A20a — English: King’s (1…e5)

1.c4 e5 * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : paire de fous.
Faiblesses adverses : Bc8 enfermé, Bf8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, Bf1 enfermé, 6 pièces non développées (B1, G1, C1, F1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● e4 — Centre d4+e4, libère Bf1
● Nc3 — Développer Nb1
● Nf3 — Développer Ng1
● d3 — Libérer Bc1

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : paire de fous.
Faiblesses adverses : Bc1 enfermé, Bf1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, Bf8 enfermé, 6 pièces non développées (B8, G8, C8, F8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...d6 — Libérer Bc8
● ...Nc6 — Développer Nb8
● ...Nf6 — Développer Ng8
● ...Be7 — Développer Bf8

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

A20a — King’s (1…e5)

1.c4 e5

Eval: [+0.20]

Les coups candidats

2.Nc3 — 69.0% (119296 parties) →

Ambassadeurs : Miezis, Normunds (333x), Zielinski, Sergej (275x), Uhlmann, Wolfgang (237x), Vetter, Udo (231x), ? (229x), McNab, Colin A (155x), Morley, Paul (155x), Korchnoi, Viktor (145x)

2.g3 — 26.5% (45839 parties) →

Ambassadeurs : Suba, Mihai (111x), Foisor, Cristina-Adela (94x), Bonoldi, Fabio (89x), Almarza Mato, Carlos (88x), Owens, Johnny (84x), Zwardon, Vojtech (81x), Weyerstrass, Ronald (80x), Golcman, Evgeny (73x)

2.Nf3 — 1.1% (1977 parties) →

Ambassadeurs : Cardoso García, Sergio (89x), Rakhmanov, Aleksandr (73x), Cardoso, Sergio Carlos de Almeida (59x), Murey, Jacob (41x), Kermer, Wolf Dieter Dr (24x), Lisenko, Alexander V (22x), Romig, James (18x), Fine, Reuben (14x)

2.d3 — 1.0% (1784 parties) →

Ambassadeurs : Demeter, Peter (39x), Bocharov, Dmitry (28x), Groh, Jiri (24x), Csom, Istvan (23x), Reimann, Guenther (18x), Gumularz, Szymon (16x), Korobov, Anton (15x), Timofeev, Artyom (13x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	2.Nc3	2.g3	2.Nf3	2.d3
<1800	7199	70%	24%	1%	1%
1800-2200	59668	67%	29%	1%	1%
2200-2600	61738	64%	32%	1%	1%
2600+	3449	60%	32%	2%	4%

Évolution par décennie (% des parties)

Décennie	N parties	2.Nc3	2.g3	2.Nf3	2.d3
1810s	1	100%	—	—	—
1840s	2	100%	—	—	—
1850s	18	33%	—	—	—
1860s	8	38%	—	—	—
1870s	15	27%	—	—	—
1880s	21	19%	—	—	—
1890s	13	54%	—	—	—
1900s	37	84%	3%	—	—
1910s	35	89%	9%	—	—
1920s	215	72%	3%	20%	—
1930s	452	82%	2%	15%	0%
1940s	419	86%	5%	8%	0%
1950s	914	89%	5%	4%	1%
1960s	1965	87%	9%	3%	0%
1970s	4244	92%	6%	1%	0%
1980s	7797	84%	13%	1%	0%
1990s	27849	80%	16%	1%	1%
2000s	45279	72%	23%	1%	1%
2010s	64120	60%	35%	1%	1%
2020s	19580	60%	34%	1%	2%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
2.Nc3	60%	60%	-0.0%
2.g3	35%	34%	▼ -1.2%
2.Nf3	1%	1%	+0.2%
2.d3	1%	2%	▲ +1.3%

Joueurs célèbres

Champions du monde dans cette position

Lasker, Emanuel — 10 parties
Euwe, Max — 10 parties
Alekhine, Alexander — 10 parties
Smyslov, Vladimir — 10 parties
Botvinnik, Mikhail — 10 parties
Karpov, Anatoly — 10 parties
Karpov, Aleksandr — 10 parties
Tal, Mikhail — 10 parties
Kasparov, Garry — 10 parties
Anand, Viswanathan — 10 parties
Kramnik, Vladimir — 10 parties
Carlsen, Magnus — 10 parties
Ju, Wenjun — 10 parties
Ding, Liren — 10 parties
Gukesh D — 10 parties
Steinitz, Wilhelm — 9 parties
Hou, Yifan — 8 parties
Fischer, Robert James — 1 partie

Parties historiques

2.Nc3 — 69.0% (119296 parties)

1816 — Isaacson, Gunnar J vs Bishop, Lloyd — 1-0 — Gainesville
1849 — Horwitz, Bernhard vs Harrwitz, Daniel — 0-1 — Brighton ENG
1849 — Horwitz, Bernhard vs Harrwitz, Daniel — 1/2-1/2 — Brighton ENG
1851 — Arkebe Kemal Kennedy vs Mayet, Carl — 1-0 — London ENG
1853 — Sutton, John Dr vs Philipp, W. — 1-0 — cr meestertm

