OPENINGS THEORY
- ECO CODES BASE -

- A00 -

UNORTHODOX OPENINGS
(Other than: 1.e4, 1.d4, 1.Nf3, 1.c4, 1.f4, 1.b3)

[A00-a] - Durkin's attack 1.Na3 =/+ (QPOP:) (see also: B00)

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[A00-b] - Ware opening 1.a4 =/unclear (QPOP:) (see also: B00, D43)

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[A00-c] - Gedult's opening 1.f3?! =/+ (RMOP: (Relatively Mixed Opening)) (see also: B01, B06, B34, C20, D00)

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[A00-d] - Kadas opening 1.h4 = (TPOP: (Totally Pure Opening))

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[A00-e] - Delmar opening 1.Nh3?! =/+ (QPOP:) (see also: B25, B26, E32)

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[A00-f] - Mead opening 1.h3?! =/+ (SMOP: (Strongly Mixed Opening)) (see also: A06, A47, A48, A80, B06, C20, C27, C41, C42, C47, C48, C50, D00, D02, D13, E61, E90)

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[A00-g] - Saragossa opening 1.c3!? =/unclear (CHOP: (Chameleon Opening)) (see also: AOO, A03, A04, A05, A06, A07, A08, A17, A40, A41, A43, A45, A46, A47, A48, A49 A80, A81, B00, B06, B07, B10, B20, B21, B22, C00, C02, C13, C41, C44, D00, D02, D03, D04, D05, D10, D13, D30, D31, D35, D36, D38, D55, D73, D79, D90)

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[A00-h] - Saragossa opening Alekhine retort: 1...Nf6! 1.c3!? Nf6! =/+ (CHOP: (Chameleon Opening)) (see also: AOO, A03, A04, A05, A06, A07, A08, A17, A40, A41, A43, A45, A46, A47, A48, A49 A80, A81, B00, B06, B07, B10, B20, B21, B22, C00, C02, C13, C41, C44, D00, D02, D03, D04, D05, D10, D13, D30, D31, D35, D36, D38, D55, D73, D79, D90)

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[A00-i] - Grob's attack 1.g4!? =/unclear (TPOP: (Totally Pure Opening))

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[A00-j] - Grob's attack Ackermann retort: 1...e5 1.g4!? e5 (2.Bg2) = (TPOP: (Totally Pure Opening))

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[A00-k] - Grob's attack Becker retort: 1...d5 1.g4!? d5 (2.Bg2) =/+ (TPOP: (Totally Pure Opening))

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[A00-l] - Anderssen's opening 1.a3 (g6) =/+ (SMOP: (Strongly Mixed Opening)) (see also: A05, A07, A09, A11, A12, A16, A17, A2O, A21, A22, A25, A26, A28, A29, A30, A33, A34, A36, A37, A38, A46, B09, B13, B20, B30, B48, B84, C20, C26, C44, C47, C55, D00, D02, D12, D13, D14, D30, D34, D37, D40, D45, D46, D51, D63, D79, D94, E00, E12, E57)

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[A00-m] - Anderssen's opening Boncourt retort: 1...e5 1.a3 e5 =/unclear (SMOP: (Strongly Mixed Opening))

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[A00-n] - Anderssen's opening Ware retort: 1...d5 1.a3 d5 =/unclear (RMOP: (Relatively Mixed Opening)) (see also: A07, A09, A12, A20, D00, D02, D12, D13, D30, D34, D37, D40, D45, D46, D51, D79, D94, E57)

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[A00-o] - Mieses opening 1.d3 (Nf6) =/unclear (SMOP: (Strongly Mixed Opening)) (see also: A02, A03, A04, A05, A06, A07, A08, A09, A10, A11, A12, A14, A15, A16, A20, A21, A22, A24, A25, A26, A27, A28, A29, A34, A36, A37, A38, A49, B01, B02, B06, B07, B10, B20, B21, B22, B23, B25, B26, B30, B40, B50, C00, C20, C25, C40, C41, C42, C44, C46, C47, D13)

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[A00-p] - Mieses opening Ramirez retort: 1...c5 1.d3 c5!? =/unclear (CHOP: (Chameleon Opening))

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[A00-q] - Mieses opening Benko retort: 1...g6! 1.d3 g6 =/+ (CHOP: (Chameleon Opening))

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[A00-r] - Mieses opening Muller-Loman retort: 1...e5 1.d3 e5 =/+ (SMOP: (Strongly Mixed Opening)) (see also: A02, A04, A05, A07, A20, A21, A22, A25, A26, A27, A28, A29, B02, B10, B26, C20, C25, C26, C30, C40, C41, C44, C46, C47)

