A37o — English: Symmetrical, 5.Nf3 e6 6.O-O Nge7 7.d3 O-O

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 e6 6.O-O Nge7 7.d3 O-O * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Atouts. Les Blancs s'appuient sur les cases fortes e4, f4, b5 et g5, un avant-poste en e4 et la paire de fous.

Côté adverse. Le fou enfermé en c8.

En contrepartie. Plusieurs pièces dorment encore (le fou c1 et la tour a1).

Plans. Be3 (Développer Bc1) ; h3 (Empêcher ...Bg4).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Atouts. Les Noirs s'appuient sur les cases fortes b4, d4, e5 et f5, un avant-poste en d4, un fou actif en g7 et la paire de fous.

Côté adverse. Les fous enfermés en c1 et g2.

En contrepartie. Plusieurs pièces dorment encore (le fou c8 et la tour a8).

Plans. ...d6 (Libérer Bc8) ; ...Bg4 (Clouer Nf3) ; ...d5 (Rupture) ; ...e5 (Rupture) ; ...f6 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● e2→d3, f2→g3, h2→g3, d3→c4	● d7→e6, f7→e6, f7→g6, h7→g6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e4 (2v0), ● f4 (2v0), ● b5 (2v0), ● g5 (2v0)	● b4 (2v0), ● d4 (3v1), ● e5 (2v1), ● f5 (3v0)
Cases faibles	—	—
Centre	● e4 (2v0)	● d4 (3v1), ● e5 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bg2	● Bg2 Enfermé (mob. 2)
Bg7		● Bg7 Actif (mob. 6)
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, ● …e6-e5, ● …f7-f6, ● …f7-f5

