ECO A
ECO A - Flank Openings
Flank openings begin with moves other than 1.e4 or 1.d4. This includes the English Opening (1.c4), Reti Opening (1.Nf3), Bird's Opening (1.f4), and various irregular openings. These openings often transpose into other systems.
ECO Subcategories
A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30 A31 A32 A33 A34 A35 A36 A37 A38 A39 A40 A41 A42 A43 A44 A45 A46 A47 A48 A49 A50 A51 A52 A53 A54 A55 A56 A57 A58 A59 A60 A61 A62 A63 A64 A65 A66 A67 A68 A69 A70 A71 A72 A73 A74 A75 A76 A77 A78 A79 A80 A81 A82 A83 A84 A85 A86 A87 A88 A89 A90 A91 A92 A93 A94 A95 A96 A97 A98 A99
438 Openings Found
A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A00 A01 A01 A01 A01 A01 A01 A01 A01 A01 A10 A40 A30 A36 A36 A36 A38 A38 A34 A34 A34 A34 A30 A31 A33 A30 A30 A12 A10 A10 A10 A10 A20 A20 A20 A21 A21 A21 A21 A21 A21 A25 A25 A25 A25 A25 A25 A28 A28 A28 A28 A28 A28 A28 A28 A22 A22 A22 A23 A24 A22 A22 A20 A20 A20 A13 A13 A13 A13 A13 A13 A14 A14 A13 A13 A10 A10 A10 A10 A10 A10 A10 A10 A10 A10 A10 A10 A10 A10 A15 A15 A15 A16 A16 A17 A16 A16 A19 A18 A18 A17 A17 A16 A15 A15 A40 A40 A40 A40 A43 A43 A43 A44 A43 A43 A43 A43 A43 A56 A43 A43 A43 A43 A43 A43 A43 A43 A41 A84 A41 A42 A42 A41 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A40 A43 A40 A84 A80 A80 A84 A84 A84 A85 A85 A90 A90 A91 A92 A86 A87 A84 A84 A85 A82 A82 A83 A83 A83 A80 A82 A82 A81 A81 A81 A81 A81 A81 A80 A80 A80 A80 A80 A80 A80 A80 A80 A80 A80 A80 A80 A80 A80 A80 A40 A40 A40 A40 A40 A40 A40 A40 A41 A41 A42 A40 A40 A40 A40 A40 A40 A40 A40 A40 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A50 A50 A57 A57 A57 A57 A59 A57 A58 A57 A57 A57 A57 A57 A57 A57 A57 A57 A57 A56 A56 A56 A56 A56 A61 A60 A66 A68 A61 A62 A62 A61 A56 A56 A53 A53 A53 A53 A53 A53 A51 A51 A51 A52 A52 A52 A52 A52 A52 A52 A52 A50 A50 A50 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A45 A46 A47 A47 A47 A47 A46 A46 A46 A46 A46 A46 A46 A46 A46 A48 A48 A48 A48 A48 A46 A40 A40 A02 A03 A03 A03 A02 A02 A02 A02 A02 A02 A03 A06 A06 A06 A06 A09 A09 A09 A09 A09 A09 A06 A06 A07 A08 A06 A06 A04 A06 A04 A04 A04 A04
Anderssen's Opening
Polish Gambit, Anderssen's Opening
Creepy Crawly Formation
Andersspike
Ware; Meadow Hay; Crab
Wing Gambit, Ware Opening
Cologne Gambit, Ware Opening
Ware Gambit
Polish; Orangutan; Sokolsky; Hunt
Birmingham Gambit, Polish
Outflank Variation, Polish
Schuhler Gambit, Polish
Myers Variation, Polish
Bugayev Attack, Polish
Wolferts Gambit, Polish
Schiffler-Sokolsky; Tartakower Gambit
Brinckmann Variation, Polish
Bucker Defense, Polish
Grigorian Variation, Polish
Polish Spike
Karniewski; Tubingen Variation, Polish
Saragossa; Hempel's Opening
Hanham; Hayward
Mieses; Valencia; Venezuelan Opening
Venezolana
Reversed Rat
Spike Deferred; Myers Spike Attack
Keoni-Hiva Gambit
Van't Kruijs Opening
Bouncing Bishop Variation
Amsterdam Attack
Ekolu Variation
Alua Variation
Akahi Variation
Barnes; Gedult-Gunderam; Walkerling
King's Head Opening
Hammerschlag; Pork Chop Opening
Benko; Barczay; Bilek; Hungarian
Gambit 59
Regan Variation
Reversed Alekhine
Lasker Simul Special
Grob; Ahlhausen; Colibri; Fric; Genoa; Spike
Grob Gambit
Romford Counter-Gambit, Grob
Spike, Grob
Short Spike, Grob
Zilbermints Gambit, Grob
Keene Defense, Grob
Hurst Attack, Grob
Alessi Gambit, Grob
Double Grob
Spike Deferred
