A26s — English: Closed, 5.d3 d6 6.Nf3 Nf6 7.O-O O-O 8.Rb1 a5

1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.Nf3 Nf6 7.O-O O-O 8.Rb1 a5 * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte e4, case forte b5, case forte d5, case forte g5, paire de fous.
Faiblesses adverses : arriéré f7, Bg7 enfermé, Bc8 enfermé.
Problèmes : Bc1 enfermé, Bg2 enfermé.
Plans :
● Bg5 — Clouer Nf6
● h3 — Empêcher ...Bg4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : case forte b4, case forte d4, case forte g4, case forte e5, case forte f5, avant-poste d4(C), paire de fous.
Faiblesses adverses : Bc1 enfermé, Bg2 enfermé.
Problèmes : Bg7 enfermé, Bc8 enfermé, arriéré f7.
Plans :
● ...Bg4 — Développer Bc8, clouer Nf3
● ...d5 — Rupture
● ...e4 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

A26s — Closed

1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.Nf3 Nf6 7.O-O O-O 8.Rb1 a5

Eval: [+0.26]

Les coups candidats

9.a3 — 88.9% (3706 parties) →

Ambassadeurs : Andersson, Ulf (19x), Kovacs, Arthur Dr. (10x), Klundt, Klaus (8x), Horton, Andrew P (8x), De Coverly, Roger D (8x), Foisor, Cristina-Adela (7x), Van Hoolandt, Patrick (7x), Haub, Thorsten Michael (6x)

9.Bg5 — 4.5% (186 parties)

Ambassadeurs : Rotstein, Arkadij (4x), Moutousis, Konstantinos (3x), Erdelyi, Tamas Dr (2x), Beim, Valeri (2x), Viljava, Tapani (2x), Vitor, Antonio (2x), Kononenko, Tatiana (2x), Krivokapic, Ratko (2x)

9.b3 — 2.7% (111 parties)

Ambassadeurs : Ledger, Andrew J (5x), Kaldarova, Ayaulym (5x), Cox, John J (3x), Hebden, Mark L (3x), Levin, Guy (3x), Kushko, Dmitriy (3x), Injac, Teodora (3x), Grewe, Ludger (2x)

9.Bd2 — 1.6% (68 parties)

Ambassadeurs : Nill, Oliver (2x), Rossetto, Hector (1x), Idigoras, Gregorio (1x), Bielicki, Carlos (1x), Naranja, Renato (1x), Bronstein, Luis Marcos (1x), Brond, Victor (1x), Feustel, Bernd (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	9.a3	9.Bg5	9.b3	9.Bd2
<1800	55	75%	5%	2%	7%
1800-2200	1349	91%	2%	3%	2%
2200-2600	2139	89%	6%	3%	1%
2600+	73	86%	4%	4%	—

Évolution par décennie (% des parties)

Décennie	N parties	9.a3	9.Bg5	9.b3	9.Bd2
1950s	16	81%	6%	—	12%
1960s	42	88%	2%	—	7%
1970s	148	92%	2%	1%	3%
1980s	297	91%	3%	2%	1%
1990s	1004	88%	7%	2%	2%
2000s	1033	90%	4%	2%	2%
2010s	1351	90%	4%	2%	1%
2020s	280	80%	3%	14%	1%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
9.a3	90%	80%	▼ -9.6%
9.Bg5	4%	3%	▼ -1.1%
9.b3	2%	14%	▲ +12.2%
9.Bd2	1%	1%	-0.3%

Joueurs célèbres

Champions du monde dans cette position

Smyslov, Vladimir — 4 parties
Ju, Wenjun — 3 parties
Tal, Mikhail — 2 parties
Anand, Viswanathan — 2 parties
Kasparov, Garry — 1 partie
Kramnik, Vladimir — 1 partie
Gukesh D — 1 partie

Parties historiques

9.a3 — 88.9% (3706 parties)

1954 — Barden, Leonard vs Clarke, Paul R H — 1/2-1/2 — Nottingham ch-BCF
1955 — Pilnik, Herman vs Najdorf, Miguel — 1/2-1/2 — Goteborg SWE
1955 — Palermo, Vicente vs Idigoras, Gregorio — 0-1 — Buenos Aires ARG
1955 — Polugaevsky, Lev vs Arulaid, Alexander — 1/2-1/2 — Voroshilovgrad
1955 — Behrensen, Jorge vs Najdorf, Miguel — 1/2-1/2 — Buenos Aires ARG

9.Bg5 — 4.5% (186 parties)

1957 — Khalilbeili, Sultan vs Giterman, Shlomo — 0-1 — Tbilisi GEO
1964 — Bouwmeester, Hans vs Belkadi, Ridha — 0-1 — Sousse TUN
1970 — Lorenz Torra-Balari, Javier vs Fossier Schmitz, Oscar — 1/2-1/2 — DDR-ch 19th Freiberg
1976 — Doda, Zbigniew vs Ciocaltea, Victor — 1/2-1/2 — Sandomierz Vitrobud POL
1977 — Mortensen, Erling vs Kaiszauri, Konstanty — 1-0 — Tt Gluecksburg GER

9.b3 — 2.7% (111 parties)

