С 10 Октября сайт начинает автоматически определять дебют, которым начинаются партии в классические шахматы.
Правда, эта попытка может оказаться неудачной по ряду причин.
Информация отображается при просмотре партий и в таблице вывода результата поиска партий.
Кроме названия дебютов указывается индекс дебюта согласно классификации Югославской энциклопедии.
Обращаю внимание, что определяются дебюты по классическим ходам. Если дебют получился с перестановкой ходов, то он не будет определен. И даже может быть определён не верно.
В определении дебютов возможны ошибки. Если Вы их обнаружите, то прошу сообщить мне.

Можно определять дебют не названием, а кодом (D40, C65)

E10 1.d4 Kf6 2.c4 e6 3.Kf3 c5 4.d5 b5
Гамбит Блюменфельда
E12-E19 1. d4 Kf6 2. c4 e6 3. Kf3 b6 Новоиндийская защита
и это очевидно

Прошло 0d 00:00:01 patriot - Прошло 0d 00:18:44 sergey
Классические шахматы
Время:
28d 14:05:27 - 29d 02:04:32
Начало партии:26.12.2011
Ход черных

1. e2-e4 e7-e5 2. Ng1-f3 Nb8-c6 3. c2-c3 Ng8-f6 4. d2-d4 e5xd4 5. e4-e5 Nf6-d5 6. c3xd4
А этот дебют вобще не определяется по теории это Английская партия
C44 Ponziani opening
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 поэтому мы должны играть как играют во всём мире с определением дебютов

C44 Ponziani opening
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3
C44 Ponziani: Caro variation
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 d7d5 4. d1a4 c8d7
C44 Ponziani: Leonhardt variation
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 d7d5 4. d1a4 g8f6
C44 Ponziani: Steinitz variation
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 d7d5 4. d1a4 f7f6
C44 Ponziani: Jaenisch counter-attack
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 g8f6
C44 Ponziani: Fraser defence
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 g8f6 4. d2d4 f6e4 5. d4d5 f8c5
C44 Ponziani: Reti variation
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 g8e7
C44 Ponziani: Romanishin variation
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 f8e7
C44 Ponziani counter-gambit
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 f7f5
C44 Ponziani counter-gambit, Schmidt attack
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 f7f5 4. d2d4 d7d6 5. d4d5
C44 Ponziani counter-gambit, Cordel variation
1. e2e4 e7e5 2. g1f3 b8c6 3. c2c3 f7f5 4. d2d4 d7d6 5. d4d5 f5e4
6. f3g5 c6b8 7. g5e4 g8f6 8. f1d3 f8e7

A00 Polish (Sokolsky) opening
1. b2b4
A00 Polish: Tuebingen variation
1. b2b4 g8h6
A00 Polish: Outflank variation
1. b2b4 c7c6
A00 Benko’s opening
1. g2g3
A00 Lasker simul special
1. g2g3 h7h5
A00 Benko’s opening: reversed Alekhine
1. g2g3 e7e5 2. g1f3
A00 Grob’s attack
1. g2g4
A00 Grob: spike attack
1. g2g4 d7d5 2. f1g2 c7c6 3. g4g5
A00 Grob: Fritz gambit
1. g2g4 d7d5 2. f1g2 c8g4 3. c2c4
A00 Grob: Romford counter-gambit
1. g2g4 d7d5 2. f1g2 c8g4 3. c2c4 d5d4
A00 Clemenz (Mead’s, Basman’s or de Klerk’s) opening
1. h2h3
A00 Global opening
1. h2h3 e7e5 2. a2a3
A00 Amar (Paris) opening
1. g1h3
A00 Amar gambit
1. g1h3 d7d5 2. g2g3 e7e5 3. f2f4 c8h3 4. f1h3 e5f4
A00 Dunst (Sleipner, Heinrichsen) opening
1. b1c3
A00 Dunst (Sleipner,Heinrichsen) opening
1. b1c3 e7e5
A00 Battambang opening
1. b1c3 e7e5 2. a2a3
A00 Novosibirsk opening
1. b1c3 c7c5 2. d2d4 c5d4 3. d1d4 b8c6 4. d4h4
A00 Anderssen’s opening
1. a2a3
A00 Ware (Meadow Hay) opening
1. a2a4
A00 Crab opening
1. a2a4 e7e5 2. h2h4
A00 Saragossa opening
1. c2c3
A00 Mieses opening
1. d2d3
A00 Mieses opening
1. d2d3 e7e5
A00 Valencia opening
1. d2d3 e7e5 2. b1d2
A00 Venezolana opening
1. d2d3 c7c5 2. b1c3 b8c6 3. g2g3
A00 Van’t Kruijs opening
1. e2e3
A00 Amsterdam attack
1. e2e3 e7e5 2. c2c4 d7d6 3. b1c3 b8c6 4. b2b3 g8f6
A00 Gedult’s opening
1. f2f3
A00 Hammerschlag (Fried fox/Pork chop opening)
1. f2f3 e7e5 2. e1f2
A00 Anti-Borg (Desprez) opening
1. h2h4
A00 Durkin’s attack
1. b1a3

