A38l — English: Symmetrical, Main Line, 7.d3 a6

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d3 a6 * ○ 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 f4, case forte d5, case forte g5, paire de fous.
Faiblesses adverses : arriéré b7, 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, avant-poste d4(C), paire de fous.
Faiblesses adverses : Bc1 enfermé, Bg2 enfermé.
Problèmes : Bg7 enfermé, Bc8 enfermé, arriéré b7.
Plans :
● ...d6 — Libérer Bc8
● ...Bg4 — Clouer Nf3
● ...d5 — Rupture
● ...e6 — Rupture
● ...e5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

A38l —

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d3 a6

Eval: [+0.25]

Les coups candidats

8.a3 — 28.5% (107 parties)

Ambassadeurs : Sadvakasov, Darmen (2x), Avrukh, Boris (2x), Janetschek, Karl (2x), Dietze, Wolfgang, Dr. (1x), Schoeneberg, Manfred (1x), Toran Albero, Roman (1x), Rodriguez Gonzales, Jesus (1x), Portisch, Lajos (1x)

8.Rb1 — 20.3% (76 parties)

Ambassadeurs : Ree, Hans (2x), Muratov, Vladimir A (1x), Yurkov, Vladimir (1x), Rantanen, Matti (1x), Wheeler, John F (1x), Khodos, German (1x), Barcza, Gedeon (1x), Matanovic, Aleksandar (1x)

8.Bd2 — 11.2% (42 parties)

Ambassadeurs : Zivkovic, Vesna (1x), Dengler, Dijana (1x), Barlov, Dragan (1x), Simic, Radoslav K (1x), Palatkova, Eliska (1x), Modrova, Hana (1x), Gouret, Thierry (1x), Birmingham, Eric (1x)

8.Be3 — 9.9% (37 parties)

Ambassadeurs : Schacher, Gerd (2x), Smyslov, Vladimir (1x), Timman, Jan H (1x), Janata, Michael (1x), Ostermeyer, Peter, Dr. (1x), Zoltek, Tadeusz (1x), Balcerowski, Witold (1x), Kotov, Alexander (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	8.a3	8.Rb1	8.Bd2	8.Be3
<1800	24	46%	25%	8%	12%
1800-2200	148	22%	23%	14%	6%
2200-2600	107	36%	13%	12%	12%
2600+	6	—	17%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	8.a3	8.Rb1	8.Bd2	8.Be3
1950s	3	—	—	—	67%
1960s	20	20%	30%	—	15%
1970s	8	25%	12%	—	12%
1980s	7	14%	14%	29%	43%
1990s	79	39%	19%	9%	6%
2000s	108	23%	20%	18%	12%
2010s	135	28%	21%	10%	7%
2020s	15	40%	20%	—	7%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
8.a3	28%	40%	▲ +11.9%
8.Rb1	21%	20%	▼ -0.7%
8.Bd2	10%	0%	▼ -10.4%
8.Be3	7%	7%	+0.0%

Joueurs célèbres

Champions du monde dans cette position

Tal, Mikhail — 3 parties
Smyslov, Vladimir — 1 partie

Parties historiques

8.a3 — 28.5% (107 parties)

1960 — Toran Albero, Roman vs Rodriguez Gonzales, Jesus — 1/2-1/2 — Leipzig GER
1965 — Portisch, Lajos vs Tal, Mikhail — 1/2-1/2 — Bled YUG
1968 — Koolmeister vs Lipman, Vladimir — 0-1 — Riga LAT
1969 — Dietze, Wolfgang, Dr. vs Schoeneberg, Manfred — 0-1 — Schwerin GER
1974 — Schwab, Francisco Carlos Coelho vs Reis, Cesar Roberto Da Silva — 1/2-1/2 — Rio de Janeiro BRA

8.Rb1 — 20.3% (76 parties)

1960 — Lloyd, Kenneth W vs Forintos, Gyozo V — 1/2-1/2 — Leningrad RUS
1961 — Barcza, Gedeon vs Matanovic, Aleksandar — 1/2-1/2 — Oberhausen etc
1962 — Wheeler, John F vs Khodos, German — 0-1 — Marianske Lazne
1965 — Goethals F vs Ree, Hans — 1/2-1/2 — Sinaia
1966 — Rantanen, Matti vs Ree, Hans — 1/2-1/2 — Havana CUB

8.Bd2 — 11.2% (42 parties)

