A20u — English: King’s, 2.g3 Nf6 3.Bg2 d5

1.c4 e5 2.g3 Nf6 3.Bg2 d5 * ○ Trait aux Blancs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Plans. cxd5 (Capture en d5, Occuper le centre — 99 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

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Plans. ...Nbd7 (Développer Nb8) ; ...Bf5 (Développer Bc8) ; ...Be7 (Développer Bf8) ; ...c6 (Renforcer le centre) ; ...c5 (Frapper le centre adverse).

Avantages

Faiblesses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→g3, h2→g3	—
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	● e4 (2v1), ● g4 (2v0)
Cases faibles	—	● d5
Centre	—	● d4 (1v0), ● e4 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bg2	● Bg2 Actif (mob. 5)
Bc8		● Bc8 Non développé (mob. 5)
Bf8		● Bf8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	5 (● b1, ● g1, ● c1, ● a1, ● h1)	5 (● b8, ● c8, ● f8, ● a8, ● h8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Au centre	● Au centre
Droits de roque	O-O / O-O-O	O-O / O-O-O

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	mobile
Ruptures	● d2-d4, ● e2-e4, ● f2-f4	—

Partie
10. Tal Mem 2016 – Round 6.5 – Aronian, Levon – 1-0 – Giri, Anish – G25 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. d3 Be7 8. Be3 O-O 9. Nbd2 Be6 10. Rc1 Qd7
11. Norway Blitz 2023 – Round 6.4 – Firouzja, Alireza – 1-0 – Mamedyarov, Shakhriyar – G28 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Be7 8. Bb2 f6 9. Qc2 O-O 10. Rd1 Nb4
1943 Zlin – Round 3 – Zita, Frantisek – 1-0 – Vasicek, Martin – G23 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Bd6 6. O-O Nc6 7. Nc3 Nde7 8. d4 exd4 9. Nxd4 Nxd4 10. Qxd4 O-O
1965 BRA Ch 32th – Round 9 – Gadia, Olicio – 0-1 – Rocha, Antonio – G28 1. c4 Nf6 2. g3 d5 3. Bg2 e5 4. d3 Nc6 5. Nf3 Be7 6. cxd5 Nxd5 7. O-O O-O 8. a3 Be6 9. b4 a6 10. Bb2 f6
2025 FIDE World Cup - Round R1 Classical 1 - Cahaya, Satria Duta - 1/2-1/2 - Haik M. Martirosyan - G664 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Bd6 8. Bb2 O-O 9. d3 Re8 10. Nbd2 a5
3. Norway Chess 2015 – Round 1 – Nakamura, Hikaru – 1-0 – Hammer, Jon Ludvig – G1 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Be7 8. Bb2 f6 9. d4 e4 10. Ne1 f5
34. ECC Open 2018 – Round 1.5 – Howell, David W L – 1/2-1/2 – Burg, Twan – G25 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Be7 7. d4 e4 8. Ne5 f5 9. Nxc6 bxc6 10. Qc2 Qd6
Amber-blindfold 13th 2004 – Round 5 – Topalov, Veselin – 1/2-1/2 – Vallejo Pons, Francisco – G10 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. d3 Be7 8. a3 O-O 9. Nbd2 a5 10. b3 Be6
Croatia GCT 2019 – Round 6.1 – Ding, Liren – 1-0 – Nepomniachtchi, Ian – G31 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Be7 7. d4 e4 8. Ne5 f5 9. Nxc6 bxc6 10. Qc2 Nb4
FIDE World Cup 2017 – Round 2.3 – Li, Chao – 1/2-1/2 – Sevian, Samuel – G254 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 g6 8. Nc3 Be7 9. d3 O-O 10. Bh6 Re8
FIDE World Cup 2019 – Round 2.3 – Ding, Liren – 1-0 – Movsesian, Sergei – G258 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Bd6 8. Bb2 O-O 9. d3 Qe7 10. Nbd2 Ba3
FIDE World Cup 2025 – Round R1 Classical 1 – Aleksandar Indjic – 1-0 – Schnaider Ilan – G28 1. c4 e6 2. g3 d5 3. Bg2 Nf6 4. Nf3 Be7 5. O-O O-O 6. d4 dxc4 7. Qc2 a6 8. a4 Bd7 9. Qxc4 Bc6 10. Bg5 Nbd7
GCT Blitz Paris 2017 – Round 14.3 – Topalov, Veselin – 1/2-1/2 – Vachier-Lagrave, Maxime – G68 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Bd6 8. Nc3 O-O 9. Bb2 Re8 10. d3 Bf8