A01 Nimzovich-Larsen attack
1. b2b3
A01 Nimzovich-Larsen attack: modern variation
1. b2b3 e7e5
A01 Nimzovich-Larsen attack: Indian variation
1. b2b3 g8f6
A01 Nimzovich-Larsen attack: classical variation
1. b2b3 d7d5
A01 Nimzovich-Larsen attack: English variation
1. b2b3 c7c5
A01 Nimzovich-Larsen attack: Dutch variation
1. b2b3 f7f5
A01 Nimzovich-Larsen attack: Polish variation
1. b2b3 b7b5
A01 Nimzovich-Larsen attack: symmetrical variation
1. b2b3 b7b6

A02 Bird’s opening
1. f2f4
A02 Bird: From gambit
1. f2f4 e7e5
A02 Bird: From gambit, Lasker variation
1. f2f4 e7e5 2. f4e5 d7d6 3. e5d6 f8d6 4. g1f3 g7g5
A02 Bird: From gambit, Lipke variation
1. f2f4 e7e5 2. f4e5 d7d6 3. e5d6 f8d6 4. g1f3 g8h6 5. d2d4
A02 Bird’s opening, Swiss gambit
1. f2f4 f7f5 2. e2e4 f5e4 3. b1c3 g8f6 4. g2g4
A02 Bird: Hobbs gambit
1. f2f4 g7g5
A03 Bird’s opening
1. f2f4 d7d5
A03 Mujannah opening
1. f2f4 d7d5 2. c2c4
A03 Bird’s opening: Williams gambit
1. f2f4 d7d5 2. e2e4
A03 Bird’s opening: Lasker variation
1. f2f4 d7d5 2. g1f3 g8f6 3. e2e3 c7c5

A03 Bird’s opening
1. f2f4 d7d5
A03 Mujannah opening
1. f2f4 d7d5 2. c2c4
A03 Bird’s opening: Williams gambit
1. f2f4 d7d5 2. e2e4
A03 Bird’s opening: Lasker variation
1. f2f4 d7d5 2. g1f3 g8f6 3. e2e3 c7c5

A04 Reti opening
1. g1f3
A04 Reti v Dutch
1. g1f3 f7f5
A04 Reti: Pirc-Lisitsin gambit
1. g1f3 f7f5 2. e2e4
A04 Reti: Lisitsin gambit deferred
1. g1f3 f7f5 2. d2d3 g8f6 3. e2e4
A04 Reti opening
1. g1f3 d7d6
A04 Reti: Wade defence
1. g1f3 d7d6 2. e2e4 c8g4
A04 Reti: Herrstroem gambit
1. g1f3 g7g5
A05 Reti opening
1. g1f3 g8f6
A05 Reti: King’s Indian attack, Spassky’s variation
1. g1f3 g8f6 2. g2g3 b7b5
A05 Reti: King’s Indian attack
1. g1f3 g8f6 2. g2g3 g7g6
A05 Reti: King’s Indian attack, Reti-Smyslov variation
1. g1f3 g8f6 2. g2g3 g7g6 3. b2b4
A06 Reti opening
1. g1f3 d7d5
A06 Reti: old Indian attack
1. g1f3 d7d5 2. d2d3
A06 Santasiere’s folly
1. g1f3 d7d5 2. b2b4
A06 Tennison (Lemberg, Zukertort) gambit
1. g1f3 d7d5 2. e2e4
A06 Reti: Nimzovich-Larsen attack
1. g1f3 d7d5 2. b2b3
A07 Reti: King’s Indian attack (Barcza system)
1. g1f3 d7d5 2. g2g3
A07 Reti: King’s Indian attack, Yugoslav variation
1. g1f3 d7d5 2. g2g3 g8f6 3. f1g2 c7c6 4. 0-0 c8g4
A07 Reti: King’s Indian attack, Keres variation
1. g1f3 d7d5 2. g2g3 c8g4 3. f1g2 b8d7
A07 Reti: King’s Indian attack
1. g1f3 d7d5 2. g2g3 g7g6
A07 Reti: King’s Indian attack, Pachman system
1. g1f3 d7d5 2. g2g3 g7g6 3. f1g2 f8g7 4. 0-0 e7e5 5. d2d3 g8e7
A07 Reti: King’s Indian attack (with ...c5)
1. g1f3 d7d5 2. g2g3 c7c5
A08 Reti: King’s Indian attack
1. g1f3 d7d5 2. g2g3 c7c5 3. f1g2
A08 Reti: King’s Indian attack, French variation
1. g1f3 d7d5 2. g2g3 c7c5 3. f1g2 b8c6 4. 0-0 e7e6 5. d2d3 g8f6
6. b1d2 f8e7 7. e2e4 0-0 8. f1e1
A09 Reti opening
1. g1f3 d7d5 2. c2c4
A09 Reti: advance variation
1. g1f3 d7d5 2. c2c4 d5d4
A09 Reti accepted
1. g1f3 d7d5 2. c2c4 d5c4
A09 Reti accepted: Keres variation
1. g1f3 d7d5 2. c2c4 d5c4 3. e2e3 c8e6

