A37b — English: Symmetrical, 5.Nf3 a6

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 a6 * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte d5, paire de fous.
Faiblesses adverses : arriéré b7, Bc8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, Bg2 enfermé, 3 pièces non développées (C1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● d3 — Libérer Bc1
● 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 e5, Bg7 actif, paire de fous.
Faiblesses adverses : Bc1 enfermé, Bg2 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, arriéré b7, 4 pièces non développées (G8, C8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...d6 — Libérer Bc8
● ...Nf6 — Développer Ng8
● ...Bg4 — Clouer Nf3
● ...d5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

A37b —

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 a6

Eval: [+0.26]

Les coups candidats

6.O-O — 70.8% (267 parties)

Ambassadeurs : Rantanen, Yrjo A. (8x), Benko, Pal (5x), Evans, Larry (3x), Osthof, Alfred, Prof. Dr. (3x), Malich, Burkhard, Dr. (2x), Kupper, Josef (2x), Kiffmeyer, Constanz (2x), Barcza, Gedeon (2x)

6.a3 — 13.0% (49 parties)

Ambassadeurs : Hoensch, Matthias (3x), Barcza, Gedeon (2x), Reshevsky, Samuel (2x), Krebs, Johann (2x), Ballmann, Martin (2x), Schmidt, Waldemar (1x), Blumenfeld Fernandez, Ilan (1x), Blumenfeld, Rudy (1x)

6.d3 — 6.9% (26 parties)

Ambassadeurs : De Bruycker, Bernard (3x), Pira, Davoud (3x), Benoit, Michel (2x), Stoliar, Efim Samoilovich (1x), Shmit, Anatoly (1x), Fuller, Roberto Antonio (1x), Penrose, Justin (1x), Arnaudov, Petar (1x)

6.e3 — 3.2% (12 parties)

Ambassadeurs : Lukic, Arsenije (1x), Bertok, Mario Jr. (1x), Dobosz, Henryk (1x), Schmidt, Wlodzimierz (1x), Gerusel, Mathias (1x), Kiffmeyer, Constanz (1x), Vigus, James E (1x), Beaumont, Chris R (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	6.O-O	6.a3	6.d3	6.e3
<1800	3	33%	33%	—	33%
1800-2200	95	78%	8%	3%	3%
2200-2600	187	68%	16%	8%	3%
2600+	2	100%	—	—	—

Évolution par décennie (% des parties)

Décennie	N parties	6.O-O	6.a3	6.d3	6.e3
1920s	1	100%	—	—	—
1950s	9	33%	33%	—	11%
1960s	45	73%	9%	11%	—
1970s	23	57%	22%	9%	9%
1980s	25	80%	8%	4%	—
1990s	79	65%	16%	9%	4%
2000s	95	76%	11%	8%	2%
2010s	93	74%	12%	3%	4%
2020s	7	71%	14%	—	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
6.O-O	74%	71%	▼ -2.8%
6.a3	12%	14%	▲ +2.5%
6.d3	3%	0%	▼ -3.2%
6.e3	4%	0%	▼ -4.3%

Joueurs célèbres

Champions du monde dans cette position

Euwe, Max — 1 partie
Gukesh D — 1 partie

Parties historiques

6.O-O — 70.8% (267 parties)

1927 — Takacs, Sandor vs Beutum, Sigmund — 1-0 — Vienna AUT
1957 — Papp, Laszlo vs Barcza, Gedeon — 0-1 — Budapest HUN
1958 — Euwe, Max vs Szabo, Ladislav — 0-1 — Munchen olm
1958 — Reshevsky, Samuel vs Kupper, Josef — 1/2-1/2 — Munich GER
1960 — Radulescu, Mihai vs Soos, Bela — 0-1 — Bucharest ROU

6.a3 — 13.0% (49 parties)

1958 — Blumenfeld Fernandez, Ilan vs Reshevsky, Samuel — 0-1 — Nuerenberg GER
1958 — Blumenfeld, Rudy vs Reshevsky, Samuel — 0-1 — Haifa/Tel Aviv
1958 — Portisch, Lajos vs Szabo, Ladislav — 1/2-1/2 — Balatonfured
1965 — Barcza, Gedeon vs O'Kelly, Albéric de Galway — 1/2-1/2 — corr Ragosin
1968 — Barcza, Gedeon vs Schmidt, Waldemar — 1/2-1/2 — Lugano SUI

6.d3 — 6.9% (26 parties)

1962 — Fuller, Roberto Antonio vs Penrose, Justin — 1/2-1/2 — Whitby ch-BCF
1963 — Addison, Wiliam G vs Evans, Larry — 0-1 — New York ch-USA
1964 — Stoliar, Efim Samoilovich vs Shmit, Anatoly — 1/2-1/2 — Riga LAT
1965 — Arnaudov, Petar vs Kapengut, Albert — 0-1 — Sinaia stud ol prel
1968 — Dresen, Ulrich vs Kiffmeyer, Constanz — 0-1 — Saarbruecken

