] - Catalan:
open, 5.Nf3 c5
1.d4 Nf6 2.c4 e6 3.g3 d5 (QGL)
4.Bg2 dxc4 5.Nf3 c5 (TL=c5-d4)
6.0-0 Nc6 (CP=d4) 7.Qa4 Bd7
8.Qxc4 cxd4 9.Nxd4 Rc8 (DWTH:
(Development With Threat)) +/=

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