A10 English opening
1. c2c4
A10 English opening
1. c2c4 g7g6
A10 English: Adorjan defence
1. c2c4 g7g6 2. e2e4 e7e5
A10 English: Jaenisch gambit
1. c2c4 b7b5
A10 English: Anglo-Dutch defense
1. c2c4 f7f5

A11 English: Caro-Kann defensive system
1. c2c4 c7c6
A12 English: Caro-Kann defensive system
1. c2c4 c7c6 2. g1f3 d7d5 3. b2b3
A12 English: Torre defensive system
1. c2c4 c7c6 2. g1f3 d7d5 3. b2b3 g8f6 4. g2g3 c8g4
A12 English: London defensive system
1. c2c4 c7c6 2. g1f3 d7d5 3. b2b3 g8f6 4. g2g3 c8f5
A12 English: Caro-Kann defensive system
1. c2c4 c7c6 2. g1f3 d7d5 3. b2b3 g8f6 4. c1b2
A12 English: Bled variation
1. c2c4 c7c6 2. g1f3 d7d5 3. b2b3 g8f6 4. c1b2 g7g6
A12 English: New York (London) defensive system
1. c2c4 c7c6 2. g1f3 d7d5 3. b2b3 g8f6 4. c1b2 c8f5
A12 English: Capablanca’s variation
1. c2c4 c7c6 2. g1f3 d7d5 3. b2b3 g8f6 4. c1b2 c8g4
A12 English: Caro-Kann defensive system, Bogolyubov variation
1. c2c4 c7c6 2. g1f3 d7d5 3. b2b3 c8g4