1979 — Cederlind Sixten vs Tornefjell, Bjorn — 0-1 — corr SWE/K
1981 — Cox, John J vs Taulbut, Shaun M — 0-1 — Ramsgate
1982 — Cox, John J vs Myreng, Svein G — 1/2-1/2 — Hamar
1982 — Cox, John J vs Norris, Alan J — 0-1 — London, County Hall
1983 — Karlsson, Lars 1937 vs Boey, Josef — 1-0 — Paris FRA

9.Bd2 — 1.6% (68 parties)

1955 — Rossetto, Hector vs Idigoras, Gregorio — 1-0 — Buenos Aires ARG
1959 — Bielicki, Carlos vs Naranja, Renato — 1-0 — Muenchenstein/Basel
1960 — Barcza, Gedeon vs Johansson, Martin 1979 — 1/2-1/2 — Leipzig GER
1967 — Bronstein, Luis Marcos vs Brond, Victor — 0-1 — Cordoba ARG
1969 — Feustel, Bernd vs Schulze, Ulrich — 1/2-1/2 — Hamburg GER

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	● f7
Chaînes	● e2→d3, f2→g3, h2→g3, d3→c4	● d6→e5, c7→d6, f7→g6, h7→g6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e4 (2v1), ● b5 (2v0), ● d5 (2v1), ● g5 (2v0)	● b4 (2v0), ● d4 (2v1), ● g4 (2v0), ● e5 (2v1), ● f5 (2v0)
Cases faibles	—	—
Centre	● d5 (2v1), ● e4 (2v1)	● d4 (2v1), ● e5 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bg2	● Bg2 Enfermé (mob. 2)
Bg7		● Bg7 Enfermé (mob. 2)
Bc8		● Bc8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	1 (c1)	2 (c8, a8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Roqué	● Roqué
Droits de roque	—	—

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	semi-ouvert
Ruptures	● c4-c5, ● d3-d4, ● e2-e3	● …d6-d5, ● …e5-e4

Partie
1955 Argentina – Round 14 – Rossetto, Hector – 1-0 – Idigoras, Gregorio – G97 1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 O-O 5. Nf3 d6 6. O-O Nc6 7. d3 e5 8. Rb1 a5 9. Bd2 Re8 10. e4 Bg4
1957 URS Ch, semi final – Round 1 – Khalilbeili, Sultan – 0-1 – Giterman, Shlomo – G6 1. c4 g6 2. Nc3 Bg7 3. g3 Nf6 4. Bg2 O-O 5. Nf3 d6 6. O-O Nc6 7. Rb1 e5 8. d3 a5 9. Bg5 h6 10. Bd2 Bg4
1959 Wch U20 prel-C – Round 6 – Bielicki, Carlos – 1-0 – Naranja, Renato – G12 1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 d6 6. O-O Nc6 7. d3 e5 8. Rb1 a5 9. Bd2 h6 10. a3 Be6
1960 Olympiad prel III – Round 9 – Barcza, Gedeon – 1/2-1/2 – Johansson, Martin 1979 – G70 1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. O-O O-O 5. c4 d6 6. Nc3 Nc6 7. Rb1 a5 8. d3 e5 9. Bd2 Nh5 10. Qc1 f5
1967 Cordoba Open – Round 4 – Bronstein, Luis Marcos – 0-1 – Brond, Victor – G9 1. g3 g6 2. Bg2 Bg7 3. c4 d6 4. Nc3 Nf6 5. Nf3 O-O 6. O-O Nc6 7. d3 e5 8. Rb1 a5 9. Bd2 Bf5 10. Ne1 Qd7
22. ECU Club Cup 2006 – Round 6 – Minasian, Artashes – 1-0 – Sutovsky, Emil – G137 1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 O-O 5. d3 d6 6. Nf3 e5 7. O-O Nc6 8. Rb1 a5 9. Bg5 h6 10. Bxf6 Qxf6
FIDE WCh KO 2000 – Round 3.4 – Gurevich, Mikhail – 1-0 – Shirov, Alexei – G107 1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 d6 6. O-O Nc6 7. Rb1 a5 8. d3 e5 9. h3 h6 10. e4 Nd7
FIDE WCh KO 2000 – Round 3.6 – Gurevich, Mikhail – 1/2-1/2 – Shirov, Alexei – G110 1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 d6 6. O-O Nc6 7. d3 e5 8. Rb1 a5 9. h3 Nd4 10. Nd2 c6
Linares 1991 – Round 9 – Gelfand, Boris – 1-0 – Anand, Viswanathan – G20 1. Nf3 d6 2. g3 e5 3. Bg2 g6 4. O-O Bg7 5. c4 Nc6 6. Nc3 Nf6 7. d3 O-O 8. Rb1 a5 9. Bg5 h6 10. Bxf6 Bxf6
Olympiad 2002 – Round 12 – Agrest, Evgenij – 1-0 – Annaberdiyev, Meylis – G432 1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O d6 6. Nc3 e5 7. d3 Nc6 8. Rb1 a5 9. h3 Nd4 10. Nd2 c6
World Blitz 2015 – Round 2.56 – Bruzon Batista, Lazaro – 1-0 – Sanal, Vahap – G116 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. d3 g6 5. g3 Bg7 6. Bg2 O-O 7. O-O d6 8. Rb1 a5 9. b3 h6 10. h3 Be6