Structure de pions
♔ Blancs ♚ Noirs
Pions doublés
Pions isolés
Arriérés
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 (3v0), ● b5 (2v0), ● d5 (3v0) ● b4 (2v0), ● d4 (2v0), ● f5 (2v0)
Cases faibles
Centre ● d5 (3v0), ● e4 (3v0) ● d4 (2v0), ● e5 (3v0)
Colonnes et diagonales
♔ Blancs ♚ Noirs
Pièces
♔ Blancs ♚ Noirs
Bc1 ● Bc1 Non développé (mob. 5)
Bg2 ● Bg2 Actif (mob. 6)
Bg7 ● Bg7 Ok (mob. 3)
Bc8 ● Bc8 Non développé (mob. 5)
Paire de fous ● Oui ● Oui
Non développées 3 (● g1, ● c1, ● h1) 4 (● g8, ● c8, ● a8, ● h8)
Sécurité du roi
♔ Blancs ♚ Noirs
Statut ● Au centre ● Au centre
Droits de roque O-O O-O / O-O-O
Thèmes
♔ Blancs ♚ Noirs
Phase Ouverture
Centre mobile
Ruptures ● c4-c5, ● d3-d4, ● f2-f4 ● …d6-d5, ● …e5-e4

A26g — English: Closed, 5.d3 d6 6.Rb1 a5

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

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1
bR
bB
bQ
bK
bN
bR
bP
bP
bP
bB
bP
bN
bP
bP
bP
Case forte (2v0)
Case forte (3v0)
bP
wP
Case forte (3v0)
wN
wPPion central
wP
wP
wP
wP
wP
wBFou actif — mobilité 6
wP
wR
wBFou actif — mobilité 5
wQ
wK
wN
wR
abcdefgh
Plans. a3 (Préparer expansion aile dame — 72 % des parties) ; e3 (Solidifier le centre — 18 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8
wR
wN
wK
wQ
wB
wR
wP
wB
wP
wP
wP
wP
wP
wP
wN
Avant-poste C (accessible)
wP
Case forte (2v0)
Case forte (2v0)
bP
bP
bP
bP
bN
bP
bB
bP
bP
bP
bR
bN
bK
bQ
bBFou actif — mobilité 5
bR
hgfedcba
Plans. ...f5 (Attaque à l'aile roi — 29 % des parties) ; ...Nf6 (Développer g8 — 28 % des parties) ; ...Nge7 (Développer g8 — 21 % des parties) ; ...Be6 (Fou actif (mobilité 7), Développer c8 — 14 % des parties).
Avantages
Faiblesses
Diagonale active
Plans
Partie
1957 Leningrad Ch – Round 9 – Zilber, Israel – 1/2-1/2 – Mnatsakanian, Eduard A – G67
1. c4 e5 2. Nc3 d6 3. g3 g6 4. Bg2 Nc6 5. Rb1 a5 6. d3 Bg7 7. e3 Nge7 8. a3 Be6 9. Nd5 Qd7 10. b4 axb4
1961 Oberhausen etc – Round 2 – Botvinnik, Mikhail – 1/2-1/2 – Gligorić, Svetozar – G58
1. c4 g6 2. g3 Bg7 3. Bg2 d6 4. Nc3 e5 5. d3 Nc6 6. Rb1 a5 7. a3 Nf6 8. b4 axb4 9. axb4 O-O 10. b5 Ne7
1962 Capablanca Memorial – Round 18 – Najdorf, Miguel – 1-0 – Milev, Zdravko – G177