A13 English opening
1. c2c4 e7e6
A13 English: Romanishin gambit
1. c2c4 e7e6 2. g1f3 g8f6 3. g2g3 a7a6 4. f1g2 b7b5
A13 English opening: Agincourt variation
1. c2c4 e7e6 2. g1f3 d7d5
A13 English: Wimpey system
1. c2c4 e7e6 2. g1f3 d7d5 3. b2b3 g8f6 4. c1b2 c7c5 5. e2e3
A13 English opening: Agincourt variation
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3
A13 English: Kurajica defence
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 c7c6
A13 English: Neo-Catalan
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6
A13 English: Neo-Catalan accepted
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6 4. f1g2 d5c4
A14 English: Neo-Catalan declined
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6 4. f1g2 f8e7 5. 0-0
A14 English: Symmetrical, Keres defence
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6 4. f1g2 f8e7 5. 0-0 c7c5
6. c4d5 f6d5 7. b1c3 b8c6
A15 English, 1...Nf6 (Anglo-Indian defense)
1. c2c4 g8f6
A15 English orang-utan
1. c2c4 g8f6 2. b2b4
A15 English opening
1. c2c4 g8f6 2. g1f3
A16 English opening
1. c2c4 g8f6 2. b1c3
A16 English: Anglo-Gruenfeld defense
1. c2c4 g8f6 2. b1c3 d7d5
A16 English: Anglo-Gruenfeld, Smyslov defense
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g2g3 g7g6 5. f1g2 d5c3
A16 English: Anglo-Gruenfeld, Czech defense
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g2g3 g7g6 5. f1g2 d5b6
A16 English: Anglo-Gruenfeld defense
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g1f3
A16 English: Anglo-Gruenfeld defense, Korchnoi variation
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g1f3 g7g6 5. g2g3 f8g7
6. f1g2 e7e5
A17 English opening
1. c2c4 g8f6 2. b1c3 e7e6
A17 English: Queens Indian formation
1. c2c4 g8f6 2. b1c3 e7e6 3. g1f3 b7b6
A17 English: Queens Indian, Romanishin variation
1. c2c4 g8f6 2. b1c3 e7e6 3. g1f3 b7b6 4. e2e4 c8b7 5. f1d3
A17 English: Nimzo-English opening
1. c2c4 g8f6 2. b1c3 e7e6 3. g1f3 f8b4
A18 English: Mikenas-Carls variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4
A18 English: Mikenas-Carls, Flohr variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4 d7d5 4. e4e5
A18 English: Mikenas-Carls, Kevitz variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4 b8c6
A19 English: Mikenas-Carls, Sicilian variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4 c7c5
A20 English opening
1. c2c4 e7e5
A20 English, Nimzovich variation
1. c2c4 e7e5 2. g1f3
A20 English, Nimzovich, Flohr variation
1. c2c4 e7e5 2. g1f3 e5e4
A21 English opening
1. c2c4 e7e5 2. b1c3
A21 English, Troeger defence
1. c2c4 e7e5 2. b1c3 d7d6 3. g2g3 c8e6 4. f1g2 b8c6
A21 English, Keres variation
1. c2c4 e7e5 2. b1c3 d7d6 3. g2g3 c7c6
A21 English opening
1. c2c4 e7e5 2. b1c3 d7d6 3. g1f3
A21 English, Smyslov defence
1. c2c4 e7e5 2. b1c3 d7d6 3. g1f3 c8g4
A21 English, Kramnik-Shirov counterattack
1. c2c4 e7e5 2. b1c3 f8b4
A22 English opening
1. c2c4 e7e5 2. b1c3 g8f6
A22 English: Bellon gambit
1. c2c4 e7e5 2. b1c3 g8f6 3. g1f3 e5e4 4. f3g5 b7b5
A22 English: Carls’ Bremen system
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3
A22 English: Bremen, reverse dragon
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 d7d5
A22 English: Bremen, Smyslov system
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 f8b4
A23 English: Bremen system, Keres variation
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 c7c6
A24 English: Bremen system with ...g6
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 g7g6
A25 English: Sicilian reversed
1. c2c4 e7e5 2. b1c3 b8c6
A25 English: closed system
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7
A25 English: closed, Taimanov variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e3 d7d6
6. g1e2 g8h6
A25 English: closed, Hort variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e3 d7d6
6. g1e2 c8e6
A25 English: closed, 5.Rb1
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. a1b1
A25 English: closed, 5.Rb1 Taimanov variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. a1b1 g8h6
A25 English: closed system (without ...d6)
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. d2d3
A26 English: closed system
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. d2d3 d7d6
A26 English: Botvinnik system
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. d2d3 d7d6
6. e2e4
A27 English: three knights system
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3
A28 English: four knights system
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6
A28 English: Nenarokov variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. d2d4 e5d4 5. f3d4 f8b4
6. c1g5 h7h6 7. g5h4 b4c3 8. b2c3 c6e5
A28 English: Bradley Beach variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. d2d4 e5e4
A28 English: four knights, Nimzovich variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e4
A28 English: four knights, Marini variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. a2a3
A28 English: four knights, Capablanca variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. d2d3
A28 English: four knights, 4.e3
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e3
A28 English: four knights, Stean variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e3 f8b4 5. d1c2 0-0
6. c3d5 f8e8 7. c2f5
A28 English: four knights, Romanishin variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e3 f8b4 5. d1c2 b4c3
A29 English: four knights, kingside fianchetto
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. g2g3
A30 English: symmetrical variation
1. c2c4 c7c5
A30 English: symmetrical, hedgehog system
1. c2c4 c7c5 2. g1f3 g8f6 3. g2g3 b7b6 4. f1g2 c8b7 5. 0-0 e7e6
6. b1c3 f8e7
A30 English: symmetrical, hedgehog, flexible formation
1. c2c4 c7c5 2. g1f3 g8f6 3. g2g3 b7b6 4. f1g2 c8b7 5. 0-0 e7e6
6. b1c3 f8e7 7. d2d4 c5d4 8. d1d4 d7d6 9. f1d1 a7a6 10. b2b3 b8d7
A31 English: symmetrical, Benoni formation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4
A32 English: symmetrical variation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4 c5d4 4. f3d4 e7e6
A33 English: symmetrical variation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4 c5d4 4. f3d4 e7e6 5. b1c3 b8c6
A33 English: symmetrical, Geller variation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4 c5d4 4. f3d4 e7e6 5. b1c3 b8c6
6. g2g3 d8b6
A34 English: symmetrical variation
1. c2c4 c7c5 2. b1c3
A34 English: symmetrical, three knights system
1. c2c4 c7c5 2. b1c3 g8f6 3. g1f3 d7d5 4. c4d5 f6d5
A34 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 g8f6 3. g2g3
A34 English: symmetrical, Rubinstein system
1. c2c4 c7c5 2. b1c3 g8f6 3. g2g3 d7d5 4. c4d5 f6d5 5. f1g2 d5c7
A35 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6
A35 English: symmetrical, four knights system
1. c2c4 c7c5 2. b1c3 b8c6 3. g1f3 g8f6
A36 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3
A36 English: ultra-symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7
A36 English: symmetrical, Botvinnik system reversed
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e3 e7e5
A36 English: symmetrical, Botvinnik system
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e4
A37 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3
A37 English: symmetrical, Botvinnik system reversed
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 e7e5
A38 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
A38 English: symmetrical, main line with d3
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
6. 0-0 0-0 7. d2d3
A38 English: symmetrical, main line with b3
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
6. 0-0 0-0 7. b2b3
A39 English: symmetrical, main line with d4
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
6. 0-0 0-0 7. d2d4