1984 — Barlov, Dragan vs Simic, Radoslav K — 1/2-1/2 — Val Thorens FRA
1989 — Zivkovic, Vesna vs Dengler, Dijana — 1-0 — Zlatibor
1990 — Gouret, Thierry vs Birmingham, Eric — 0-1 — Paris FRA
1992 — Palatkova, Eliska vs Modrova, Hana — 1/2-1/2 — Prague Bohemians-W
1993 — Ticha, H vs Krsek, Tomas — 1-0 — Pardubice CZE

8.Be3 — 9.9% (37 parties)

1957 — Saigin, Vladimir vs Suetin, Alexey S — 0-1 — Minsk BLR
1958 — Kotov, Alexander vs Gurgenidze, V — 1/2-1/2 — Riga ch-URS
1963 — Janata, Michael vs Ostermeyer, Peter, Dr. — 1/2-1/2 — Vrnjacka Banja SRB
1966 — Zoltek, Tadeusz vs Balcerowski, Witold — 0-1 — Rzeszow ch POL
1969 — Smyslov, Vladimir vs Timman, Jan H — 1/2-1/2 — Hastings ENG

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	● b7
Chaînes	● e2→d3, f2→g3, h2→g3, d3→c4	● b7→a6, f7→g6, h7→g6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e4 (2v1), ● f4 (2v0), ● d5 (2v1), ● g5 (2v0)	● b4 (2v0), ● d4 (2v1)
Cases faibles	—	—
Centre	● d5 (2v1), ● e4 (2v1)	● d4 (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. 0)
Paire de fous	● Oui	● Oui
Non développées	2 (c1, a1)	2 (c8, a8)

Sécurité du roi

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

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	semi-ouvert
Ruptures	● d3-d4, ● e2-e3	● …d7-d6, ● …d7-d5, ● …e7-e6, ● …e7-e5

Partie
1958 Riga ch-URS – Round 1 – Kotov, Alexander A – 1/2-1/2 – Gurgenidze, V – G15 1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 c5 6. d3 Nc6 7. O-O a6 8. Be3 d6 9. h3 Bd7 10. Qd2 Rb8
1959 Marianske Lazne – Round 11 – Ujtelky, Maximilian – 0-1 – Szabo, Laszlo – G75 1. c4 c5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d3 a6 8. Bg5 h6 9. Be3 d6 10. h3 e5
1961 Oberhausen etc – Round 1 – Barcza, Gedeon – 1/2-1/2 – Matanovic, Aleksandar – G54 1. Nf3 g6 2. c4 Bg7 3. Nc3 Nf6 4. g3 O-O 5. Bg2 c5 6. O-O Nc6 7. d3 a6 8. Rb1 Rb8 9. a3 b5 10. cxb5 axb5
1963 Halle zt – Round 1 – Portisch, Lajos – 1-0 – Doda, Zbigniew – G122 1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O c5 6. Nc3 Nc6 7. d3 a6 8. d4 cxd4 9. Nxd4 Ng4 10. Nb3 Nge5
1964 Reggio Emilia ITA – Round 5 – Bilek, Istvan – 1/2-1/2 – Bertok, Mario Jr. – G22 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 Nf6 6. Nc3 O-O 7. d3 a6 8. Bf4 d6 9. Qc1 Rb8 10. Bh6 b5
1966 La Habana ol (Men) fin-B – Round 1 – Rantanen, Matti – 1/2-1/2 – Ree, Hans – G1 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. O-O Nc6 5. d3 Nf6 6. c4 O-O 7. Nc3 a6 8. Rb1 Rb8 9. a4 d6 10. Bd2 Bd7
1966 Rzeszow ch POL – Round 12 – Zoltek, Tadeusz – 0-1 – Balcerowski, Witold – G79 1. c4 Nf6 2. Nc3 c5 3. g3 Nc6 4. Bg2 g6 5. Nf3 Bg7 6. O-O O-O 7. d3 a6 8. Be3 d6 9. h3 Rb8 10. Rc1 b5
1969 Hastings6970 – Round 8 – Smyslov, Vladimir – 1/2-1/2 – Timman, Jan H – G35 1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nf3 Nf6 6. O-O O-O 7. d3 a6 8. Be3 d6 9. h3 Bd7 10. Qd2 Rb8
1969 Schwerin – Round 9 – Dietze, Wolfgang, Dr. – 0-1 – Schoeneberg, Manfred – G68 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nf6 6. d3 O-O 7. O-O a6 8. a3 Rb8 9. Rb1 b5 10. cxb5 axb5
Interpolis 1978 – Round 8 – Larsen, Bent – 0-1 – Huebner, Robert – G27 1. c4 Nf6 2. Nf3 c5 3. Nc3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d3 a6 8. Bf4 d6 9. Qd2 Rb8 10. Bh6 b5