A20v — English: King’s, 2.g3 Nf6 3.Bg2 Bc5

1.c4 e5 2.g3 Nf6 3.Bg2 Bc5 * ○ Trait aux Blancs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Plans. Nc3 (Développer b1 — 79 % des parties) ; e3 (Solidifier le centre — 12 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plans. ...O-O (Mettre le roi en sécurité, connecter les tours — 42 % des parties) ; ...Nc6 (Développer b8 — 25 % des parties) ; ...c6 (Renforcer le centre — 17 % des parties) ; ...d6 (Libérer Bc8 — 7 % des parties).

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	● d5 (2v1)	● d4 (2v0)
Cases faibles	—	—
Centre	● d5 (2v1)	● d4 (2v0)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bg2	● Bg2 Actif (mob. 7)
Bc5		● Bc5 Actif (mob. 9)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	5 (● b1, ● g1, ● c1, ● a1, ● h1)	4 (● b8, ● c8, ● 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, ● f2-f4	● …d7-d5

Partie
1962 Skopje ch17-YUG – Round 1 – Udovcic, Mijo – 1-0 – Damjanovic, Marko – G1 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 O-O 5. Nf3 Re8 6. O-O Nc6 7. e3 Bf8 8. d4 d6 9. d5 Na5 10. Nd2 c5
1969 Venetie – Round 6 – Medina-Garcia, Antonio – 1-0 – Paoli, Enrico – G4 1. g3 e5 2. Bg2 Nf6 3. c4 Bc5 4. Nc3 O-O 5. d3 Re8 6. Nf3 d6 7. O-O Bd7 8. Rb1 a5 9. Ne1 c6 10. Nc2 Na6
34. ECC Open 2018 – Round 6.9 – Edouard, Romain – 0-1 – Admiraal, Miguoel – G198 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 Nc6 5. Nf3 d6 6. Nc3 h6 7. a3 a6 8. b4 Ba7 9. Bb2 O-O 10. e3 Be6
43. Olympiad 2018 – Round 1.7 – Melkumyan, Hrant – 1-0 – Nanjo, Ryosuke – G67 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 O-O 5. e3 Nc6 6. Nge2 Re8 7. O-O a6 8. d4 exd4 9. exd4 Ba7 10. Be3 d5
43. Olympiad 2018 – Round 7.5 – Rodshtein, Maxim – 1-0 – Laznicka, Viktor – G478 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 O-O 5. e3 Re8 6. Nge2 Nc6 7. O-O e4 8. d3 exd3 9. Qxd3 d6 10. b3 Bg4
6. Norway Blitz 2018 – Round 5.1 – Carlsen, Magnus – 1/2-1/2 – Ding, Liren – G21 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 c6 5. e3 O-O 6. Nge2 d5 7. cxd5 Nxd5 8. d4 exd4 9. Nxd5 cxd5 10. Nxd4 Nc6
82. Tata Steel GpA 2020 – Round 5.2 – Caruana, Fabiano – 1/2-1/2 – Van Foreest, Jorden – G28 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 c6 5. Nf3 e4 6. Nh4 d5 7. cxd5 cxd5 8. d3 Ng4 9. O-O g5 10. dxe4 gxh4
Croatia GCT 2019 – Round 1.3 – So, Wesley – 1-0 – Ding, Liren – G3 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 c6 5. e3 O-O 6. Nge2 d5 7. cxd5 Nxd5 8. d4 exd4 9. Nxd5 cxd5 10. exd4 Bb6
FIDE Candidates 2020 – Round 1.2 – Ding, Liren – 0-1 – Wang, Hao(ZJWZ) – G2 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 O-O 5. Nc3 c6 6. Nf3 d6 7. O-O Re8 8. Na4 Bb4 9. a3 Ba5 10. b4 Bc7
FIDE Candidates 2020 – Round 1.4 – Grischuk, Alexander – 1/2-1/2 – Alekseenko, Kirill – G4 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 d5 5. cxd5 Nxd5 6. Nc3 Nxc3 7. bxc3 O-O 8. Qc2 Nc6 9. Nf3 h6 10. O-O Rb8
FIDE Candidates 2022 – Round 7.3 – Ding, Liren – 1/2-1/2 – Firouzja, Alireza – G27 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 O-O 5. Nc3 c6 6. Nf3 d6 7. O-O a5 8. d4 exd4 9. Nxd4 a4 10. Rb1 Qa5