1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Rb1 a5 7. a3 f5 8. e3 Nf6 9. Nge2 O-O 10. O-O Be6
1963 URS Team Ch Moscow RUS – Round 1 – Khanov, Kurban – 1-0 – Khalilbeili, Sultan – G3
1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Rb1 a5 7. a3 f5 8. b4 axb4 9. axb4 Nf6 10. b5 Ne7
1965 Hamburg etc – Round 5 – Barcza, Gedeon – 1-0 – Gunsberger, Alexander – G83
1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. d3 d6 7. f4 Nge7 8. Nf3 Nd4 9. O-O O-O 10. Ne1 c6
1965 Tallinn ch-URS – Round 1 – Sakharov, Yuri G. – 1-0 – Kuzmin, Gennadiy – G17
1. c4 g6 2. Nc3 Bg7 3. g3 d6 4. Bg2 e5 5. d3 Nc6 6. Rb1 a5 7. a3 Nge7 8. b4 axb4 9. axb4 O-O 10. b5 Nd4
1966 Palma de Mallorca – Round 10 – O'Kelly, Albéric de Galway – 1-0 – Medina-Garcia, Antonio – G56
1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Rb1 a5 7. e4 Nge7 8. Nge2 Be6 9. Nd5 Nb4 10. Bg5 Nbxd5
1966 Sochi Chigorin Memorial 04th – Round 1 – Barcza, Gedeon – 0-1 – Polugaevsky, Lev – G2
1. c4 g6 2. g3 Bg7 3. Bg2 e5 4. Nc3 d6 5. d3 Nc6 6. Rb1 a5 7. e3 Nge7 8. Nge2 h5 9. Nd5 Nxd5 10. cxd5 Ne7
1968 Sarajevo – Round 12 – Ivkov, Borislav – 1/2-1/2 – Bogdanovic, Radivoje – G82
1. c4 g6 2. g3 Bg7 3. Bg2 e5 4. Nc3 d6 5. d3 Nc6 6. Rb1 a5 7. a3 Nge7 8. e3 O-O 9. Nge2 Be6 10. Nd5 Qd7
1969 Sweden – Round 1 – Platzack, S. – 1/2-1/2 – Skold, Kristian – G13
1. g3 e5 2. Bg2 g6 3. c4 Bg7 4. Nc3 d6 5. d3 Nc6 6. Rb1 a5 7. a3 Nge7 8. e3 Be6 9. Nd5 Qd7 10. b4 axb4
Amber-rapid 3rd 1994 – Round 1 – Ivanchuk, Vasyl – 1-0 – Nunn, John D M – G1
1. c4 g6 2. Nc3 Bg7 3. g3 e5 4. Bg2 Nc6 5. d3 d6 6. Rb1 a5 7. a3 f5 8. b4 axb4 9. axb4 Nf6 10. Nf3 O-O
Biel Interzonal 1993 – Round 1 – Xu, Jun(SD) – 0-1 – Korchnoi, Viktor – G1
1. c4 e5 2. d3 g6 3. g3 Bg7 4. Bg2 d6 5. Nc3 Nc6 6. Rb1 a5 7. a3 Nge7 8. b4 axb4 9. axb4 O-O 10. b5 Nd4
Linares 1991 – Round 1 – Ehlvest, Jaan – 0-1 – Karpov, Anatoly – G1
1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Rb1 a5 7. e3 Nf6 8. Nge2 h5 9. h3 O-O 10. b3 Be6
Rio de Janeiro Interzonal 1979 – Round 15 – Shamkovich, Leonid, Leonid – 1/2-1/2 – Balashov, Yuri S – G45
1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Rb1 a5 7. a3 Nf6 8. e3 O-O 9. Nge2 Ne7 10. O-O d5