GCT Blitz Paris 2017 – Round 4.4 – Topalov, Veselin – 1/2-1/2 – Karjakin, Sergey – G19 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Be7 7. d4 e4 8. Ne5 f5 9. Nxc6 bxc6 10. Qc2 Qd7
GCT Rapid Paris 2016 – Round 2.5 – Aronian, Levon – 1-0 – Fressinet, Laurent – G10 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Be7 7. d4 e4 8. Ne5 f5 9. Nxc6 bxc6 10. Qc2 Qd7
Hoogovens 1999 – Round 1 – Topalov, Veselin – 1-0 – Timman, Jan H – G1 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Be7 7. d4 e4 8. Ne5 f5 9. Nxc6 bxc6 10. Qa4 Qd7
Lindores Abbey Tal Memorial 2021 – Round 1.12 – Abdusattorov, Nodirbek – 1-0 – Kosteniuk, Alexandra – G4 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Be7 8. Bb2 f6 9. Nc3 O-O 10. Rc1 Bg4
Saint Louis Blitz 2023 – Round 15.5 – Robson, Ray – 1/2-1/2 – So, Wesley – G75 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nf6 7. d3 h6 8. Nbd2 Bd6 9. b3 O-O 10. Bb2 Re8
Sharjah Grand Prix 2017 – Round 6.1 – Adams, Michael – 1/2-1/2 – Vachier-Lagrave, Maxime – G46 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Bd6 8. Bb2 O-O 9. Nc3 Re8 10. Ne4 Bf8
SuperGM 2000 – Round 6 – Bareev, Evgeny – 1-0 – Huebner, Robert – G18 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. d3 Be7 8. a3 Be6 9. Nbd2 f6 10. b4 O-O
Tal Memorial 2007 – Round 7 – Carlsen, Magnus – 1/2-1/2 – Gelfand, Boris – G28 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Be7 7. d4 e4 8. Ne5 f5 9. Nxc6 bxc6 10. Nc3 O-O
World Blitz 2007 – Round 30 – Carlsen, Magnus – 1/2-1/2 – Gelfand, Boris – G288 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Be7 7. d3 O-O 8. a3 a5 9. b3 Be6 10. Bb2 f6
World Blitz 2016 – Round 17.3 – Nakamura, Hikaru – 0-1 – Vachier-Lagrave, Maxime – G682 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Bd6 8. Bb2 O-O 9. d3 Re8 10. Nbd2 Bg4
World Blitz 2018 – Round 11.4 – Le, Quang Liem – 1/2-1/2 – Giri, Anish – G659 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Be7 8. Bb2 f6 9. d3 O-O 10. Nbd2 Be6
World Blitz 2022 – Round 16.9 – Dardha, Daniel – 1/2-1/2 – Harikrishna, Pentala – G884 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Be7 7. d4 e4 8. Ne5 f5 9. Nxc6 bxc6 10. Qc2 Bd7
World Blitz 2022 – Round 20.38 – Shankland, Sam – 1-0 – Hansen, Eric – G1070 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 g6 8. Nc3 Bg7 9. Ba3 a5 10. Rc1 Nb4
World Blitz 2022 – Round 3.29 – Yakubboev, Nodirbek – 0-1 – Martirosyan, Haik M. – G145 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Be7 8. Bb2 f6 9. Qc2 Nb4 10. Qc1 c5
World Blitz Final 2012 – Round 8 – Kotsur, Pavel – 0-1 – Karjakin, Sergey – G55 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. d4 e4 7. Ne5 f5 8. Nxc6 bxc6 9. Qc2 Qd7 10. a3 Be7
World Rapid 2016 – Round 6.2 – Aronian, Levon – 1-0 – Korobov, Anton – G218 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Be7 8. Bb2 f6 9. Qc1 O-O 10. Rd1 Qe8
World Rapid 2019 – Round 15.53 – Nikolov, Nikolay Petrov – 1/2-1/2 – Hansen, Eric – G987 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Bd6 8. Bb2 O-O 9. d3 Bf5 10. Nbd2 Qd7
World Rapid 2021 – Round 1.2 – Donchenko, Alexander – 0-1 – Nakamura, Hikaru – G12 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. b3 Be6 8. Bb2 f6 9. Nc3 Qd7 10. Qc1 Nd5

A20u — King’s (1943)

1.c4 e5 2.g3 Nf6 3.Bg2 d5

Les coups candidats

4.cxd5 — 98.7% (12414 parties)

Ambassadeurs : B, Owen (53x), Kerr, Stephen G.R. (52x), Mercadal Benejam, Josep (47x), Vecek, Marjan (40x), Quinones Borda Jorge Victor (37x), Suba, Mihai (28x), Tiviakov, Sergei (27x), Romanishin, Oleg M (27x)