Partie
1956 URS Ch, semi final – Round 1 – Koblencs, Alexander – 1/2-1/2 – Korchnoi, Viktor – G4 1. c4 c5 2. Nc3 g6 3. Nf3 Bg7 4. g3 Nc6 5. Bg2 e6 6. O-O Nge7 7. d3 O-O 8. Bf4 d6 9. Qc1 e5 10. Bd2 Rb8
1957 Wageningen zt – Round 15 – Kolarov, Atanas S. – 0-1 – Donner, Jan-Hein – G45 1. Nf3 c5 2. c4 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nc3 e6 6. O-O Nge7 7. d3 O-O 8. Bg5 h6 9. Bd2 a6 10. Qc1 Kh7
1958 WchT U26 prel-B 05th – Round 3 – Lombardy, William J – 1/2-1/2 – Bobotsov, Milko G – G11 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 e6 6. O-O Nge7 7. d3 O-O 8. Bf4 e5 9. Bd2 d6 10. Rb1 Rb8
1958 YUG Ch 13th – Round 19 – Cuderman, Vinko – 1/2-1/2 – Trifunovic, Petar – G106 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. O-O Nc6 5. c4 e6 6. Nc3 Nge7 7. d3 O-O 8. Bf4 d6 9. Qc1 Nf5 10. Rb1 b6
1960 HUN Ch playoff – Round 12 – Barcza, Gedeon – 1/2-1/2 – Portisch, Lajos – G11 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. d3 e6 6. c4 Nge7 7. Nc3 O-O 8. a3 b6 9. Rb1 Bb7 10. Bd2 d6
1962 Budapest-Warsaw m – Round ? – Gawlikowski, Stanislaw – 1/2-1/2 – Forintos, Gyozo V – G38 1. Nf3 g6 2. c4 Bg7 3. Nc3 c5 4. g3 Nc6 5. Bg2 e6 6. O-O Nge7 7. d3 O-O 8. Bg5 h6 9. Bd2 d5 10. cxd5 exd5
1963 Budapest ch-HUN – Round 1 – Sapi, Laszlo – 0-1 – Forintos, Gyozo V – G176 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. O-O Nc6 5. c4 e6 6. Nc3 Nge7 7. d3 O-O 8. Bf4 d6 9. Qc1 Nf5 10. e4 Nfd4
1963 JUG-URS – Round 1 – Udovcic, Mijo – 1/2-1/2 – Averbakh, Yuri L – G18 1. Nf3 g6 2. g3 Bg7 3. Bg2 c5 4. O-O Nc6 5. c4 e6 6. Nc3 Nge7 7. d3 O-O 8. Bf4 d6 9. Qd2 Nf5 10. g4 Nfd4
1965 Hungary – Round 1 – Forintos, Gyozo V – 1/2-1/2 – Liptay, Laszlo Dr. – G102 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. c4 Nc6 5. Nc3 e6 6. d3 Nge7 7. O-O O-O 8. Bf4 d5 9. cxd5 Nxd5 10. Nxd5 exd5
1965 Novi Sad – Round 1 – Ilievski, Dimitar – 0-1 – Matulovic, Milan – G22 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 e6 6. Nc3 Nge7 7. d3 O-O 8. Bf4 d5 9. cxd5 Nxd5 10. Nxd5 exd5
1966 New York ch-USA – Round 10 – Byrne, David – 1-0 – Byrne, Ray – G53 1. g3 g6 2. Bg2 Bg7 3. c4 c5 4. Nc3 Nc6 5. d3 e6 6. Nf3 Nge7 7. O-O O-O 8. Bf4 d6 9. Qc1 b6 10. Rb1 Bb7
1966 Tbilisi ch-URS – Round 8 – Stein, Leon Rico – 1/2-1/2 – Nikolaevsky, Yuri V – G78 1. Nf3 g6 2. g3 c5 3. Bg2 Bg7 4. O-O Nc6 5. c4 e6 6. Nc3 Nge7 7. d3 O-O 8. Bf4 d6 9. Rb1 h6 10. a3 a5
1967 CSR Ch – Round 7 – Kupka, Slavoj – 0-1 – Smejkal, Jan – G48 1. Nf3 g6 2. c4 c5 3. Nc3 Nc6 4. g3 Bg7 5. Bg2 e6 6. O-O Nge7 7. d3 O-O 8. Bg5 h6 9. Bd2 d5 10. cxd5 exd5