A13 English opening
1. c2c4 e7e6
A13 English: Romanishin gambit
1. c2c4 e7e6 2. g1f3 g8f6 3. g2g3 a7a6 4. f1g2 b7b5
A13 English opening: Agincourt variation
1. c2c4 e7e6 2. g1f3 d7d5
A13 English: Wimpey system
1. c2c4 e7e6 2. g1f3 d7d5 3. b2b3 g8f6 4. c1b2 c7c5 5. e2e3
A13 English opening: Agincourt variation
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3
A13 English: Kurajica defence
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 c7c6
A13 English: Neo-Catalan
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6
A13 English: Neo-Catalan accepted
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6 4. f1g2 d5c4
A14 English: Neo-Catalan declined
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6 4. f1g2 f8e7 5. 0-0
A14 English: Symmetrical, Keres defence
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6 4. f1g2 f8e7 5. 0-0 c7c5
6. c4d5 f6d5 7. b1c3 b8c6
A15 English, 1...Nf6 (Anglo-Indian defense)
1. c2c4 g8f6
A15 English orang-utan
1. c2c4 g8f6 2. b2b4
A15 English opening
1. c2c4 g8f6 2. g1f3
A16 English opening
1. c2c4 g8f6 2. b1c3
A16 English: Anglo-Gruenfeld defense
1. c2c4 g8f6 2. b1c3 d7d5
A16 English: Anglo-Gruenfeld, Smyslov defense
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g2g3 g7g6 5. f1g2 d5c3
A16 English: Anglo-Gruenfeld, Czech defense
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g2g3 g7g6 5. f1g2 d5b6
A16 English: Anglo-Gruenfeld defense
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g1f3
A16 English: Anglo-Gruenfeld defense, Korchnoi variation
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g1f3 g7g6 5. g2g3 f8g7
6. f1g2 e7e5
A17 English opening
1. c2c4 g8f6 2. b1c3 e7e6
A17 English: Queens Indian formation
1. c2c4 g8f6 2. b1c3 e7e6 3. g1f3 b7b6
A17 English: Queens Indian, Romanishin variation
1. c2c4 g8f6 2. b1c3 e7e6 3. g1f3 b7b6 4. e2e4 c8b7 5. f1d3
A17 English: Nimzo-English opening
1. c2c4 g8f6 2. b1c3 e7e6 3. g1f3 f8b4
A18 English: Mikenas-Carls variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4
A18 English: Mikenas-Carls, Flohr variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4 d7d5 4. e4e5
A18 English: Mikenas-Carls, Kevitz variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4 b8c6
A19 English: Mikenas-Carls, Sicilian variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4 c7c5
A20 English opening
1. c2c4 e7e5
A20 English, Nimzovich variation
1. c2c4 e7e5 2. g1f3
A20 English, Nimzovich, Flohr variation
1. c2c4 e7e5 2. g1f3 e5e4
A21 English opening
1. c2c4 e7e5 2. b1c3
A21 English, Troeger defence
1. c2c4 e7e5 2. b1c3 d7d6 3. g2g3 c8e6 4. f1g2 b8c6
A21 English, Keres variation
1. c2c4 e7e5 2. b1c3 d7d6 3. g2g3 c7c6
A21 English opening
1. c2c4 e7e5 2. b1c3 d7d6 3. g1f3
A21 English, Smyslov defence
1. c2c4 e7e5 2. b1c3 d7d6 3. g1f3 c8g4
A21 English, Kramnik-Shirov counterattack
1. c2c4 e7e5 2. b1c3 f8b4
A22 English opening
1. c2c4 e7e5 2. b1c3 g8f6
A22 English: Bellon gambit
1. c2c4 e7e5 2. b1c3 g8f6 3. g1f3 e5e4 4. f3g5 b7b5
A22 English: Carls’ Bremen system
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3
A22 English: Bremen, reverse dragon
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 d7d5
A22 English: Bremen, Smyslov system
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 f8b4
A23 English: Bremen system, Keres variation
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 c7c6
A24 English: Bremen system with ...g6
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 g7g6
A25 English: Sicilian reversed
1. c2c4 e7e5 2. b1c3 b8c6
A25 English: closed system
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7
A25 English: closed, Taimanov variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e3 d7d6
6. g1e2 g8h6
A25 English: closed, Hort variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e3 d7d6
6. g1e2 c8e6
A25 English: closed, 5.Rb1