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[A00-s] - Mieses opening Muller-Loman retort: 1...e5 Ragosin-Kan system: 2.c4 (Nf6) 1.d3 e5 2.c4 (Nf6) +/= (RMOP: (Relatively Mixed Opening)) (see also: A16, A20 to A29)

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[A00-t] - Mieses opening Muller-Loman retort: 1...e5 Mortimer system: 2.e4 (Nf6) 1.d3 e5 2.e4 (Nf6) =/+ (RMOP: (Relatively Mixed Opening)) (see also: A05, A22, B02, B10, C20, C25, C26, C29 C40, C41, C42, C44, C46, C47, C56) (BSIA: (Black Significant Advantage))

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[A00-u] - Mieses opening Owen retort: 1...d5 1.d3 d5 = (SMOP: (Strongly Mixed Opening)) (see also: A03, A04, A05, A06, A07, A08, A09, A10, A12, A14, A15, A29, A49, B01, B02, B06, B07, B10, B24, C00, C44)

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[A00-v] - Mieses opening Owen retort: 1...d5 Tergalsen-Najdorf system: 2.e4 1.d3 d5 2.e4?! =/+ (SMOP: (Strongly Mixed Opening)) (see also: A07, B01, B02, B07, B10, B11, B20, B40, C00, C20, C42, C44, C47) (BSIA: (Black Significant Advantage))

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[A00-w] - Mieses opening Owen retort: 1...d5 Blackburne-Von Bardeleben system: 2.g3 1.d3 d5 2.g3 = (RMOP: (Relatively Mixed Opening)) (see also: A03, A04, AO5, A07, A08, A09, A11, A12, A49, B10, B20, B23, B24, C00)

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[A00-x] - Mieses opening Owen retort: 1...d5 Mason-Tarrasch system: 2.Nf3 1.d3 d5 2.Nf3 =/unclear (CHOP: (Chameleon Opening))

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[A00-y] - Williams opening 1.e3?! =/+ (CHOP: (Chameleon Opening)) (see also: A01, A02, A03, A04, A05, A06, A10, A11, A12, A13, A16, A17, A20, A21, A22, A25, A27, A28, A30, A31, A34, A35, A36, A40, A41, A43, A45, A46, A47, A48, A53, A54, A56, A80, A85, A86, A91, B13, B14, C01, C49, C50, D00, D02, D04, D05, D07, D10, D11, D12, D20, D27, D30, D31, D35, D37, D40, D45, D47, D70, D71, D94, D95, E12, E14, E60, E61, E67)

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[A00-z] - Polish (Sokolsky) opening 1.b4 =/+ (QPOP: (Quasi Pure Opening)) (see also: A15, A48, D45, D94, E12, E60, E61)

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[A00-a*] - Polish (Sokolsky) opening Simagin variation: 1...a5 1.b4 a5!? (2.b5) =/+ (QPOP:) (see also: A15)

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[A00-b*] - Polish (Sokolsky) opening Volbrecht variation: 1...e6 1.b4 e6!? (2.Bb2) =/+ (TPOP: (Totally Pure Opening))

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[A00-c*] - Polish (Sokolsky) opening Outflank variation: 1...c6 1.b4 c6 (2.Bb2) =/+ (QPOP:) (see also: A15, D94, E60)

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[A00-d*] - Polish (Sokolsky) opening Morgan variation: 1...Nf6 1.b4 Nf6 (2.c4) =/+ (RMOP: (Relatively Mixed Opening)) (see also: A15, A48, D94, E60, E61)

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[A00-e*] - Polish (Sokolsky) opening Morgan variation: 1...Nf6 Richter retort: 2.Nf3 1.b4 Nf6 2.Nf3 =/+ (RMOP: (Relatively Mixed Opening)) (see also: A05, A15, A24, A48, D94, E60)

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[A00-f*] - Polish (Sokolsky) opening Morgan variation: 1...Nf6 Sokolsky retort: 2.Bb2 1.b4 Nf6 2.Bb2 =/unclear (RMOP: (Relatively Mixed Opening)) (see also: A05, A15, A48, D94, E60, E61)

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[A00-g*] - Polish (Sokolsky) opening Wiesel-Blum system: 1...d5 1.b4 d5 (2.e3) =/+ (QPOP:) (see also: A15, D45, D94)

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[A00-h*] - Polish (Sokolsky) opening Wiesel-Blum system: 2...d5 Tartakower retort: 2.Nf3 1.b4 d5 2.Nf3 =/+ (QPOP:) (see also: A15, A48, D45)

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[A00-i*] - Polish (Sokolsky) opening Wiesel-Blum system: 1...d5 2.Bb2 1.b4 d5 2.Bb2 =/+ (QPOP:) (see also: A15, A48, D94)

