OPENINGS THEORY

- ECBX: ECO CODES BASE -
(ECB Classification)

- C42 i - a to q**

[C42-a] - PD: Petrov's defence 1.e4 e5 2.Nf3 Nf6 (3.d4 (see: C43))

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[C42-b] - PD: Petrov's defence 1.e4 e5 2.Nf3 Nf6 3.c3 (WID: (With the idea) d4)+(Nc6 (see: C44))+(d6 (see: C41))

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[C42-c] - PD: Petrov's defence 1.e4 e5 2.Nf3 Nf6 3.Bd3

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[C42-d] - PD: Petrov's defence Lehtinen Retort (3.Qe2) 1.e4 e5 2.Nf3 Nf6 3.Qe2

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[C42-e] - PD: Petrov's defence Keres Retort (3.Bb5) 1.e4 e5 2.Nf3 Nf6 3.Bb5 +(Nc6 (see: C48, C49, C62, C66 C67, C77, C80, C84, C87))

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[C42-f] - PD: Petrov's defence Kavalek Retort (3.d3) 1.e4 e5 2.Nf3 Nf6 3.d3

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[C42-g] - PD: Petrov's defence Kavalek Retort (3.d3) 1.e4 e5 2.Nf3 Nf6 3.d3 d6 +(see also: A05, C44)

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[C42-h] - PD: Petrov's defence Kavalek Retort (3.d3) 1.e4 e5 2.Nf3 Nf6 3.d3 Nc6 (TNBF: (three Knights basic form.)) +(see also: A05, A07, A28, C26, C44, C47)

1. «Vik-Hansen, Rune (1854) - Tollefsen, Vegard (1699) C42 (48) 1-0 NMN 2002 kl. M (2) Saga Hotel Tromso, 2002»

[C42-i] - PD: Petrov's defence Kavalek Retort (3.d3) 1.e4 e5 2.Nf3 Nf6 3.d3 Nc6 4.Nc3 (FNBF: (four Knights basic form.))+(see also: C26, C44, C47))

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[C42-j] - PD: Petrov's defence Staunton Retort (3.Bc4) or Italian Game 1.e4 e5 2.Nf3 Nf6 3.Bc4 +(see also: C24, C41, C50, C53 to C59))+(Nc6 (see: C24, C28 C50, C51, C53 to C59, C90))

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[C42-k] - PD: Petrov's defence Staunton Retort (3.Bc4) or Italian Game 1.e4 e5 2.Nf3 Nf6 3.Bc4 d5?! +(see also: C24))

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[C42-l] - PD: Petrov's defence Staunton Retort (3.Bc4) or Italian Game 1.e4 e5 2.Nf3 Nf6 3.Bc4 Bc5?! +(see also: C24, C27, C50, C53, C54, C56))

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[C42-m] - PD: Petrov's defence Staunton Retort (3.Bc4) or Italian Game 1.e4 e5 2.Nf3 Nf6 3.Bc4 d6 +(see also: C24, C41, C50, C55, C56, C66, C84))

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[C42-n] - PD: Petrov's defence Staunton Retort (3.Bc4) or Italian Game 1.e4 e5 2.Nf3 Nf6 3.Bc4 d6 4.Nc3 (TNBF: (three Knights basic form.))+(see also: C41, C50, C55))

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[C42-o] - PD: Petrov's defence Staunton-Cochrane var. (3.Bc4 Nxe4) 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4

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[C42-p] - PD: Petrov's defence Staunton-Cochrane var. (3.Bc4 Nxe4) 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nxe5 (Qe7) =

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[C42-q] - PD: Petrov's defence Staunton-Cochrane var. (3.Bc4 Nxe4) 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nxe5 d5 =

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[C42-r] - PD: Petrov's defence Staunton-Cochrane var. (3.Bc4 Nxe4) 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3 (Nd6)+(Nc6 (see: C55)) =

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[C42-s] - PD: Petrov's defence Staunton-Cochrane var. (3.Bc4 Nxe4) 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3 Nf6 (TNBF: (three Knights basic formation)) (5.Nxe5) =

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[C42-t] - PD: Petrov's defence Staunton-Cochrane var. (3.Bc4 Nxe4) 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3 Nxc3 5.dxc3 (c6) =/unclear

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[C42-u] - PD: Petrov's defence Staunton-Cochrane var. (3.Bc4 Nxe4) 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3 Nxc3 5.dxc3 f6 =/unclear