6.e3 — 3.2% (12 parties)

1959 — Lukic, Arsenije vs Bertok, Mario Jr. — 1-0 — JUG-ch Kragujevac YUG
1970 — Gerusel, Mathias vs Kiffmeyer, Constanz — 0-1 — Bad Pyrmont GER
1977 — Dobosz, Henryk vs Schmidt, Wlodzimierz — 0-1 — Piotrkow Trybunalski
1995 — Enzendorfer, Alfred vs Krebs, Johann — 1-0 — Austria Tch 9495
1998 — Vigus, James E vs Beaumont, Chris R — 1-0 — Warwick ENG

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

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d5 (2v0)	● b4 (2v0), ● d4 (3v1), ● e5 (2v1)
Cases faibles	—	—
Centre	● d5 (2v0), ● e4 (1v0)	● d4 (3v1), ● e5 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bg2	● Bg2 Enfermé (mob. 2)
Bg7		● Bg7 Actif (mob. 6)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	3 (c1, a1, 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 / O-O-O

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	semi-ouvert
Ruptures	● d2-d3, ● e2-e3	● …d7-d6, ● …d7-d5, ● …e7-e6, ● …e7-e5, ● …f7-f6, ● …f7-f5

Partie
1927 Trebitsch Memorial 11th – Round 5 – Takacs, Sandor – 1-0 – Beutum, Sigmund – G10 1. c4 c5 2. Nf3 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2 a6 6. O-O e6 7. e3 Nf6 8. d4 d6 9. e4 cxd4 10. Nxd4 O-O
1957 HUN Ch 12th – Round ? – Papp, Laszlo – 0-1 – Barcza, Gedeon – G19 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. c4 Bg7 5. Nc3 a6 6. O-O Rb8 7. e3 d6 8. d4 cxd4 9. exd4 Bg4 10. Be3 Nh6
1958 Asztalos Memorial – Round 1 – Portisch, Lajos – 1/2-1/2 – Szabo, Ladislav – G2 1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nc3 a6 6. a3 Rb8 7. Rb1 b5 8. cxb5 axb5 9. b4 cxb4 10. axb4 Nh6
1958 Asztalos Memorial – Round 9 – Forintos, Gyozo V – 0-1 – Malich, Burkhard, Dr. – G27 1. Nf3 c5 2. g3 Nc6 3. c4 g6 4. Bg2 Bg7 5. Nc3 a6 6. h4 Nf6 7. d3 d6 8. Bd2 Bd7 9. Qc1 h5 10. Rb1 Rb8
1958 Haifa/Tel Aviv – Round 7 – Blumenfeld, Rudy – 0-1 – Reshevsky, Samuel – G38 1. c4 g6 2. g3 Bg7 3. Bg2 c5 4. Nf3 Nc6 5. Nc3 a6 6. a3 Rb8 7. Rb1 d6 8. e4 Nf6 9. O-O O-O 10. b4 Bg4
1958 HUN Ch – Round 5 – Portisch, Lajos – 1-0 – Barczay, Laszlo – G4 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. c4 Nc6 5. Nc3 a6 6. Rb1 Rb8 7. a3 b5 8. cxb5 axb5 9. b4 cxb4 10. axb4 Nf6
1958 Munich olm fin-A – Round 10 – Reshevsky, Samuel – 1/2-1/2 – Kupper, Josef – G101 1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nc3 a6 6. O-O d6 7. a3 Rb8 8. Rb1 b5 9. cxb5 axb5 10. b4 cxb4
1958 Munich olm fin-B – Round 7 – Euwe, Max – 0-1 – Szabo, Ladislav – G28 1. c4 c5 2. g3 Nc6 3. Bg2 g6 4. Nf3 Bg7 5. Nc3 a6 6. O-O Rb8 7. a4 e5 8. d3 d6 9. Ne1 Nge7 10. f4 O-O
1959 JUG Ch Kragujevac YUG – Round 1 – Lukic, Arsenije – 1-0 – Bertok, Mario Jr. – G1 1. c4 g6 2. Nc3 Bg7 3. g3 c5 4. Bg2 Nc6 5. Nf3 a6 6. e3 d6 7. d4 Bg4 8. h3 Bxf3 9. Bxf3 Nf6 10. d5 Na5
1960 Bariloche – Round 8 – Esposito, Alfredo – 1/2-1/2 – Sanguineti, Raúl Carlos – G31 1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nf3 a6 6. O-O Rb8 7. a4 e5 8. d3 Nge7 9. Ne1 d6 10. Nc2 O-O