2.g3 — 26.5% (45839 parties)

1906 — Curt, Elmin vs Raubitschek, Robert — 1/2-1/2 — Trenton Falls
1910 — Nimzowitsch, Aron vs Schlechter, Carl — 0-1 — Hamburg GER
1912 — Carls, Carl vs Suechting, Hugo — 0-1 — Hamburg GER
1912 — Carls, Carl vs Suechting, Hugo — 1/2-1/2 — Hamburg GER
1923 — Barker, W. vs Pratten, Wilfred Henry — 1/2-1/2 — Southsea

2.Nf3 — 1.1% (1977 parties)

1921 — Tartakower, Savielly vs Gruenfeld, Ernst — 1/2-1/2 — Vienna m4 Vienna AUT
1923 — Tartakower, Savielly vs Gruenfeld, Ernst — 1/2-1/2 — Maehrisch Ostrau
1923 — Tartakower, Savielly vs Spielmann, Rudolf — 1-0 — Carlsbad CZE
1924 — Nimzowitsch, Aron vs Giersing, JKinch, S — 1/2-1/2 — Copenhagen DEN
1925 — Reti, Richard vs De La Torre Huertas, Carlos — 0-1 — Marienbad CZE

2.d3 — 1.0% (1784 parties)

1939 — Ragozin, Viacheslav vs Kan, Ilya A — 0-1 — Leningrad RUS
1947 — Stoeckl, Ernst vs Kellner, Adolf — 1/2-1/2 — Vienna AUT
1947 — Abramov, Lev vs Podolny, Evgeni — 1-0 — Moscow RUS
1950 — Canali, Adrien vs Magrin, Antonio — 1/2-1/2 — Milan ITA
1951 — Larsen, Bent vs Hammartang, Agne — 1-0 — Trondheim NOR

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	—
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	—
Cases faibles	—	—
Centre	● d5 (1v0)	● d4 (1v0)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bf1	● Bf1 Non développé (mob. 0)
Bc8		● Bc8 Non développé (mob. 0)
Bf8		● Bf8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	6 (b1, g1, c1, f1, a1, h1)	6 (b8, g8, 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	semi-ouvert
Ruptures	● c4-c5, ● d2-d3, ● e2-e3, ● f2-f3	● …c7-c6, ● …c7-c5, ● …d7-d6, ● …d7-d5, ● …e5-e4, ● …f7-f6, ● …f7-f5