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[A00-j*] - Polish (Sokolsky) opening Wiesel-Blum system: 2.Bb2 Nf6 1.b4 d5 2.Bb2 Nf6 =/unclear (QPOP:) (see also: A15, A48, D94)

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[A00-k*] - Polish (Sokolsky) opening Wiesel-Blum system: 3.e3 1.b4 d5 2.Bb2 Nf6 3.e3 =/unclear (QPOP:) (see also: A15, A48, D94)

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[A00-l*] - Polish (Sokolsky) opening Skipworth-Cuthbertson system: 1...e5 1.b4 e5 (2.b5) = (QPOP:) (see also: A15, E60, E61)

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[A00-m*] - Polish (Sokolsky) opening Skipworth-Cuthbertson system: 1...e5 Basman retort: 2.a3 1.b4 e5 2.a3 = (TPOP: (Totally Pure Opening))

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[A00-n*] - Polish (Sokolsky) opening Skipworth-Cuthbertson system: 2.Bb2 1.b4 e5 2.Bb2 = (QPOP:) (see also: A15, E60, E61)

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[A00-o*] - Polish (Sokolsky) opening Skipworth-Cuthbertson system: 2.Bb2 Lomaya exchange: 2... Bxb4 3.Bxe5 1.b4 e5 2.Bb2 Bxb4! 3.Bxe5 (Nf6) =/+ (TPOP: (Totally Pure Opening))

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[A00-p*] - Polish (Sokolsky) opening Skipworth-Cuthbertson system: 2.Bb2 d6 1.b4 e5 2.Bb2 d6 (3.c4) = (QPOP:) (see also: A15, E60, E61)

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[A00-q*] - Polish (Sokolsky) opening Skipworth-Cuthbertson system: 3.e3 1.b4 e5 2.Bb2 d6 3.e3 = (QPOP:) (see also: A15, E60, E61)

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[A00-r*] - Dunst (Sleipner) opening 1.Nc3 = (CHOP: (Chameleon Opening)) (see also: A03, A04, A05, A07, A08, A37, A40, A41, A43, A45, A46, A47, A48, A80, B00, B01, B02, B06, B07, B08, B09, B11, B12, B15, B16, B17, B18, B19, B20, B21, B23, B24, B25, B26, B27, B28, B29, B30, B31, B33, B34, B35, B40, B43, B45, B46, B47, B48, B50, B51, B52, B53, B56, B59, B61, B62, B63, B66, B67, B70, B71, B72, B73, B74, B76, B77, B78, B80, B81, B82, B83, B84, B86, B87, B88, B89, B90, B92, B94, B95, B97, B99, C00, C01, C10 to C19, C25, C26, C27, C28, C29, C30, C34, C41, C42, C45, C46, C47, C48, C49, C50, C55, C65, C66, D00, D01, D03)

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[A00-s*] - Dunst (Sleipner) opening Schubert retort: 1...e6 1.Nc3 e6?! +/= (SMOP: (Strongly Mixed Opening))

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[A00-t*] - Dunst (Sleipner) opening Pedersen retort: 1...g6 1.Nc3 g6 = (SMOP: (Strongly Mixed Opening))

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[A00-u*] - Dunst (Sleipner) opening Madame de Remusat retort: 1...e5 1.Nc3 e5?! +/= (RMOP: (Relatively Mixed Opening)) (see also: A07, B00, B07, B24, B30, B50, C10, C25, C26, C27, C28, C29, C30, C41, C42, C45, C46, C47, C48, C49, C50, C55, C64) (WSIA: (White Significant Advantage))

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[A00-v*] - Dunst (Sleipner) opening Madame de Remusat retort: 1...e5 Napoleon's choice: 2.Nf3 1.Nc3 e5?! 2.Nf3 (Nc6) +/= (RMOP: (Relatively Mixed Opening)) (see also: A07, B00, B07, B24, B30, B50, C10, C25, C26, C27, C28, C29, C30, C41, C42, C45, C46, C47, C48, C49, C50, C55, C64) (WSIA: (White Significant Advantage))

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[A00-w*] - Dunst (Sleipner) opening Madame de Remusat retort: 1...e5 Ban-Kluger system: 2.Nf3 Nc6 3.d4 1.Nc3 e5?! 2.Nf3 Nc6 3.d4 (exd4 4.Nxd4) =/+ (QPOP: (Quasi Pure Opening)) (see also: C45, C46, C47, C50) (WSIA: (White Significant Advantage))

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[A00-x*] - Dunst (Sleipner) opening Wallace retort: 1...Nf6 1.Nc3 Nf6 +/= (CHOP: (Chameleon Opening))

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[A00-y*] - Dunst (Sleipner) opening Grierson retort: 1...c5 1.Nc3 c5! =/+ (CHOP: (Chameleon Opening))