1967 Sarajevo – Round 15 – Mestrovic, Zvonimir – 1/2-1/2 – Bogdanovic, Radivoje – G81 1. c4 c5 2. Nf3 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2 e6 6. O-O Nge7 7. d3 O-O 8. Bg5 h6 9. Bd2 Kh7 10. a3 a6
1967 URS Team Ch – Round 1 – Roizman, Abram Y – 0-1 – Nikolaevsky, Yuri V – G3 1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nf3 e6 6. O-O Nge7 7. d3 O-O 8. a3 d5 9. Bd2 h6 10. cxd5 exd5
1968 Hoogovens – Round 6 – Korchnoi, Viktor – 1-0 – Karaklajic, Nikola – G62 1. g3 c5 2. Bg2 Nc6 3. Nf3 g6 4. O-O Bg7 5. c4 e6 6. Nc3 Nge7 7. d3 O-O 8. Bg5 h6 9. Bd2 b6 10. a3 Bb7
1968 Kislovodsk – Round 1 – Bronstein, David I – 1/2-1/2 – Honfi, K. – G2 1. c4 g6 2. Nc3 c5 3. g3 Bg7 4. Bg2 e6 5. d3 Ne7 6. Nf3 Nbc6 7. O-O O-O 8. Bf4 d5 9. Qc1 d4 10. Ne4 e5
1968 Vinkovci – Round 13 – Byrne, David – 0-1 – Matulovic, Milan – G76 1. g3 c5 2. Bg2 Nc6 3. c4 g6 4. Nc3 Bg7 5. d3 e6 6. Nf3 Nge7 7. O-O O-O 8. Bf4 d5 9. cxd5 Nxd5 10. Nxd5 exd5
1968 WchT U26 – Round 1 – Van den Berg, Carel B – 0-1 – Smejkal, Jakub – G4 1. c4 g6 2. Nc3 c5 3. g3 Bg7 4. Bg2 Nc6 5. Nf3 e6 6. O-O Nge7 7. d3 O-O 8. Bf4 d5 9. Qc1 b6 10. Bh6 d4
1969 Budapest ch-HUN – Round 1 – Cs. Kovacs, Laszlo – 1-0 – Polgar, Istvan – G14 1. c4 g6 2. Nc3 c5 3. g3 Bg7 4. Bg2 Nc6 5. Nf3 e6 6. O-O Nge7 7. d3 O-O 8. Bg5 d6 9. Qc1 a6 10. Rd1 Rb8
1969 Tallinn it – Round 13 – Book, Eero – 1/2-1/2 – Gipslis, Aivars – G53 1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. d3 e6 6. Nf3 Nge7 7. O-O O-O 8. Rb1 d5 9. Bd2 b6 10. a3 a5
36. Olympiad 2004 – Round 6 – Moiseenko, Alexander – 0-1 – Gashimov, Vugar – G217 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 e6 6. Nc3 Nge7 7. d3 O-O 8. Be3 d6 9. Qc1 Nf5 10. Bg5 Qb6
Buenos Aires 1980 – Round 1 – Larsen, Bent – 1/2-1/2 – Karpov, Anatoly – G1 1. c4 c5 2. g3 g6 3. Bg2 Bg7 4. Nf3 Nc6 5. O-O e6 6. Nc3 Nge7 7. d3 O-O 8. a3 d5 9. Bg5 h6 10. cxd5 exd5
GCT Blitz Paris 2019 – Round 4.2 – Dubov, Daniil – 1/2-1/2 – Duda, Jacob – G17 1. c4 c5 2. Nf3 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nc3 e6 6. O-O Nge7 7. d3 O-O 8. Rb1 d5 9. Bg5 h6 10. Bd2 b6
Interpolis 1982 – Round 1 – Larsen, Bent – 0-1 – Portisch, Lajos – G2 1. c4 c5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Nf3 e6 6. O-O Nge7 7. d3 O-O 8. Rb1 b6 9. Bf4 d5 10. cxd5 exd5
World Blitz 2016 – Round 5.38 – Agdestein, Simen – 1/2-1/2 – Volokitin, Andrei – G206 1. c4 g6 2. Nc3 c5 3. g3 Bg7 4. Bg2 Nc6 5. Nf3 e6 6. O-O Nge7 7. d3 O-O 8. a3 d5 9. Bd2 b6 10. Rb1 d4
World Blitz 2019 – Round 20.15 – Dubov, Daniil – 0-1 – Cheparinov, Ivan – G1331 1. c4 c5 2. Nf3 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2 e6 6. O-O Nge7 7. d3 O-O 8. Bg5 h6 9. Bd2 d5 10. Qc1 Kh7