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. a1b1
A25 English: closed, 5.Rb1 Taimanov variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. a1b1 g8h6
A25 English: closed system (without ...d6)
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. d2d3
A26 English: closed system
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. d2d3 d7d6
A26 English: Botvinnik system
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. d2d3 d7d6
6. e2e4
A27 English: three knights system
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3
A28 English: four knights system
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6
A28 English: Nenarokov variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. d2d4 e5d4 5. f3d4 f8b4
6. c1g5 h7h6 7. g5h4 b4c3 8. b2c3 c6e5
A28 English: Bradley Beach variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. d2d4 e5e4
A28 English: four knights, Nimzovich variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e4
A28 English: four knights, Marini variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. a2a3
A28 English: four knights, Capablanca variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. d2d3
A28 English: four knights, 4.e3
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e3
A28 English: four knights, Stean variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e3 f8b4 5. d1c2 0-0
6. c3d5 f8e8 7. c2f5
A28 English: four knights, Romanishin variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e3 f8b4 5. d1c2 b4c3
A29 English: four knights, kingside fianchetto
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. g2g3
A30 English: symmetrical variation
1. c2c4 c7c5
A30 English: symmetrical, hedgehog system
1. c2c4 c7c5 2. g1f3 g8f6 3. g2g3 b7b6 4. f1g2 c8b7 5. 0-0 e7e6
6. b1c3 f8e7
A30 English: symmetrical, hedgehog, flexible formation
1. c2c4 c7c5 2. g1f3 g8f6 3. g2g3 b7b6 4. f1g2 c8b7 5. 0-0 e7e6
6. b1c3 f8e7 7. d2d4 c5d4 8. d1d4 d7d6 9. f1d1 a7a6 10. b2b3 b8d7
A31 English: symmetrical, Benoni formation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4
A32 English: symmetrical variation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4 c5d4 4. f3d4 e7e6
A33 English: symmetrical variation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4 c5d4 4. f3d4 e7e6 5. b1c3 b8c6
A33 English: symmetrical, Geller variation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4 c5d4 4. f3d4 e7e6 5. b1c3 b8c6
6. g2g3 d8b6
A34 English: symmetrical variation
1. c2c4 c7c5 2. b1c3
A34 English: symmetrical, three knights system
1. c2c4 c7c5 2. b1c3 g8f6 3. g1f3 d7d5 4. c4d5 f6d5
A34 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 g8f6 3. g2g3
A34 English: symmetrical, Rubinstein system
1. c2c4 c7c5 2. b1c3 g8f6 3. g2g3 d7d5 4. c4d5 f6d5 5. f1g2 d5c7
A35 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6
A35 English: symmetrical, four knights system
1. c2c4 c7c5 2. b1c3 b8c6 3. g1f3 g8f6
A36 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3
A36 English: ultra-symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7
A36 English: symmetrical, Botvinnik system reversed
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e3 e7e5
A36 English: symmetrical, Botvinnik system
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e4
A37 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3
A37 English: symmetrical, Botvinnik system reversed
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 e7e5
A38 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
A38 English: symmetrical, main line with d3
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
6. 0-0 0-0 7. d2d3
A38 English: symmetrical, main line with b3
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
6. 0-0 0-0 7. b2b3
A39 English: symmetrical, main line with d4
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
6. 0-0 0-0 7. d2d4