Bucker Defense, Grob
Clemenz Opening
Kadas Opening
Despres Opening
Koola-Koola
Wulumulu
St. George Defense, Dunst Nc3
Novosibirsk Variation, Dunst Nc3
Twyble Attack, Dunst Nc3
Dunst Gambit Nc3
Pseudo-Diemer Gambit, Dunst Nc3
Amazon, Dunst Nc3
Battambang, Dunst Nc3
Napoleon Attack, Dunst Nc3
Glasscoe Gambit, Dunst Nc3
Anti-Pirc Variation, Dunst Nc3
Tubingen Gambit, Dunst Nc3 Nf6
Krazy Kat Nh3
Symmetrical Variation, Larsen
English Variation, Larsen
Classical Variation, Larsen
Modern Variation, Larsen
Ringelbach Gambit, Larsen
Paschmann Gambit, Larsen
Dutch Variation, Larsen
Indian Variation, Larsen
Spike Variation, Larsen
Halibut Gambit, English
Hartlaub Gambit, English
Wing Variation, English
Symmetrical Variation, Symmetrical English
Botvinnik System Reversed, Symmetrical English
Botvinnik Variation, Symmetrical English
Double Fianchetto, Symmetrical English
Duchamp Variation, Symmetrical English
Fianchetto Variation, Symmetrical English
Rubinstein Variation, Symmetrical English
Asymmetrical Variation, English
Keres-Parma System, English
Napolitano Gambit, Symmetrical English
Two Knights Variation, English
Geller Variation, Symmetrical English
Hedgehog Variation, Symmetrical English
Double Fianchetto Defense, English
Bled Variation, English
Anglo Scandanavian Defense, English
Loehn Gambit, English
Schulz Gambit, English
Malvinas Variation, English
Kahiko-Hula Gambit, English
Double Whammy, English
Drill Variation, English
Kramnik-Shirov Variation, English
Troger Variation, English
Keres Defense, English
General Variation, King's English
Smyslov Variation, English
Anglo-Dutch
Taimanov Variation, English
Hungarian Attack, English
Closed System, Full Symmetry, King's English
Botvinnik System, King's English
Bremen-Hort Variation, English
Botvinnik Variation, English
Korchnoi Line, English
Flexible Line, English
Bradley Beach Variation, English
Four Knights Variation, English
Quiet Line, English
Romanishin Variation, English
Keene; Stean Variation, English
Botvinnik Line, English
Mazedonisch Variation, English
Bremen; Carls Variation, English
Kapengut; Smyslov; Modern V, English
Reversed Dragon, English
Prickly Pawn Pass System, English
Bellon Gambit, English
Erbenheimer Gambit, English
Nimzovich Variation, English
Nimzovich-Flohr Variation, English
English Queen
English Defense
King's Knight Variation, English
Wimpy System, English
Afincourt Variation, English
Kurajica Defense, English
Neo Catalan, English
Neo Catalan Declined, English
Keres Defense, English
Neo Catalan Accepted, English
Romanishin Gambit, English
Anglo-Dutch Defense
Anglo-Polish Dutch
Hickmann Gambit, English
Hickmann Gambit, English
Porcupine Variation, English
Wade Gambit, English
English Spike
Chabanon Gambit, English
Myers Defense, English
Zilbermints Gambit, English
Great Snake, English
Adorjan System, English
Beefeater
Anglo-Lithuanian Variation, English
Mikenas-Carls Variation, English
English Orangutan
Shirazi Shove
Golombek Defense, English; Anti English
Czech Variation, English
Smyslov Defense, English
Korchnoi's Variation, English
Stein Attack, English
Nei Gambit, English
Kevitz Defense, English
Queen's Indian Formation, English
Nimzo-English Opening
Zviagintsev-Krasenkov Attack, English
Anti-anti-grunfeld
King's Knight Variation, English
Romanishin Variation, English