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[C42-v] - PD: Petrov's defence Three Knights var. (3.Nc3) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) (Nc6 (FNBF) see: (C47))+(see also: C28, C41, C45, C47 to C50, C55, C62, C66, C77)

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[C42-w] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 (4.d4 (see: C41))+(see also: B07, B71, C41, C45 to C48, C50, C55, C62, C66, C77)

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[C42-x] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.g3 (Be7)+(Nc6 (see: C47)) =/unclear

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[C42-y] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.Be2 (see also: C41, C47) =/unclear

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[C42-z] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.Be2 Be7 (see also: C41, C47) =/unclear

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[C42-a*] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.Be2 Be7 5.0-0 (see also: C41) =/unclear

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[C42-b*] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.d3 (Nc6 (see: C47)) =

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[C42-c*] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.d3 Be7 =

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[C42-d*] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.h3 (Nc6) (see also: C41, C45, C47, C48, C50, C55, C65) =

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[C42-e*] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.h3 Be7 (see also: C41, C50, C55) =

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[C42-f*] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.Bc4 (Nc6) (see also: C41, C50, C55) =

1. «Abulker, Claude (1356) - Silva (1258) C42 (38) 1-0, Jeu.echecs.com, blitz, 2005»

[C42-g*] - PD: Petrov's defence Three Knights var. (3.Nc3) Blackburne Retort (3...d6) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) d6 4.Bc4 Be7 (see also: C41, C50, C55) =

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[C42-h*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4

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[C42-i*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 /unclear

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[C42-j*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 d6 /unclear

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[C42-k*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 d5 /unclear

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[C42-l*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 (5.d4) /unclear

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[C42-m*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 5.Bg5 (see also: C47) /unclear

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[C42-n*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 5.Bg5 0-0 /unclear

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[C42-o*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 5.Bg5 d6 /unclear

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[C42-p*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 (FNBP: (four Knights basic position)) 5.Be2 /unclear

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[C42-q*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 (FNBP: (four Knights basic position)) 5.Be2 d5 /unclear

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[C42-r*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 (FNBP: (four Knights basic position)) 5.Bd2 /unclear

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[C42-s*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 (FNBP: (four Knights basic position)) 5.Bd2 d5 /unclear

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[C42-t*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 (FNBP: (four Knights basic position)) 5.Bd2 0-0 /unclear

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[C42-u*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 (FNBP: (four Knights basic position)) 5.Bd2 d6 /unclear

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[C42-v*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.d3 Nc6 (FNBP: (four Knights basic position)) 5.Bd2 d6 6.Bg5 /unclear

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[C42-w*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 =/unclear

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[C42-x*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 Bxc3 =/unclear

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[C42-y*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 Qe7 =/unclear

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[C42-z*] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 Qe7 5.Nf3 =/unclear

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[C42-a**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 Qe7 5.Nd3 =/unclear

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[C42-b**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 0-0 =/unclear

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[C42-c**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 0-0 5.Nd3 =/unclear

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[C42-d**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 0-0 5.Be2 =/unclear

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[C42-e**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 0-0 5.Be2 Re8 =/unclear

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[C42-f**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Nxe5 0-0 5.Be2 Re8 6.Nd3 =/unclear

1. «Perlo, Gerardus van (2448) - Sprenger, Dr. Ernst Hendrik (2441) C42 1/2-1/2 Dick Smit Memorial NBC Email, 2000»

[C42-g**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 =/unclear

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[C42-h**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 Bxc3 =/unclear

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[C42-i**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 d6 =/unclear

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[C42-j**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 0-0 =/unclear

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[C42-k**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 Nc6 (5.Bb5 (see: C49)) =/unclear

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[C42-l**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 Nc6 5.Nd5 =/unclear

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[C42-m**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 Nc6 5.Ng5 =/unclear

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[C42-n**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 Nc6 5.a3 =/unclear

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[C42-o**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 Nc6 5.0-0 (0-0 6.Bb5 (see: C49)) =/unclear

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[C42-p**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 Nc6 5.0-0 0-0 6.d3 =/unclear +(see also: C28, C55)

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[C42-q**] - PD: Petrov's defence Three Knights var. (3.Nc3) Lowenthal Retort (3...Bb4) 1.e4 e5 2.Nf3 Nf6 3.Nc3 (TNBF) Bb4 4.Bc4 Nc6 5.d3 =/unclear +(see also: C28, C50, C55)

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