FIDE World Cup 2019 – Round 2.4 – Gelfand, Boris – 1/2-1/2 – Matlakov, Maxim – G273 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 d5 5. cxd5 Nxd5 6. Nf3 Nc6 7. O-O O-O 8. a3 a5 9. Nxe5 Bxf2+ 10. Rxf2 Nxe5
FIDE World Cup 2019 – Round 5.2 – Ding, Liren – 1-0 – Grischuk, Alexander – G399 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 d5 5. cxd5 Nxd5 6. Nc3 Nb6 7. Nf3 Nc6 8. O-O O-O 9. a3 a5 10. Na4 Nxa4
FIDE World Cup 2025 – Round R1 Classical 1 – Tin Jingyao – 1/2-1/2 – Lashkin Jegor – G55 1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. d4 Nf6 5. O-O O-O 6. c4 dxc4 7. Na3 c5 8. dxc5 c3 9. Nb5 Na6 10. Nxc3 Nxc5
FTX Crypto Cup 2022 – Round 6.5 – Carlsen, Magnus – 1-0 – Firouzja, Alireza – G94 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 O-O 5. Nf3 d6 6. Nc3 c6 7. O-O a5 8. d4 exd4 9. Nxd4 a4 10. e3 a3
Saint Louis Rapid 2018 – Round 9.3 – Mamedyarov, Shakhriyar – 1-0 – Anand, Viswanathan – G43 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 O-O 5. e3 Re8 6. Nge2 d6 7. O-O c6 8. b3 Bb6 9. Ba3 Bf5 10. d4 e4
Superbet Classic 2021 – Round 4.1 – So, Wesley – 1-0 – Caruana, Fabiano – G14 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 c6 5. Nf3 d6 6. O-O O-O 7. Nc3 a5 8. d4 exd4 9. Nxd4 a4 10. Rb1 Re8
Tata Steel India Blitz 2019 – Round 10.4 – Nepomniachtchi, Ian – 1-0 – Anand, Viswanathan – G48 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 c6 5. e4 d6 6. Nge2 Ng4 7. O-O h5 8. Na4 h4 9. Nxc5 hxg3 10. hxg3 dxc5
Tata Steel India Blitz 2019 – Round 15.4 – Giri, Anish – 1-0 – Anand, Viswanathan – G73 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 c6 5. Nf3 d6 6. Nc3 O-O 7. O-O a5 8. b3 Re8 9. e3 Bf5 10. h3 h6
Tata Steel India Blitz 2022 – Round 1.2 – Gukesh D – 0-1 – Mamedyarov, Shakhriyar – G2 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. d3 O-O 5. Nf3 Re8 6. O-O c6 7. Nc3 d6 8. b3 a5 9. Bb2 Bf5 10. e3 Nbd7
Tata Steel India Rapid 2019 – Round 3.4 – Nepomniachtchi, Ian – 1-0 – Anand, Viswanathan – G14 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 c6 5. Nf3 e4 6. Nh4 d5 7. d4 Be7 8. cxd5 cxd5 9. O-O O-O 10. f3 exf3
World Blitz 2016 – Round 3.18 – Nakamura, Hikaru – 1-0 – Mareco, Sandro – G104 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 d6 5. e3 O-O 6. Nge2 a6 7. b3 Re8 8. Bb2 Nc6 9. d3 Ba7 10. Qd2 Bf5
World Blitz 2019 – Round 17.44 – Nikolov, Nikolay Petrov – 1/2-1/2 – Gajewski, Grzegorz – G1153 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 c6 5. Nf3 e4 6. Nh4 d5 7. d3 exd3 8. cxd5 cxd5 9. Qxd3 d4 10. Ne4 Bb4+
World Blitz 2023 – Round 6.43 – Iturrizaga Bonelli, Eduardo – 1-0 – Aditya Mittal – G361 1. c4 Nf6 2. g3 e5 3. Bg2 Bc5 4. Nc3 c6 5. e3 d5 6. cxd5 cxd5 7. d4 exd4 8. exd4 Bb4 9. Ne2 h6 10. O-O O-O
World Rapid 2019 – Round 1.16 – Nikolov, Nikolay Petrov – 0-1 – Jakovenko, Dmitry – G9 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 c6 5. Nf3 e4 6. Nh4 d5 7. d3 Ng4 8. O-O g5 9. d4 Be7 10. f3 Nxh2
World Rapid 2019 – Round 5.26 – Ganguly, Surya Shekhar – 1/2-1/2 – Jakovenko, Dmitry – G312 1. c4 e5 2. g3 Nf6 3. Bg2 Bc5 4. Nc3 c6 5. e3 Bb6 6. d4 exd4 7. exd4 d5 8. cxd5 Nxd5 9. Nxd5 cxd5 10. Ne2 Nc6

A20v — King’s (1962)

1.c4 e5 2.g3 Nf6 3.Bg2 Bc5

Les coups candidats

4.Nc3 — 78.8% (2565 parties)