St George's Gambit
Polish Defense
Spassky Gambit, Polish Defense
Queen Fianchetto, Queen Pawn Game
Zilbermints Gambit; Nakamura Gambit, Benoni
Old Benoni
Schmid Variation, Benoni
Blockade Variation; Semi-Benoni; Russian Variation
Franco-Benoni; Franco-Sicilian
Clarendon Court Variation, Benoni
Benoni-Staunton Gambit
Snail Variation, Benoni
Benoni-Indian Defense
Vulture Defense, Benoni
Woozle Defense, Benoni
Kingside move order, Benoni
Habichd; Hawk Variation, Benoni
Benoni Gambit Accepted
Cormorant Gambit, Benoni
Schlenker Defense, Benoni
Zilbermints-Benoni Gambit
Tamarkin Countergambit, Benoni
Anglo-Slav Opening
Slav Stonewall, Dutch
Pillsbury Defense; A41; Rat Defense
English Rat
Lisbon Gambit
Wade Defense
Charlick Gambit; Englund Gambit
Englund Gambit Declined
Diemer Counterattack
Thuring Gambit; Hartlaub-Charlick Gambit
Soller; Purchas Gambit
Englund; Behting Gambit
Felbecker Gambit
Soller Gambit Deferred
Zilbermints Gambit II, Englund Gambit
Zilbermints Gambit, Englund Gambit
Englund Gambit
Stockhom Variation, Englund Gambit
Mosquito Gambit, Englund
Horwitz Defense
Franco-Indian Defense
Seneschaud Variation, Dutch
English Defense
Perrin Variation
Poli Gambit
Hartlaub Gambit Declined
Hartlaub Gambit Accepted
Keres Defense, Indian; Kangaroo Defense
Transpositional Variation, Keres Defense
Franco-Sicilian Hybrid
Zilbermints Gambit
Bellon Gambit
Seneschaud Gambit, Dutch
Hopton Attack, Dutch
Classical Variation, Dutch
Bellon Gambit, Dutch
Rubinstein Variation, Dutch
Bladel Variation, Dutch
Normal Variation, Dutch
Classical Variation, Dutch
Nimzo-Dutch Variation
Botvinnik-Bronstein Variation, Dutch
Alekhine Variation, Dutch
Leningrad Variation, Dutch
Fluid Formation, Dutch
Queen's Knight Variation, Dutch
Krause Variation, Dutch
Ozol Variation, Dutch
Balogh Defense, Dutch
Staunton Gambit Accepted, Dutch
Nimzovich Variation, Dutch
Chigorin Variation, Dutch
Lasker Variation, Dutch
Blackmar's Second Gambit, Dutch
Tartakower Variation, Dutch
American Gambit, Dutch
Basman Variation, Dutch
Carlsbad Variation, Dutch
Antoshin-Hort Variation, Dutch
Ilyin-Genevsky Variation, Dutch
Blackburne Variation, Dutch
Semi-Leningrad Variation, Dutch
Lisbon Gambit, Dutch; Krejcik Gambit
Hevendehl Gambit, Dutch
Tate Gambit, Dutch
Korchnoi's Variation, Dutch
Janzen-Korchnoi Gambit, Dutch
Raphael Variation, Dutch
Kingfisher Gambit, Dutch
Spielmann Gambit, Dutch
Barcza Variation, Dutch
Alapin; Ulvestad; Manhattan; Kmoch Variation, Dutch
Anti-Stonewall, Dutch
Anti-Modern, Dutch
Anti-Classical Line, Dutch
Anti-Leningrad Variation, Dutch
Manhattan Gambit, Dutch
Pretzel Gambit, Dutch
Borg Gambit
Queen Pawn Fianchetto
Kotov-Robatsch Defense
Pseudo-Saemisch
Rossolimo Variation
Neo-Modern Defense
Beefeater Variation
Modern Defense
Averbakh Variation, Modern
Pterodactyl Variation, Modern
Randspringer Variation
Kotov Variation, Modern
Lizard Defense; Pirc-Diemer Gambit
Bogoljubov; Mikenas-Van Geet Defense
Lundin Defense
Lithuanian Variation, Mikenas
Cannstatter Variation, Mikenas
Pozarek Gambit
Montevideo Defense
Zaire Defense
Basque Opening
Trompowsky; Opocensky; Ruth Opening
Poisoned Pawn Variation, Trompowsky
Chepukaitis Gambit
Borg Variation, Trompowsky
Edge Variation, Trompowsky
Hergert Gambit #2, Trompowsky
Hergert Gambit #1, Trompowsky
Raptor Variation, Trompowsky
Hergert Gambit, Trompowsky
