Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→g3, h2→g3	● f7→g6, h7→g6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e4 (2v0), ● b5 (2v0), ● d5 (3v0)	● b4 (2v0), ● d4 (2v0)
Cases faibles	—	—
Centre	● d5 (3v0), ● e4 (2v0)	● d4 (2v0), ● e5 (2v0)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bg2	● Bg2 Actif (mob. 6)
Bg7		● Bg7 Ok (mob. 3)
Bc8		● Bc8 Non développé (mob. 0)
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	● d2-d4, ● f2-f4	● …d7-d5

A25z — English: Closed, 5.Rb1

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

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plans. a3 (Préparer expansion aile dame — 74 % des parties) ; d3 (Solidifier le centre — 14 % des parties) ; e3 (Solidifier le centre — 8 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plans. ...d6 (Libérer Bc8 — 46 % des parties) ; ...Nf6 (Développer g8 — 22 % des parties) ; ...f5 (Attaque à l'aile roi — 22 % des parties) ; ...Nge7 (Développer g8 — 7 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Partie
1953 Bucharest – Round 15 – Szabo, Ladislav – 1-0 – Barda, Olaf – G140 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 d6 7. Nf3 Nge7 8. d3 h6 9. O-O O-O 10. b4 axb4
1959 Marianske Lazne – Round 10 – Gromek, Jozef – 1-0 – Blatny, Frantisek – G68 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Rb1 a5 6. a3 d6 7. b4 axb4 8. axb4 Bf5 9. d3 Qc8 10. Bd2 Nge7
1962 Vrnjacka Banja – Round 1 – Bertok, Mario Jr. – 1/2-1/2 – Bukic, Enver – G2 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. d3 Nge7 7. e3 d6 8. a3 Be6 9. Nd5 Qd7 10. Qa4 Bxd5
1963 CSR Ch – Round 8 – Ujtelky, Maximilian – 1-0 – Blatny, Frantisek – G74 1. g3 e5 2. Bg2 g6 3. c4 Nc6 4. Nc3 Bg7 5. Rb1 a5 6. a3 d6 7. d3 Bd7 8. Bd2 Nge7 9. b4 axb4 10. axb4 Qb8
1964 EU Team Ch sf – Round 3.3 – Barcza, Gedeon – 1/2-1/2 – Gheorghiu, Florin – G36 1. c4 g6 2. g3 Bg7 3. Bg2 e5 4. Nc3 Nc6 5. Rb1 a5 6. e3 Nge7 7. Nge2 d6 8. a3 Bd7 9. O-O Qc8 10. Nb5 h5
1964 IBM-B – Round 7 – Bertok, Mario Jr. – 1-0 – Kieninger, Georg – G17 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. e3 Nge7 7. Nge2 d6 8. d3 Be6 9. Nd5 O-O 10. O-O Bxd5
1964 Reggio Emilia ITA – Round 5 – Damele, Maurizio – 0-1 – Paoli, Enrico – G19 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. Nf3 Nge7 7. d3 O-O 8. O-O d6 9. Be3 Nd4 10. Qd2 Nef5
1964 Tel Aviv olm prel – Round 1 – Letelier Martner, Rene – 1/2-1/2 – Naranja, Renato – G4 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. e3 d6 7. Nge2 Nf6 8. O-O O-O 9. d3 Bf5 10. a3 Qd7
1967 Monte Carlo – Round 9 – Geller, Efim P – 1-0 – Mazzoni, Guido – G32 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Rb1 a5 6. a3 d6 7. b4 axb4 8. axb4 Nge7 9. d3 O-O 10. Nf3 Nd4
1968 Alma Ata ch-URS – Round 8 – Polugaevsky, Lev – 1-0 – Nikitin, A. – G76 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 f5 7. b4 axb4 8. axb4 Nf6 9. d3 O-O 10. b5 Nd4