Ambassadeurs : Rutter, Blair A (12x), Weyerstrass, Ronald (9x), Kerr, Stephen G.R. (9x), Malewicz, Frank (9x), Heberla, Bartlomiej (7x), Beavan, Robert (7x), Gierth, Karlheinz (6x), Artemiev, Vladislav (6x)

4.e3 — 12.2% (397 parties)

Ambassadeurs : Thiel, Kay (6x), Hanken, Jerome B (3x), Hickl, Norbert (3x), Frömbgen, Andreas (3x), Motley, Gisele (2x), Greer, Ken (2x), Manger, Erika (2x), Borensztajn, David (2x)

4.d3 — 4.4% (142 parties)

Ambassadeurs : Misericordia, Antonio (6x), Knittel, Martin (5x), Huang, Renjie (3x), Liu, Yan (2x), Gorshtein, Ido (2x), Adhiban, B. (2x), Ding, Liren (2x), Vakhidov, Jakhongir (2x)

4.Nf3 — 3.0% (98 parties)

Ambassadeurs : Hoffmann, Wolfgang (2x), Lengyel, Laszlo (1x), Bruzzi, Stefano (1x), Penot, Y. (1x), Thiellement, Andre (1x), Gorka, Tobias (1x), Hernando Garcia, Antonio (1x), Yanez Acin, Gonzalo (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4.Nc3	4.e3	4.d3	4.Nf3
<1800	494	70%	19%	3%	5%
1800-2200	1347	80%	12%	3%	4%
2200-2600	832	87%	4%	7%	1%
2600+	62	76%	3%	21%	—

Évolution par décennie (% des parties)

Décennie	N parties	4.Nc3	4.e3	4.d3	4.Nf3
1950s	2	100%	—	—	—
1960s	18	78%	11%	6%	6%
1970s	14	71%	21%	—	7%
1980s	19	84%	16%	—	—
1990s	179	70%	22%	2%	4%
2000s	741	78%	14%	2%	4%
2010s	1582	82%	12%	2%	3%
2020s	700	76%	8%	13%	3%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4.Nc3	82%	76%	▼ -5.7%
4.e3	12%	8%	▼ -3.6%
4.d3	2%	13%	▲ +10.5%
4.Nf3	3%	3%	-0.1%

Joueurs célèbres

Champions du monde dans cette position

Ding, Liren — 5 parties
Anand, Viswanathan — 5 parties
Carlsen, Magnus — 2 parties
Ju, Wenjun — 2 parties
Kramnik, Vladimir — 1 partie
Gukesh D — 1 partie

Parties historiques

4.Nc3 — 78.8% (2565 parties)

1957 — Kaikamdzozov, Jivko vs Milev, Zdravko — 0-1 — Sofia BUL
1958 — Beisheim, Karl vs Neufahrt, Gerhard — 1/2-1/2 — Vancouver
1960 — Koenig, Imre vs Kashdan, Isaac — 0-1 — ?
1961 — Collins, Richard vs Dunne, J F. — 1-0 — ?
1962 — Udovcic, Mijo vs Damjanovic, Mato — 1-0 — Skopje ch17-YUG

4.e3 — 12.2% (397 parties)

1967 — Bruce, Rowena M vs Dobson-Norman, Dinah Margaret — 1/2-1/2 — London, Northwood
1969 — Berry, Jonathan vs Montchalin, Mike — 1/2-1/2 — Walla Walla
1971 — Binet Tapaszto, Laszlo vs Quillen, Paul — 1-0 — Ventura
1974 — Johannessen, Svein vs Van Seters, Frits — 1-0 — Nice olm fin-B
1978 — Baltgailis, Vesma vs Salazar, Taide — 1/2-1/2 — Buenos Aires ARG

4.d3 — 4.4% (142 parties)

1960 — Collins, Richard vs Mathews, Robert — 0-1 — Hayes
1996 — Bucher, Rolf vs Manievich, Victor — 0-1 — Bern open
1996 — Piotrowski, Arkadiusz vs Pietrusiak, K. — 1-0 — Augustow
1997 — Roijers, Diederik vs Hemmer, Anne Fleur — 0-1 — ?
1999 — Sutkovic, Damir vs Zunic, Muzafer — 1-0 — Zadar CRO

4.Nf3 — 3.0% (98 parties)

1960 — Lengyel, Laszlo vs Bruzzi, Stefano — 1/2-1/2 — Reggio Emilia ITA
1972 — Penot, Y. vs Thiellement, Andre — 0-1 — Paris FRA
1993 — Gabriel y Galin, J. vs Munoz Barrera, Antonio Luis — 1/2-1/2 — Villalba
1994 — Hoffmann, Wolfgang vs Gorka, Tobias — 0-1 — Bad Driburg
1994 — Whitaker, Cooper vs Allen, David — 1/2-1/2 — Detroit, MI USA

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