A13 English opening
1. c2c4 e7e6
A13 English: Romanishin gambit
1. c2c4 e7e6 2. g1f3 g8f6 3. g2g3 a7a6 4. f1g2 b7b5
A13 English opening: Agincourt variation
1. c2c4 e7e6 2. g1f3 d7d5
A13 English: Wimpey system
1. c2c4 e7e6 2. g1f3 d7d5 3. b2b3 g8f6 4. c1b2 c7c5 5. e2e3
A13 English opening: Agincourt variation
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3
A13 English: Kurajica defence
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 c7c6
A13 English: Neo-Catalan
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6
A13 English: Neo-Catalan accepted
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6 4. f1g2 d5c4
A14 English: Neo-Catalan declined
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6 4. f1g2 f8e7 5. 0-0
A14 English: Symmetrical, Keres defence
1. c2c4 e7e6 2. g1f3 d7d5 3. g2g3 g8f6 4. f1g2 f8e7 5. 0-0 c7c5
6. c4d5 f6d5 7. b1c3 b8c6
A15 English, 1...Nf6 (Anglo-Indian defense)
1. c2c4 g8f6
A15 English orang-utan
1. c2c4 g8f6 2. b2b4
A15 English opening
1. c2c4 g8f6 2. g1f3
A16 English opening
1. c2c4 g8f6 2. b1c3
A16 English: Anglo-Gruenfeld defense
1. c2c4 g8f6 2. b1c3 d7d5
A16 English: Anglo-Gruenfeld, Smyslov defense
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g2g3 g7g6 5. f1g2 d5c3
A16 English: Anglo-Gruenfeld, Czech defense
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g2g3 g7g6 5. f1g2 d5b6
A16 English: Anglo-Gruenfeld defense
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g1f3
A16 English: Anglo-Gruenfeld defense, Korchnoi variation
1. c2c4 g8f6 2. b1c3 d7d5 3. c4d5 f6d5 4. g1f3 g7g6 5. g2g3 f8g7
6. f1g2 e7e5
A17 English opening
1. c2c4 g8f6 2. b1c3 e7e6
A17 English: Queens Indian formation
1. c2c4 g8f6 2. b1c3 e7e6 3. g1f3 b7b6
A17 English: Queens Indian, Romanishin variation
1. c2c4 g8f6 2. b1c3 e7e6 3. g1f3 b7b6 4. e2e4 c8b7 5. f1d3
A17 English: Nimzo-English opening
1. c2c4 g8f6 2. b1c3 e7e6 3. g1f3 f8b4
A18 English: Mikenas-Carls variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4
A18 English: Mikenas-Carls, Flohr variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4 d7d5 4. e4e5
A18 English: Mikenas-Carls, Kevitz variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4 b8c6
A19 English: Mikenas-Carls, Sicilian variation
1. c2c4 g8f6 2. b1c3 e7e6 3. e2e4 c7c5
A20 English opening
1. c2c4 e7e5
A20 English, Nimzovich variation
1. c2c4 e7e5 2. g1f3
A20 English, Nimzovich, Flohr variation
1. c2c4 e7e5 2. g1f3 e5e4
A21 English opening
1. c2c4 e7e5 2. b1c3
A21 English, Troeger defence
1. c2c4 e7e5 2. b1c3 d7d6 3. g2g3 c8e6 4. f1g2 b8c6
A21 English, Keres variation
1. c2c4 e7e5 2. b1c3 d7d6 3. g2g3 c7c6
A21 English opening
1. c2c4 e7e5 2. b1c3 d7d6 3. g1f3
A21 English, Smyslov defence
1. c2c4 e7e5 2. b1c3 d7d6 3. g1f3 c8g4
A21 English, Kramnik-Shirov counterattack
1. c2c4 e7e5 2. b1c3 f8b4
A22 English opening
1. c2c4 e7e5 2. b1c3 g8f6
A22 English: Bellon gambit
1. c2c4 e7e5 2. b1c3 g8f6 3. g1f3 e5e4 4. f3g5 b7b5
A22 English: Carls’ Bremen system
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3
A22 English: Bremen, reverse dragon
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 d7d5
A22 English: Bremen, Smyslov system
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 f8b4
A23 English: Bremen system, Keres variation
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 c7c6
A24 English: Bremen system with ...g6
1. c2c4 e7e5 2. b1c3 g8f6 3. g2g3 g7g6
A25 English: Sicilian reversed
1. c2c4 e7e5 2. b1c3 b8c6
A25 English: closed system
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7
A25 English: closed, Taimanov variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e3 d7d6
6. g1e2 g8h6
A25 English: closed, Hort variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e3 d7d6
6. g1e2 c8e6
A25 English: closed, 5.Rb1
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. a1b1
A25 English: closed, 5.Rb1 Taimanov variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. a1b1 g8h6
A25 English: closed system (without ...d6)
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. d2d3
A26 English: closed system
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. d2d3 d7d6
A26 English: Botvinnik system