Pyrenees Gambit
Queen's Indian Defense; Saemisch-Indian
Sosonko Variation, Benko Gambit
Bishop Attack, Benko Gambit
Benko Gambit Accepted
Pawn Return Variation, Benko Gambit
King Walk Variation, Benko Gambit
Central Storming Variation, Benko Gambit
Fianchetto Variation, Benko Gambit
Modern Variation, Benko Gambit
Dlugy Variation, Benko Gambit
Zaitsev System, Benko Gambit
Nescafe Frappe Attack, Benko Gambit
Zaitsev Variation, Benko Gambit
Benko Gambit Declined; Hjoerring Countergambit
Pseudo-Saemisch, Benko Gambit
Mutkin Countergambit, Benko Gambit
Quiet Line, Benko Gambit
Main Line, Benko Gambit Declined
Hromadka System, Benoni
Lundin; Bronstein Counter-Gambit
Petrosian System; Czech Benoni Defense
Czech Variation, Benoni
King's Indian System, Benoni
Snake Variation, Benoni
Modern Benoni
Mikenas V, Benoni
Four Pawns Attack, Benoni
Uhlmann Variation, Benoni
Fianchetto Variation, Benoni
Hastings Defense, Benoni
Nimzovich Variation, Knight's Tour Variation, Benoni
Vulture Variation; Der Geier
Weenink Variation, Benoni
Aged Gibbon Gambit
Janowski Variation, Old Indian
Grinberg Gambit, Old Indian
Ukranian Variation
Duz-Khotimirsky Variation
Tartakower-Indian
Fajarowicz Variation, Budapest
Bonsdorf Variation, Budapest
Steiner Variation, Budapest
Rubinstein Variation, Budapest
Kornl Richter Gambit, Budapest
Center Play Variation, Budapest; Alekhine Variation
Balogh; Tartakower C-G, Budapest
Barmina Gambit, Budapest
Wikstrom Gambit, Budapest
Abonyi Variation, Budapest
Adler Variation, Budapest
Medusa Gambit
Van Geet; Kevitz; Trajkovic; Mexican
Horsefly Gambit
Pawn Push Variation
Omega Gambit
Arafat Gambit
Paleface Attack
Webster Gambit
Blackmar-Diemer Gambit Deferred
Kraus-Muhlherr Counter Gambit
Gedult Attack
Gedult-Gunderam System
Linder Counter Gambit
Canard Attack
Ueberlinger Gambit
Bullfrog; Weidenhagen; Krabbe; Ochsenfrosch
Bronstein Gambit
Oshima Defense
Gibbins-Wiedehagen Gambit Accepted
Stummer Gambit
Maltese Falcon
Reversed Chigorin Defense
Von Beivorseen
Malich Gambit
Huebsch Gambit
Maddigan Gambit
Lazard Gambit; Maddigan Gambit
Polish Defense
Torre Attack
Schnepper Gambit
Marienbad Variation
Berg Variation
Spielmann-Indian
Pseudo-Benko Gambit
Czech-Indian
London System
Torre Attack
Petrosian Gambit
Swiss; Wagner Gambit
Nimzovich Variation, Torre Attack
Yusupov-Rubinstein System
London System, Torre Attack
London Variation
Fianchetto Defense, Torre Attack
Euwe Variation, Torre Attack
King's Indian Variation
Dory Defense
Polish Variation
Dunworth Variation, Modern Defense
Bird's Opening; Dutch Attack
Sturm; Mujannah
Prokofiev Gambit, Bird
Williams Gambit, Bird
From's Gambit, Bird
Canard Formation; Double Duck
Pawn Thrust Attack, Bird
Swiss Gambit, Bird
Hobbs Gambit, Bird
Batavo Polish Attack, Bird
Horsefly Defense, Bird
Nf3
Nimzovich Opening, Reti Nf3
Bloodgood Gambit, Reti Nf3
Santasiere's Folly, Reti Nf3
Nf3
Benoni Reversed; Wing Blumenfeld Nf3
Reti Polonaise Nf3
Penguin Variation, Reti Nf3
Reti Gambit Accepted Nf3
Neo-Catalan, Reti Nf3
Old Indian Attack Nf3
Tennison G; Lemberg G; Abonyi G Nf3
Nf3
Nf3
Reversed Mexican Defense, Reti Nf3
Ampel Variation, Reti Nf3
Wade Defense Nf3
Improved Lisitsin G, Reti Nf3
Lisitsin Gambit; Polish Gambit Nf3
Polish G; Dalesio G; Pirc-Lisitsin G Nf3
Herrstrom Gambit, Reti Nf3
Oberndorfer Gambit; Reti Nf3