A26g — Closed (1957)
1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.Rb1 a5
Les coups candidats
7.a3 — 70.3% (478 parties)
Ambassadeurs : Snape, Ian L (6x), Foisor, Ovidiu-Doru (4x), Reizniece, Dana (4x), Gallagher, Joseph G. (4x), Sunye Neto, Jaime (4x), Andersson, Ulf (3x), Van Hoolandt, Patrick (3x), Deodhar, Vrushali Umesh (3x)
7.e3 — 17.4% (118 parties)
Ambassadeurs : Giardelli, Sergio C. (3x), Gagunashvili, Merab (3x), Piket, Jeroen (2x), Jussupow, Artur (2x), Foisor, Cristina-Adela (2x), Zilber, Israel (1x), Mnatsakanian, Eduard A (1x), Anay Barche (1x)
7.Nf3 — 7.1% (48 parties)
Ambassadeurs : Plante, Jacques (1x), Mazzoni, Guy (1x), Dobrzynski, Wojciech (1x), Gromek, Jozef (1x), Stekel Grunberg, Moises (1x), Trois, Francisco R.T. (1x), Vassiljev Igor (1x), Piarnpuu, Leili (1x)
7.e4 — 2.5% (17 parties)
Ambassadeurs : Kobalia, Mikhail (2x), O'Kelly, Albéric de Galway (1x), Medina-Garcia, Antonio (1x), Zaichik, Gennadi (1x), Sturua, Zurab (1x), Makarichev, Sergey (1x), Milos, Gilberto (1x), Slipak, Sergio (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 7.a3 7.e3 7.Nf3 7.e4
<1800 16 81% 12% 6%
1800-2200 188 76% 11% 7% 2%
2200-2600 400 70% 20% 5% 3%
2600+ 21 43% 33% 14% 10%
Évolution par décennie (% des parties)
Décennie N parties 7.a3 7.e3 7.Nf3 7.e4
1950s 1 100%
1960s 13 69% 8% 8% 8%
1970s 26 81% 8% 8%
1980s 45 67% 24% 2%
1990s 165 69% 16% 7% 4%
2000s 220 73% 18% 5% 3%
2010s 151 70% 16% 11% 1%
2020s 59 66% 24% 8%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
7.a3 70% 66% ▼ -3.4%
7.e3 16% 24% ▲ +7.8%
7.Nf3 11% 8% ▼ -2.1%
7.e4 1% 0% ▼ -1.3%
Joueurs célèbres
Champions du monde dans cette position
Karpov, Anatoly — 3 parties
Botvinnik, Mikhail — 1 partie
Parties historiques
7.a3 — 70.3% (478 parties)
1961 — Botvinnik, Mikhail vs Gligoric, Sofija — 1/2-1/2 — Oberhausen etc
1961 — Milic, Borislav vs Gligorić, Svetozar — 1/2-1/2 — Belgrade SRB
1962 — Miguel, Nahuel vs Milev, Zdravko — 1-0 — Havana CUB
1963 — Khanov, Kurban vs Khalilbeili, Sultan — 1-0 — URS-chT Moscow RUS
1965 — Sakharov, Yuri N vs Kuzmin, Gennadi — 1-0 — Tallinn ch-URS
7.e3 — 17.4% (118 parties)
1957 — Zilber, Israel vs Mnatsakanian, Eduard A — 1/2-1/2 — Leningrad RUS
1966 — Anay Barche vs Polugaevsky, Lev — 0-1 — Sochi RUS
1971 — Masic, Ljubomir vs Zinn, Lothar — 1-0 — Baja
1975 — Sanz Alonso, Francisco Javier vs San Sebastian Vicioso, Carlos — 1-0 — Benidorm
1980 — Speelman, Jon S vs Jussupow, Artur — 1/2-1/2 — Mexico City MEX
7.Nf3 — 7.1% (48 parties)
1969 — Plante, Jacques vs Mazzoni, Guy — 1/2-1/2 — Pau
1975 — Stekel Grunberg, Moises vs Trois, Francisco R.T. — 1/2-1/2 — Fortaleza BRA
1976 — Dobrzynski, Wojciech vs Gromek, Jozef — 0-1 — Vitrobud op Sandomierz
1990 — Schuldt, Volker vs Stanke, Juergen — 1/2-1/2 — Hamburg Schachfreunde
1991 — Pribyl, Josef vs Votava, Jan — 1-0 — Brno CZE
7.e4 — 2.5% (17 parties)
1966 — O'Kelly, Albéric de Galway vs Medina-Garcia, Antonio — 1-0 — Palma de Majorca ESP
1980 — Zaichik, Gennadi vs Sturua, Zurab — 0-1 — Tbilisi GEO
1990 — Bezold, Michael vs Berndt, Stephan — 1-0 — Neukoelln Berlin GER
1996 — Makarichev, Sergey vs Kobalia, Mikhail — 0-1 — Moscow RUS
1996 — Markowski, Tomasz vs Brito Garcia, Alfredo — 1/2-1/2 — Zaragoza

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