1968 CSR Ch – Round 9 – Smejkal, Jan – 1-0 – Blatny, Frantisek – G74 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 d6 7. b4 axb4 8. axb4 Bf5 9. d3 Qc8 10. b5 Nce7
1968 Lugano ol (Men) fin-A – Round 11 – Szabo, Ladislav – 1/2-1/2 – Zinn, Lothar – G62 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 Nf6 7. b4 axb4 8. axb4 O-O 9. d3 Ne7 10. Nf3 d5
1968 Lugano olm - Round 1 - Huebner, Robert - 1/2-1/2 - Ungureanu, Elena-Alexandra - G15 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Rb1 a5 6. a3 d6 7. b4 axb4 8. axb4 Bf5 9. d3 Qd7 10. Nd5 Be6
1969 DSV-Turnier – Round 1 – Kovacs, Laszlo M – 0-1 – Zinn, Lothar – G2 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 f5 7. b4 axb4 8. axb4 d6 9. e3 e4 10. d4 exd3
1969 Palma de Mallorca – Round 3 – Panno, Oscar – 0-1 – Hort, Vlastimil – G30 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. e3 d6 7. Nge2 Be6 8. Nd5 Nce7 9. d4 c6 10. Nxe7 Nxe7
Amber-rapid 20th 2011 – Round 10 – Aronian, Levon – 1/2-1/2 – Topalov, Veselin – G27 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Rb1 a5 6. a3 f5 7. b4 axb4 8. axb4 e4 9. Nh3 Nge7 10. O-O O-O
Biel Interzonal 1993 – Round 12 – Korchnoi, Viktor – 0-1 – Anand, Viswanathan – G256 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Rb1 a5 6. d3 f5 7. a3 Nf6 8. Nf3 d6 9. Bg5 h6 10. Bxf6 Bxf6
EU Team Ch 1980 – Round 4 – Portisch, Lajos – 1/2-1/2 – Hort, Vlastimil – G9 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 d6 7. b4 axb4 8. axb4 f5 9. b5 Nce7 10. e3 Nf6
Interpolis 1989 – Round 12 – Korchnoi, Viktor – 1/2-1/2 – Piket, Jeroen – G41 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Rb1 a5 6. a3 d6 7. d3 Nf6 8. b4 axb4 9. axb4 O-O 10. b5 Ne7
Interpolis 1990 – Round 14 – Seirawan, Yasser – 1/2-1/2 – Kamsky, Gata – G42 1. c4 e5 2. g3 Nc6 3. Nc3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 f5 7. d3 Nf6 8. b4 axb4 9. axb4 O-O 10. b5 Ne7
Interpolis 1993 – Round 1 – Hodgson, Jeremy K – 1/2-1/2 – Jussupow, Artur – G5 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 Nf6 7. b4 axb4 8. axb4 O-O 9. d3 Ne7 10. Qb3 d6
Lindores Abbey Tal Memorial 2021 – Round 9.24 – Chigaev, Maksim – 0-1 – Ivic, Velimir – G398 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Rb1 a5 6. a3 Nge7 7. e3 d6 8. Nge2 h5 9. h3 h4 10. g4 f5
Malta ol (Men) 1980 – Round 11 – Portisch, Lajos – 1/2-1/2 – Hort, Vlastimil – G38 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 f5 7. d3 Nf6 8. e3 d6 9. Nge2 h5 10. h4 Qe7
Moskou ch-URS 1988 – Round 1 – Vaganian, Rafael A – 1/2-1/2 – Kharitonov, Adil – G2 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. a3 f5 7. d3 Nf6 8. Nf3 O-O 9. O-O d6 10. b4 axb4
Munich Express 1994 – Round ? – Lobron, Eric – 0-1 – Nikolic, Predrag – G4 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 a5 6. d3 f5 7. e3 Nf6 8. Nge2 O-O 9. O-O Ne7 10. f4 d6
World Blitz 2023 – Round 14.37 – Iturrizaga Bonelli, Eduardo – 1/2-1/2 – Chigaev, Maksim – G811 1. c4 g6 2. g3 Bg7 3. Bg2 e5 4. Nc3 Nc6 5. Rb1 a5 6. a3 h5 7. h3 d6 8. b4 axb4 9. axb4 Nge7 10. e3 O-O