A37o — Symmetrical

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 e6 6.O-O Nge7 7.d3 O-O

Eval: [-0.22]

Les coups candidats

8.Bd2 — 32.5% (728 parties) →

Ambassadeurs : Morihama, Nicolau (7x), Koehler, Josef (7x), Gheorghiu, Florin (6x), Urpilainen, Erkki (5x), Keene, Raymond D (4x), Moehring, Guenther (4x), Golcman, Evgeny (4x), Lomsadze, Davit (4x)

8.Bg5 — 18.0% (403 parties)

Ambassadeurs : Gereben, Erno (3x), Dizdar, Goran (3x), Hillebrand, Carsten (3x), Drasko, Milan (3x), Held, Carsten, Dr. (3x), Mednis, Edmar J (2x), Alterman, Boris (2x), Suri, Alberto (2x)

8.Bf4 — 15.6% (350 parties)

Ambassadeurs : Larsen, Benjamin Holsko (4x), Browne, Walter Shawn (3x), Gausel, Einar J (3x), Bobotsov, Milko G (2x), Byrne, David (2x), Matulovic, Milan (2x), Forintos, Gyozo V (2x), Tatai, Stefano (2x)

8.Rb1 — 9.7% (217 parties)

Ambassadeurs : Heck, Norbert (3x), Smejkal, Jan (2x), Larsen, Benjamin Holsko (2x), Bjarnason, Saevar (2x), Cvitan, Ognjen (2x), Book, Eero (1x), Gipslis, Aivars (1x), Geotgelvek, G (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	8.Bd2	8.Bg5	8.Bf4	8.Rb1
<1800	58	16%	12%	14%	16%
1800-2200	765	28%	20%	15%	10%
2200-2600	1009	35%	19%	15%	9%
2600+	26	42%	27%	4%	8%

Évolution par décennie (% des parties)

Décennie	N parties	8.Bd2	8.Bg5	8.Bf4	8.Rb1
1950s	10	40%	10%	40%	—
1960s	64	58%	11%	17%	6%
1970s	132	50%	7%	20%	8%
1980s	141	33%	13%	18%	11%
1990s	395	31%	17%	14%	12%
2000s	509	30%	15%	18%	11%
2010s	876	31%	23%	13%	8%
2020s	114	24%	18%	20%	11%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
8.Bd2	31%	24%	▼ -7.5%
8.Bg5	23%	18%	▼ -5.6%
8.Bf4	13%	20%	▲ +7.2%
8.Rb1	8%	11%	▲ +3.4%

Joueurs célèbres

Champions du monde dans cette position

Tal, Mikhail — 3 parties
Smyslov, Vladimir — 1 partie
Karpov, Anatoly — 1 partie
Karpov, Aleksandr — 1 partie
Carlsen, Magnus — 1 partie
Anand, Viswanathan — 1 partie

Parties historiques

8.Bd2 — 32.5% (728 parties)

1957 — Uhlmann, Wolfgang vs Trifunovic, Petar — 1/2-1/2 — Wageningen NED
1957 — Kholmov, Ratmir D vs Korchnoi, Viktor — 1/2-1/2 — Sverdlovsk
1958 — Kozma, Julius vs Forintos, Gyozo V — 1/2-1/2 — Varna BUL
1959 — Orendy, Emil vs Forintos, Gyozo V — 1-0 — HUN-ch Budapest HUN
1960 — Bilek, Istvan vs Mst Raisa, Rahman — 1-0 — Budapest HUN

8.Bg5 — 18.0% (403 parties)

1957 — Kolarov, Atanas S. vs Donner, Jan-Hein — 0-1 — Wageningen NED
1962 — Gawlikowski, Stanislaw vs Forintos, Gyozo V — 1/2-1/2 — Budapest HUN
1965 — Acosta Cuellar, Juan Martin vs Gandarias Geller, Marcos — 0-1 — Santiago de Chile
1967 — Mestrovic, Zvonimir vs Bogdanovic, Radivoje — 1/2-1/2 — Sarajevo BIH
1967 — Krasznovszky, Sandor vs Szekely, Sandor — 1-0 — Hungary CCC-8

8.Bf4 — 15.6% (350 parties)

1956 — Koblencs, Alexander vs Korchnoi, Viktor — 1/2-1/2 — Tbilisi GEO
1958 — Lombardy, William J vs Bobotsov, Milko G — 1/2-1/2 — Varna BUL
1958 — Raizman, Maurice vs Bobotsov, Milko G — 0-1 — Munich GER
1958 — Cuderman, Vinko vs Trifunovic, Petar — 1/2-1/2 — Sarajevo BIH
1963 — Kirilov, Valentins vs Solmanis, Zigfrids — 1/2-1/2 — Riga LAT

8.Rb1 — 9.7% (217 parties)

1962 — Barcza, Gedeon vs Suetin, Alexey S — 1/2-1/2 — Minsk BLR
1967 — Geotgelvek, G vs Kubicek, Adam — 0-1 — Harrachov
1967 — Klibor, Lutz vs Smejkal, Jan — 0-1 — Buesum
1969 — Book, Eero vs Gipslis, Aivars — 1/2-1/2 — Tallinn EST
1970 — Kreckler, Warren vs De Fotis, Gregory — 0-1 — Chicago, IL USA

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