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[A00-z*] - Dunst (Sleipner) opening Grierson retort: 1...c5 Wallis-Colle system: 2.Nf3 1.Nc3 c5! 2.Nf3 =/+ (SMOP: (Strongly Mixed Opening)) (see also: A04, A05, A08, A37, A43, A46, B15, B20, B23, B24, B25, B26, B27, B29, B30, B31, B32, B33, B34, B35, B40, B41, B43, B45, B46, B47, B48, B49, B50, B51, B52, B53, B54, B56, B59, B61, B62, B63, B66, B67, B69, B70, B72, B73, B74, B75, B76, B77, B78, B79, B80, B81, B82, B83, B84, B86, B87, B88, B89, B90, B91, B92, B94, B95, B96, B97, B98, B99, C00, C10, D00, D01)

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[A00-a**] - Dunst (Sleipner) opening Noa retort: 1...d5 1.Nc3 d5 = (SMOP: (Strongly Mixed Opening)) (see also: A03, A07, A80, B01, B02, B06, B11, B15, B16, B17, B18, B19, B21, B23, B24, B40, C00, C01, C07, C10 to C19, D00, D01)

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[A00-b**] - Dunst (Sleipner) opening Noa retort: 1...d5 Lasker-Ewers system: 2.e4 1.Nc3 d5 2.e4 = (RMOP: (Relatively Mixed Opening)) (see also: A08, B01, B02, B11, B13, B15, B16, B17, B18, B19, B21, B23, C00, C01, C10 to C19)

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[A00-c**] - Dunst (Sleipner) opening Noa retort: 1...d5 Lasker-Ewers system: 2.e4 d4 1.Nc3 d5 2.e4 d4 = (QPOP: (Quasi Pure Opening)) (see also: B21)

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[A00-d**] - Dunst (Sleipner) opening Noa retort: 1...d5 Lasker-Ewers system: 3.Nce2 e5 1.Nc3 d5 2.e4 d4 3.Nce2 e5 +/= (TPOP: (Totally Pure Opening))

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[A00-e**] - Dunst (Sleipner) opening Noa retort: 1...d5 Lasker-Ewers system: 4.Ng3 1.Nc3 d5 2.e4 d4 3.Nce2 e5 4.Ng3 +/= (TPOP: (Totally Pure Opening))

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[A00-f**] - Benko's opening 1.g3 +/= (CHOP: (Chameleon Opening))

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[A00-g**] - Benko's opening Cardoso retort: 1...e6 1.g3 e6 +/= (CHOP: (Chameleon Opening))

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[A00-h**] - Benko's opening Walter retort: 1...f5 1.g3 f5 +/= (SMOP: (Strongly Mixed Opening)) (see also: A01, A04, A10, A20, A21, A25, A26, A41, A81, A84, A86, A87, A88, A89, A90 to A99)

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[A00-i**] - Benko's opening Kobert retort: 1...c5 1.g3 c5 +/= (CHOP: (Chameleon Opening))

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[A00-j**] - Benko's opening Kobert retort: 1...e5 1.g3 e5 +/= (SMOP: (Strongly Mixed Opening)) (see also: A01, A04, A05, A07, A08, A09, A10, A11, A20, A21, A22, A23, A24, A25, A26, A27, A29, A36, A37, A41, A42, A53, A54, A55, B02, B07, B10, C00, C20, C25, C26, C44, E61, E67, E69)

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[A00-k**] - Benko's opening Yates retort: 1...Nf6 1.g3 Nf6 +/= (CHOP: (Chameleon Opening))

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[A00-l**] - Benko's opening Steiner retort: 1...g6 1.g3 g6 +/= (CHOP: (Chameleon Opening))

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[A00-m**] - Benko's opening Steiner retort: 1...g6 Benko-Steiner system: 2.Bg2 Bg6 1.g3 g6 2.Bg2 Bg6 +/= (CHOP: (Chameleon Opening))

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[A00-n**] - Benko's opening Green retort: 1...d5 1.g3 d5 +/= (CHOP: (Chameleon Opening))

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[A00-o**] - Benko's opening Green retort: 1...d5 Averback-Bagirov system: 2.Bg2 c6 1.g3 d5 2.Bg2 c6 = (RMOP: (Relatively Mixed Opening)) (see also: A03, A07, A11, A12, A90, B10, B23, D00, D02, D11, D13, D78, D79, E01, E09)

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[A00-p**] - Benko's opening Green retort: 1...d5 Averback-Bagirov system: 2.Bg2 c6 3.d3 1.g3 d5 2.Bg2 c6 3.d3 = (RMOP: (Relatively Mixed Opening)) (see also: A03, A07, A11, A12, A53, B10, B23)

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