1. c2c4 e7e5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. d2d3 d7d6
6. e2e4
A27 English: three knights system
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3
A28 English: four knights system
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6
A28 English: Nenarokov variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. d2d4 e5d4 5. f3d4 f8b4
6. c1g5 h7h6 7. g5h4 b4c3 8. b2c3 c6e5
A28 English: Bradley Beach variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. d2d4 e5e4
A28 English: four knights, Nimzovich variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e4
A28 English: four knights, Marini variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. a2a3
A28 English: four knights, Capablanca variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. d2d3
A28 English: four knights, 4.e3
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e3
A28 English: four knights, Stean variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e3 f8b4 5. d1c2 0-0
6. c3d5 f8e8 7. c2f5
A28 English: four knights, Romanishin variation
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. e2e3 f8b4 5. d1c2 b4c3
A29 English: four knights, kingside fianchetto
1. c2c4 e7e5 2. b1c3 b8c6 3. g1f3 g8f6 4. g2g3
A30 English: symmetrical variation
1. c2c4 c7c5
A30 English: symmetrical, hedgehog system
1. c2c4 c7c5 2. g1f3 g8f6 3. g2g3 b7b6 4. f1g2 c8b7 5. 0-0 e7e6
6. b1c3 f8e7
A30 English: symmetrical, hedgehog, flexible formation
1. c2c4 c7c5 2. g1f3 g8f6 3. g2g3 b7b6 4. f1g2 c8b7 5. 0-0 e7e6
6. b1c3 f8e7 7. d2d4 c5d4 8. d1d4 d7d6 9. f1d1 a7a6 10. b2b3 b8d7
A31 English: symmetrical, Benoni formation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4
A32 English: symmetrical variation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4 c5d4 4. f3d4 e7e6
A33 English: symmetrical variation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4 c5d4 4. f3d4 e7e6 5. b1c3 b8c6
A33 English: symmetrical, Geller variation
1. c2c4 c7c5 2. g1f3 g8f6 3. d2d4 c5d4 4. f3d4 e7e6 5. b1c3 b8c6
6. g2g3 d8b6
A34 English: symmetrical variation
1. c2c4 c7c5 2. b1c3
A34 English: symmetrical, three knights system
1. c2c4 c7c5 2. b1c3 g8f6 3. g1f3 d7d5 4. c4d5 f6d5
A34 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 g8f6 3. g2g3
A34 English: symmetrical, Rubinstein system
1. c2c4 c7c5 2. b1c3 g8f6 3. g2g3 d7d5 4. c4d5 f6d5 5. f1g2 d5c7
A35 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6
A35 English: symmetrical, four knights system
1. c2c4 c7c5 2. b1c3 b8c6 3. g1f3 g8f6
A36 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3
A36 English: ultra-symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7
A36 English: symmetrical, Botvinnik system reversed
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e3 e7e5
A36 English: symmetrical, Botvinnik system
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. e2e4
A37 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3
A37 English: symmetrical, Botvinnik system reversed
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 e7e5
A38 English: symmetrical variation
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
A38 English: symmetrical, main line with d3
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
6. 0-0 0-0 7. d2d3
A38 English: symmetrical, main line with b3
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
6. 0-0 0-0 7. b2b3
A39 English: symmetrical, main line with d4
1. c2c4 c7c5 2. b1c3 b8c6 3. g2g3 g7g6 4. f1g2 f8g7 5. g1f3 g8f6
6. 0-0 0-0 7. d2d4

A41 Queen’s Pawn
1. d2d4 d7d6
A41 Old Indian: Tartakower (Wade) variation
1. d2d4 d7d6 2. g1f3 c8g4
A41 Old Indian defence
1. d2d4 d7d6 2. c2c4
A41 Modern defence
1. d2d4 d7d6 2. c2c4 g7g6 3. b1c3 f8g7
A41 Robatsch defence: Rossolimo variation
1. e2e4 g7g6 2. d2d4 f8g7 3. g1f3 d7d6 4. c2c4 c8g4
A42 Modern defence: Averbakh system
1. d2d4 d7d6 2. c2c4 g7g6 3. b1c3 f8g7 4. e2e4
A42 Pterodactyl defence
1. d2d4 d7d6 2. c2c4 g7g6 3. b1c3 f8g7 4. e2e4 c7c5 5. g1f3 d8a5
A42 Modern defence: Averbakh system, Randspringer variation
1. d2d4 d7d6 2. c2c4 g7g6 3. b1c3 f8g7 4. e2e4 f7f5
A42 Modern defence: Averbakh system, Kotov variation
1. d2d4 d7d6 2. c2c4 g7g6 3. b1c3 f8g7 4. e2e4 b8c6