OPENINGS THEORY
- ECO CODES BASE -

- D20 -

[D20-a] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4

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[D20-b] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.Qa4+

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[D20-c] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.Qa4+ Nc6!?

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[D20-d] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.Nc3

1. «De la Bourdonnais-A MDonnell, 1-0, London (8), 1834»

[D20-e] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.Nc3 e5 (QULV: d4-e5 (Queen's lever))

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[D20-f] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.Nc3 e5 (QULV: d4-e5 (Queen's lever)) 4.d5 c6 =

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[D20-g] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.Nc3 e5 (QULV: d4-e5 (Queen's lever)) 4.d5 c6 5.e4 Nf6 (CP=d5,e4 (critical points)) =

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[D20-h] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre))

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[D20-i] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever))

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[D20-j] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.dxe5?!

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[D20-k] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.dxe5?! Qxd1+ 5.Kxd1 Be6 =/+

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[D20-l] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nc3 (exd4) =

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[D20-m] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nc3 exd4 5.exd4 =

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[D20-n] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nc3 exd4 5.exd4 Bb4 6.Bxc4 +/=

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[D20-o] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nc3 exd4 5.exd4 Nf6 6.Bxc4 Bd6 /unclear

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[D20-p] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nc3 exd4 5.exd4 Nf6 6.Bxc4 Bd6 7.Nf3 (TNBF: (three Knights basic formation))

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[D20-q] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nc3 exd4 5.exd4 Nf6 6.Bxc4 Bd6 7.Nf3 (TNBF: (three Knights basic formation)) 0-0 8.0-0 +/=

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[D20-r] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nc3 exd4 5.exd4 Nf6 6.Bxc4 Be7 /unclear

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[D20-s] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nc3 exd4 5.exd4 Nf6 6.Bxc4 Be7 7.Nf3 (TNBF: (three Knights basic formation))

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[D20-t] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nc3 exd4 5.exd4 Nf6 6.Bxc4 Be7 7.Nf3 (TNBF: (three Knights basic formation)) 0-0 8.0-0 +/=

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[D20-u] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Bxc4 (exd4)

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[D20-v] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Bxc4 exd4 5.Qb3

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[D20-w] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Bxc4 exd4 5.exd4 +/=

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[D20-x] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Bxc4 exd4 5.exd4 (CIP: (central isolated pawn)) Nf6 +/=

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[D20-y] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Bxc4 exd4 5.exd4 (CIP: (central isolated pawn)) Nf6 +/= 6.Qb3 (CD=a2-g8 (critical diagonal)) +/=

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[D20-z] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Bxc4 exd4 5.exd4 (CIP: (central isolated pawn)) Nf6 +/= 6.Qb3 (CD=a2-g8 (critical diagonal)) Qe7 +/=

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[D20-a*] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) Nf6

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[D20-b*] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) Nf6 4.Bxc4 e6 (5.Nc3) /unclear

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[D20-c*] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) Nf6 4.Bxc4 e6 5.Nc3 a6 6.Nge2?!

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[D20-d*] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) Nf6 4.Bxc4 e6 5.Nc3 a6 6.Nf3 (TNBF: (three Knights basic formation)) /unclear

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[D20-e*] - QGA: Queen's gambit accepted 1.d4 d5 2.c4 dxc4 3.e3 (WRC: d4,e3 (White reserved centre)) Nf6 4.Bxc4 e6 5.Nc3 a6 6.Qf3

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[D20-f*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre))

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[D20-g*] - QGA: Queen's gambit accepted, 3.e4, Schwartz variation 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) f5!?

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[D20-h*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) b5

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[D20-i*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e6

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[D20-j*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nc6

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[D20-k*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nc6 4.d5

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[D20-l*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nc6 4.d5 Ne5 5.Bf4 Ng6 +/=

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[D20-m*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nc6 4.Nf3 +/=

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[D20-n*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nc6 4.Nf3 Bg4 (CP=d4 (critical point)) +/=

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[D20-o*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nc6 4.Nf3 Bg4 (CP=d4 (critical point)) 5.Be3 e6 +/=

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[D20-p*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nf6 (4.e5)

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[D20-q*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nf6 4.e5 Nd5 +/=

1. «»

[D20-r*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nf6 4.e5 Nd5 5.Bxc4 Nc6 +/=

1. «»

[D20-s*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nf6 4.e5 Nd5 5.Bxc4 Nb6 +/=

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[D20-t*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nf6 4.e5 Nd5 5.Bxc4 Nb6 6.Bd3 (SP: (strategic position)) +/=

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[D20-u*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nf6 4.e5 Nd5 5.Bxc4 Nb6 6.Bd3 (SP: (strategic position)) Nc6 +/=

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[D20-v*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nf6 4.e5 Nd5 5.Bxc4 Nb6 6.Bb3 (FL: (free line)) (Nc6) +/=

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[D20-w*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nf6 4.e5 Nd5 5.Bxc4 Nb6 6.Bb3 (FL: (free line)) Nc6 7.Nf3 +/=

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[D20-x*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) Nf6 4.e5 Nd5 5.Bxc4 Nb6 6.Bb3 (FL: (free line)) Nc6 7.Nf3 Bg4 (CP=d4 (critical point))

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[D20-y*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) c5 (TALV: d4-c5 (Tarrasch's lever)) /unclear

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[D20-z*] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) c5 (TALV: d4-c5 (Tarrasch's lever)) 4.Nf3 cxd4 Qxd4 =

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[D20-a**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) c5 (TALV: d4-c5 (Tarrasch's lever)) 4.d5 +/=

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[D20-b**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) c5 (TALV: d4-c5 (Tarrasch's lever)) 4.d5 Nf6 +/=

1. «»

[D20-c**] - QGA: Queen's gambit accepted, 3.e4, Linares variation 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) c5 (TALV: d4-c5 (Tarrasch's lever)) 4.d5 Nf6 5.Nc3 b5 +/=

1. «»

[D20-d**] - QGA: Queen's gambit accepted, 3.e4, Linares variation 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) c5 (TALV: d4-c5 (Tarrasch's lever)) 4.d5 Nf6 5.Nc3 b5 6.e5 b4 +/=

1. «»

[D20-e**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) c5 (TALV: d4-c5 (Tarrasch's lever)) 4.d5 e6 +/=

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[D20-f**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e5 (QULV: d4-e5 (Queen's lever))

1. «»

[D20-g**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nf3 exd4 5.Qxd4 =

1. «»

[D20-h**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nf3 exd4 5.Bxc4 +/=

1. «»

[D20-i**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nf3 exd4 5.Bxc4 Nc6 +/=

1. «»

[D20-j**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nf3 exd4 5.Bxc4 Bb4+ +/=

1. «»

[D20-k**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nf3 exd4 5.Bxc4 Bb4+ 6.Nbd2 +/=

1. «»

[D20-l**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nf3 exd4 5.Bxc4 Bb4+ 6.Nbd2 Nc6 +/=

1. «»

[D20-m**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nf3 Bb4+ (5.Nc3 exd4) +/=

1. «»

[D20-n**] - QGA: Queen's gambit accepted, 3.e4 1.d4 d5 2.c4 dxc4 3.e4 (WPC: d4,e4 (White perfect centre)) e5 (QULV: d4-e5 (Queen's lever)) 4.Nf3 Bb4+ 5.Nc3 exd4 6.Qxd4 +/=

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