4.d3 — 0.4% (47 parties)

Ambassadeurs : Bezold, Michael (2x), Gadia, Olicio (1x), Rocha, Antonio (1x), Wall, Alejandro (1x), Holsapple, Boyd (1x), Siebrecht, Raphaelle (1x), Flear, Christine (1x), Luecke, Norbert (1x)

4.Nc3 — 0.3% (37 parties)

Ambassadeurs : Rutter, Blair A (2x), Sosnov, Gennady (1x), Klimovich, Anatoly (1x), Fekete, Bela (1x), Gombar, Janos (1x), Moore, John C (1x), Eckardt M (1x), Pulec, Rozic Lea (1x)

4.b3 — 0.2% (19 parties)

Ambassadeurs : Erban, Stepan (1x), Krska, Vojtech (1x), Martin Ferenc (1x), Aguado, P (1x), Korp, Kathrin (1x), Sarkany, Petra (1x), Eberth, Manfred (1x), Beyer, Dietmar (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4.cxd5	4.d3	4.Nc3	4.b3
<1800	750	95%	1%	1%	1%
1800-2200	5328	99%	0%	0%	0%
2200-2600	5320	100%	0%	0%	—
2600+	277	100%	—	—	—

Évolution par décennie (% des parties)

Décennie	N parties	4.cxd5	4.d3	4.Nc3	4.b3
1950s	20	100%	—	—	—
1960s	35	97%	3%	—	—
1970s	38	100%	—	—	—
1980s	219	98%	0%	—	—
1990s	941	99%	0%	1%	0%
2000s	2447	98%	1%	0%	0%
2010s	6775	99%	0%	0%	0%
2020s	2101	99%	0%	0%	0%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4.cxd5	99%	99%	-0.1%
4.d3	0%	0%	+0.0%
4.Nc3	0%	0%	-0.0%
4.b3	0%	0%	+0.1%

Joueurs célèbres

Champions du monde dans cette position

Ding, Liren — 10 parties
Carlsen, Magnus — 6 parties
Kramnik, Vladimir — 4 parties
Anand, Viswanathan — 4 parties
Kasparov, Garry — 2 parties
Hou, Yifan — 2 parties
Botvinnik, Mikhail — 1 partie
Karpov, Anatoly — 1 partie
Gukesh D — 1 partie

Parties historiques

4.cxd5 — 98.7% (12414 parties)

1951 — Smyslov, Vasily vs Shamkovich, Leonid — 1-0 — Leningrad RUS
1951 — Bakonyi, Elek vs Borloy, Karoly — 1-0 — HUN-ch
1952 — Bakonyi, Elek vs Arlamowski, Edward — 1/2-1/2 — Miedzyzdroje
1953 — Muller, Hans vs Heilemann, Paul — 0-1 — FRG-ch03 corr5356
1955 — Jaeger, Willy vs Pfeiffer, Gerhard — 1/2-1/2 — Hoechst ch-GER

4.d3 — 0.4% (47 parties)

1965 — Gadia, Olicio vs Rocha, Antonio — 0-1 — Rio de Janeiro BRA
1984 — Wall, Alejandro vs Holsapple, Boyd — 1-0 — Dayton, OH USA
1990 — Bezold, Michael vs Luecke, Norbert — 1-0 — Berlin-Neukolln
1990 — Bezold, Michael vs Miralles, Gilles — 1-0 — Deutschland-Cup
1994 — Siebrecht, Raphaelle vs Flear, Christine — 0-1 — Chambery

4.Nc3 — 0.3% (37 parties)

1994 — Moore, John C vs Eckardt M — 1-0 — ?
1996 — Pulec, Rozic Lea vs Simlova, Kvetuse — 0-1 — ?
1996 — Znuderl, Matej vs Castelluzzo, Salvatore — 1-0 — Portoroz open
1998 — Sosnov, Gennady vs Klimovich, Anatoly — 1/2-1/2 — Moscow RUS
1998 — Fekete, Bela vs Gombar, Janos — 0-1 — Paks HUN

4.b3 — 0.2% (19 parties)

1993 — Korp, Kathrin vs Sarkany, Petra — 0-1 — Europe ch U14 girls
1994 — Martin Ferenc vs Aguado, P — 1-0 — IX TORNEO SAN VIATOR
1997 — Erban, Stepan vs Krska, Vojtech — 0-1 — Svetla nad Sazavou
2004 — Eberth, Manfred vs Beyer, Dietmar — 1/2-1/2 — GER
2005 — Simcik, Jan vs Zidek, Vaclav — 0-1 — Ostrava CZE

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