Partie
1924 New York – Round 1 – Tartakower, Savielly – 0-1 – Lasker, Emanuel – G3 1. c4 e5 2. a3 Nf6 3. e3 Be7 4. Qc2 O-O 5. Nc3 d6 6. Nf3 Re8 7. Be2 Bf8 8. O-O Nc6 9. d4 Bg4 10. d5 Ne7
1926 DSV Kongress – Round 5 – Duenmann, Arthur – 1/2-1/2 – Wolf, Siegfried – G17 1. c4 e5 2. b3 d6 3. Bb2 Nh6 4. e3 Nc6 5. Nc3 Bf5 6. h3 Be7 7. g4 Bg6 8. e4 Nd4 9. Bg2 Ng8 10. Nge2 Nxe2
1949 Budapest-Moscow – Round 9 – Barcza, Gedeon – 0-1 – Bronstein, David I – G63 1. c4 e5 2. a3 Nf6 3. d3 a5 4. Nc3 d6 5. Nf3 Nbd7 6. e3 g6 7. Bd2 Bg7 8. b4 axb4 9. axb4 Rxa1 10. Qxa1 O-O
1961 Balcarce – Round 1 – Pelikan, Jan – 1-0 – Latorre Artal, Hector – G3 1. c4 e5 2. b3 Bc5 3. e3 Nc6 4. Bb2 Nf6 5. a3 a5 6. Qc2 d6 7. Nc3 Be6 8. Nf3 h6 9. Bd3 Qd7 10. Ne4 Ba7
1968 Hungary – Round 1 – Barcza, Gedeon – 1/2-1/2 – Honfi, K. – G4 1. c4 e5 2. a3 Nf6 3. e3 d6 4. Nc3 g6 5. Nf3 Bg7 6. Be2 O-O 7. O-O Nbd7 8. Qc2 Qe7 9. d3 c6 10. Bd2 Nh5
GCT Blitz Paris 2016 – Round 10.4 – Topalov, Veselin – 1/2-1/2 – Aronian, Levon – G49 1. c4 e5 2. b3 Nf6 3. Bb2 Nc6 4. e3 g6 5. d3 Bg7 6. Nf3 d6 7. Be2 O-O 8. a3 Nd7 9. Nc3 a5 10. O-O Re8
Hoogovens Blitz 1999 – Round 11 – Bosboom, Manuel – 1-0 – Van Wely, Loek – G33 1. c4 e5 2. a3 Nf6 3. e3 c6 4. Nf3 e4 5. Nd4 d5 6. cxd5 cxd5 7. d3 a6 8. Nc3 Bd6 9. dxe4 dxe4 10. Be2 O-O
Interpolis 1984 – Round 1 – Miles, Anthony J – 1-0 – Sosonko, Gennadi – G2 1. c4 e5 2. Qc2 Nf6 3. e3 Nc6 4. a3 g6 5. b4 Bg7 6. Bb2 d6 7. Nc3 O-O 8. d3 a5 9. b5 Ne7 10. Nf3 Nd7
Niksic 1983 – Round 9 – Larsen, Bent – 1-0 – Seirawan, Yasser – G57 1. c4 e5 2. b3 g6 3. Bb2 Bg7 4. g3 c5 5. Bg2 Ne7 6. Nc3 Nbc6 7. d3 d6 8. e3 Be6 9. Nd5 Bxd5 10. cxd5 Nb4
Norway Supreme Masters Blitz 2013 – Round 1.1 – Nakamura, Hikaru – 1-0 – Hammer, Jon Ludvig – G1 1. c4 e5 2. a3 Nf6 3. e3 c6 4. Nf3 e4 5. Nd4 d5 6. cxd5 cxd5 7. d3 Nc6 8. Nxc6 bxc6 9. Qc2 Bd7 10. Nd2 exd3
Norway Supreme Masters Blitz 2013 – Round 8.2 – Nakamura, Hikaru – 1-0 – Wang, Hao(ZJWZ) – G37 1. c4 e5 2. a3 Nf6 3. e3 c6 4. Nf3 e4 5. Nd4 d5 6. cxd5 cxd5 7. d3 Bc5 8. Nc3 O-O 9. Be2 exd3 10. Qxd3 Nc6
Saint Louis Blitz 2022 – Round 1.1 – Nakamura, Hikaru – 1-0 – Caruana, Fabiano – G1 1. c4 e5 2. a3 Nc6 3. Nc3 f5 4. g3 Nf6 5. Bg2 a5 6. e3 d6 7. d4 Be7 8. Nge2 O-O 9. O-O Kh8 10. Rb1 Qe8
Saint Louis Blitz 2022 – Round 18.5 – Nakamura, Hikaru – 1-0 – Xiong, Jeffery – G90 1. c4 e5 2. a3 Nf6 3. d3 g6 4. Nf3 Nc6 5. b4 d5 6. cxd5 Nxd5 7. Bb2 Bg7 8. e3 Qe7 9. Nbd2 O-O 10. Rc1 Rd8
Saint Louis Blitz 2022 – Round 8.4 – Nakamura, Hikaru – 1/2-1/2 – Nepomniachtchi, Ian – G39 1. c4 e5 2. a3 c6 3. d4 exd4 4. Nf3 d5 5. Nxd4 Nf6 6. cxd5 Nxd5 7. e4 Nf6 8. f3 Bc5 9. Be3 O-O 10. Nc3 Re8
Saint Louis Rapid 2021 – Round 4.5 – Rapport, Richard – 1/2-1/2 – Svidler, Peter – G20 1. c4 e5 2. b3 Nf6 3. Bb2 Nc6 4. Nf3 e4 5. Nd4 Bc5 6. Nf5 O-O 7. e3 d5 8. cxd5 Nb4 9. Ng3 Nbxd5 10. Nc3 Re8
Saint Louis Rapid 2022 – Round 9.1 – Nakamura, Hikaru – 0-1 – Caruana, Fabiano – G41 1. c4 e5 2. a3 Nf6 3. d3 c6 4. Nf3 Bd6 5. Bg5 Bc7 6. Nc3 h6 7. Bh4 d6 8. e3 O-O 9. Be2 Bf5 10. d4 Nbd7
Tata Steel India Blitz 2022 – Round 18.1 – Nakamura, Hikaru – 1-0 – Praggnanandhaa R – G83 1. c4 e5 2. a3 Nf6 3. d3 c6 4. Nf3 Bd6 5. Bg5 h6 6. Bh4 Bc7 7. Nc3 d6 8. e3 Nbd7 9. d4 Qe7 10. Be2 Nf8
World Blitz 2022 – Round 21.3 – Nakamura, Hikaru – 1/2-1/2 – Harikrishna, Pentala – G1114 1. c4 e5 2. a3 Nf6 3. d3 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. e4 Nb6 7. Be2 Be7 8. Be3 O-O 9. O-O Kh8 10. b4 a6
World Blitz 2022 – Round 6.2 – Nakamura, Hikaru – 1-0 – Caruana, Fabiano – G296 1. c4 e5 2. a3 c6 3. d4 e4 4. d5 f5 5. Nc3 d6 6. dxc6 bxc6 7. Bf4 Nf6 8. e3 Be7 9. h3 O-O 10. Nge2 a5

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