A25z — Closed (1953)

1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Rb1 a5

Les coups candidats

6.a3 — 73.2% (776 parties)

Ambassadeurs : Rotstein, Arkadij (8x), Dvoirys, Semen I. (7x), Azmaiparashvili, Zurab (6x), Ivanchuk, Vasyl (6x), Willim, Michael (5x), Szabo, Laszlo (4x), Blatny, Frantisek (4x), Hort, Vlastimil (4x)

6.d3 — 15.8% (168 parties)

Ambassadeurs : Foisor, Ovidiu-Doru (6x), Sunye Neto, Jaime (4x), Gagunashvili, Merab (4x), Browne, Walter Shawn (3x), Zueger, Beat (2x), Kristiansen, Jens (2x), Savchenko, Stanislav (2x), Fradkin, Boris (2x)

6.e3 — 6.9% (73 parties)

Ambassadeurs : Larsen, Bent Ravn (2x), Haik, Aldo (2x), Lerner, Konstantin Z (2x), Browne, Walter Shawn (2x), Bertok, Mario Jr. (2x), Panno, Oscar (1x), Hort, Vlastimil (1x), Letelier Martner, Rene (1x)

6.Nf3 — 2.4% (25 parties)

Ambassadeurs : Georgiev, Vladimir (4x), Benjamin, Joel (2x), Damele, Maurizio (1x), Paoli, Enrico (1x), Kolvig, Bent (1x), Kamsky, Gata (1x), Ivanov, Igor V. (1x), OBrien, Erik Michael (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	6.a3	6.d3	6.e3	6.Nf3
<1800	22	82%	14%	—	—
1800-2200	219	75%	11%	6%	3%
2200-2600	649	72%	18%	7%	2%
2600+	44	73%	18%	7%	2%

Évolution par décennie (% des parties)

Décennie	N parties	6.a3	6.d3	6.e3	6.Nf3
1950s	3	100%	—	—	—
1960s	24	58%	21%	17%	4%
1970s	45	71%	11%	16%	—
1980s	126	81%	9%	6%	4%
1990s	311	72%	20%	5%	2%
2000s	266	70%	18%	8%	3%
2010s	215	73%	14%	7%	2%
2020s	70	81%	10%	7%	1%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
6.a3	73%	81%	▲ +7.9%
6.d3	14%	10%	▼ -4.4%
6.e3	7%	7%	▲ +0.6%
6.Nf3	2%	1%	▼ -0.9%

Joueurs célèbres

Champions du monde dans cette position

Kasparov, Garry — 3 parties
Karpov, Anatoly — 3 parties
Anand, Viswanathan — 1 partie

Parties historiques

6.a3 — 73.2% (776 parties)

1953 — Szabo, Laszlo vs Barda, Olaf — 1-0 — Bucharest ROU
1953 — Szabo, Laszlo vs Barda, George-Alexandru — 1-0 — Bucharest ROU
1959 — Gromek, Jozef vs Blatny, Frantisek — 1-0 — Marianske Lazne
1963 — Peterson, Andrejs vs Sakharov, Yuri N — 0-1 — Kiev UKR
1963 — Ujtelky, Maximilian vs Blatny, Frantisek — 1-0 — Prague CZE

6.d3 — 15.8% (168 parties)

1962 — Bertok, Mario Jr. vs Bukic, Enver — 1/2-1/2 — Vrnjacka Banja SRB
1965 — Anay Barche vs Gunsberger, Alexander — 1-0 — Hamburg etc
1968 — Vasiukov, Evgeni vs Makarov, Ilya — 1/2-1/2 — ?
1968 — Lazos, James vs Blackstone, John — 1-0 — Santa Monica, CA USA
1969 — Plante, Jacques vs Mazzoni, Guy — 1/2-1/2 — Pau

6.e3 — 6.9% (73 parties)

1964 — Letelier Martner, Rene vs Naranja, Renato — 1/2-1/2 — Tel Aviv olm prel
1964 — Bertok, Mario Jr. vs Kieninger, Georg — 1-0 — Amsterdam NED
1964 — Anay Barche vs Gheorghiu, Florin — 1/2-1/2 — Sinaia
1969 — Panno, Oscar vs Hort, Vlastimil — 0-1 — Palma de Majorca ESP
1970 — O'Kelly, Albéric de Galway vs Rapaka Samuel Paul — 1/2-1/2 — Buenos Aires ARG

6.Nf3 — 2.4% (25 parties)

1964 — Damele, Maurizio vs Paoli, Enrico — 0-1 — Reggio Emilia ITA
1986 — Haas, Adrian vs Rada, Hannes — 1/2-1/2 — A-483,1986-87
1988 — Boudy, Althea vs Rivera, Daniel — 0-1 — Cardenas
1989 — Kolvig, Bent vs Kamsky, Gata — 1/2-1/2 — It (open) Philadelphia (USA)
1989 — Ivanov, Igor V. vs OBrien, Erik Michael — 1-0 — Berkeley

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