A40–D05WhiteQueen's Pawn Game1. d4 59 named linesZukertort VariationSymmetrical VariationModern DefenseColle System
A43–E60BlackIndian Defense1. d4 Nf6 52 named linesNormal VariationWest Indian DefenseAnti-Nimzo-IndianKnights Variation
A10–C20WhiteEnglish Opening1. c4 146 named linesSymmetrical VariationKing's English VariationSymmetrical VariationAnglo-Indian Defense
A40–A79BlackBenoni Defense1. d4 Nf6 2. c4 c5 53 named linesModern VariationKing's Pawn LineClassical VariationOld Benoni
A04–A41WhiteZukertort Opening1. Nf3 47 named linesSicilian InvitationDutch VariationLisitsyn GambitTennison Gambit
A80–A99BlackDutch Defense1. d4 f5 68 named linesNormal VariationFianchetto VariationClassical VariationClassical Variation
A02–B21WhiteBird Opening1. f4 29 named linesDutch VariationFrom's GambitWilliams GambitWagner-Zwitersch Gambit
A57–A59BlackBenko Gambit1. d4 Nf6 2. c4 c5 3. d5 b5 8 named linesZaitsev SystemFianchetto VariationNd2 VariationMutkin Countergambit
A45WhiteTrompowsky Attack1. d4 Nf6 2. Bg5 10 named linesEdge VariationClassical DefenseRaptor VariationPoisoned Pawn Variation
A05–A08WhiteKing's Indian Attack1. Nf3 d5 2. g3 17 named linesSicilian VariationSicilian VariationFrench VariationSymmetrical Defense
A57–A59BlackBenko Gambit Accepted1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 10 named linesFully Accepted VariationYugoslavKing Walk VariationFianchetto Variation
A00–C31WhiteVan Geet Opening1. Nc3 33 named linesReversed NimzowitschBerlin GambitDougherty GambitNowokunski Gambit
A00–A05WhitePolish Opening1. b4 24 named linesKing's Indian VariationTartakower GambitOutflank VariationGerman Defense
A00–A07WhiteHungarian Opening1. g3 20 named linesReversed AlekhineDutch DefenseParis GambitIndian Defense
A41–A55WhiteOld Indian Defense1. d4 d6 2. c4 14 named linesUkrainian VariationTwo Knights VariationNormal VariationJanowski Variation
A00WhiteGrob Opening1. g4 20 named linesGrob GambitKeene DefenseGrob Gambit DeclinedRomford Countergambit
A09–A14WhiteRéti Opening1. Nf3 d5 2. c4 17 named linesAdvance VariationRéti AcceptedZilbermints GambitPenguin Variation
A00WhiteKádas Opening1. h4 9 named linesKádas GambitKoola-Koola VariationSchneider GambitBeginner's Trap
A01–A06WhiteNimzo-Larsen Attack1. b3 18 named linesClassical VariationModern VariationModern VariationDutch Variation
A40BlackEnglund Gambit1. d4 e5 9 named linesMain LineStockholm VariationHartlaub-Charlick GambitMosquito Gambit
A40BlackMikenas Defense1. d4 Nc6 4 named linesCannstatter VariationLithuanian VariationPozarek Gambit
A40BlackEnglish Defense1. d4 b6 7 named linesEastbourne GambitPerrin VariationHartlaub Gambit DeclinedHartlaub Gambit Accepted
A57WhiteBenko Gambit Declined1. d4 Nf6 2. c4 c5 3. d5 b5 4. Nf3 6 named linesBishop AttackHjørring CountergambitPseudo-SämischQuiet Line
A40WhiteEnglund Gambit Declined1. d4 e5 2. d5 7 named linesReversed AlekhineReversed KrebsReversed FrenchReversed Brooklyn
A04–A40BlackColle System1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 Qa5+ 3 named linesRhamphorhynchus VariationSiroccopteryx Variation
A00WhiteFormation1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3 2 named linesShy Attack