1960 WchT U26 07th – Round 6 – Soderborg, Berndt – 0-1 – Drimer, Dolfi – G13 1. c4 c5 2. Nf3 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2 a6 6. O-O Nh6 7. d3 Nf5 8. Rb1 O-O 9. a3 Rb8 10. Ne4 d6
1961 Moskou – Round 1 – Cherepkov, Alexander V – 1/2-1/2 – Taimanov, Mark E – G1 1. c4 c5 2. Nc3 g6 3. Nf3 Bg7 4. g3 Nc6 5. Bg2 a6 6. O-O Rb8 7. a4 e5 8. d3 Nge7 9. Bg5 O-O 10. Qc1 d6
1962 Stockholm Interzonal – Round 23 – Barcza, Gedeon – 1/2-1/2 – Benko, Pal – G208 1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nc3 a6 6. O-O Nh6 7. Rb1 Nf5 8. Ne1 O-O 9. Nd3 d6 10. b3 Bd7
1962 Whitby ch-BCF – Round 3 – Fuller, Roberto Antonio – 1/2-1/2 – Penrose, Justin – G46 1. Nf3 c5 2. g3 Nc6 3. c4 g6 4. Bg2 Bg7 5. Nc3 a6 6. d3 Rb8 7. O-O d6 8. Ne1 Bd7 9. Bd2 b5 10. Rb1 Nh6
1963 Bad Liebenstein – Round 5 – Polugaevsky, Lev – 1/2-1/2 – Malich, Burkhard, Dr. – G28 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 a6 6. O-O Rb8 7. d3 b5 8. cxb5 axb5 9. Be3 Nd4 10. Rc1 Nh6
1963 Leningrad ch-URS – Round 1 – Stein, Leon Rico – 1-0 – Novopashin, Arkady – G5 1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 a6 5. Nf3 Nc6 6. O-O Nh6 7. Rb1 Nf5 8. a3 Rb8 9. b4 cxb4 10. axb4 b5
1963 New York ch-USA – Round 10 – Addison, Wiliam G – 0-1 – Evans, Larry – G41 1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nc3 a6 6. d3 Rb8 7. Bd2 b5 8. Qc1 d6 9. O-O Bd7 10. h3 bxc4
1964 Amsterdam Interzonal – Round 2 – Benko, Pal – 1/2-1/2 – Evans, Larry M – G12 1. c4 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6 5. Nf3 a6 6. O-O e5 7. a3 Nge7 8. Rb1 Rb8 9. b4 d6 10. bxc5 dxc5
1964 Budapest ch-HUN – Round 1 – Flesch, Jean-benoit – 1/2-1/2 – Portisch, Lajos – G1 1. c4 c5 2. Nc3 g6 3. Nf3 Bg7 4. g3 Nc6 5. Bg2 a6 6. O-O Nh6 7. a3 Rb8 8. b4 cxb4 9. axb4 b5 10. cxb5 axb5
1964 Izt – Round ? – Benko, Pal – 1/2-1/2 – Evans, Larry M – G1 1. c4 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6 5. Nf3 a6 6. O-O e5 7. a3 Nge7 8. Rb1 Rb8 9. b4 d6 10. bxc5 dxc5
1965 Marianske Lazne – Round 2 – Pirc, Vasja – 0-1 – Keres, P. – G12 1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nc3 a6 6. O-O Rb8 7. b3 b5 8. cxb5 axb5 9. Bb2 d6 10. Qc1 e5
1965 Sinaia stud ol prel – Round 1 – Arnaudov, Petar – 0-1 – Kapengut, Albert – G6 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. c4 Bg7 5. Nc3 a6 6. d3 Rb8 7. a4 d6 8. Bd2 Nh6 9. Rb1 Bd7 10. Nd5 Nf5
1966 Rzeszow ch POL – Round 4 – Brzozka, Stefan – 1/2-1/2 – Schmidt, Wlodzimierz – G27 1. Nf3 c5 2. c4 g6 3. g3 Nc6 4. Bg2 Bg7 5. Nc3 a6 6. O-O Rb8 7. a4 d6 8. d3 Nf6 9. d4 cxd4 10. Nxd4 Nxd4
1966 USSR – Round 1 – Arulaid, Alexander – 0-1 – Yim, Tynu – G33 1. Nf3 c5 2. c4 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2 a6 6. O-O Rb8 7. a4 d6 8. d3 Nf6 9. Bd2 O-O 10. Qc1 Bg4
1967 Budapest Bajnogsag 8th – Round 4 – Forintos, Gyozo V – 1/2-1/2 – Kluger, Gyula – G26 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. c4 Nc6 5. Nc3 a6 6. b3 b5 7. cxb5 axb5 8. Bb2 Bb7 9. Qc1 Nf6 10. Nxb5 O-O
1967 Harrachov – Round 1 – Hartston, William R – 1/2-1/2 – Arnaudov, Petar – G117 1. g3 g6 2. Bg2 Bg7 3. c4 c5 4. Nc3 Nc6 5. Nf3 a6 6. O-O Rb8 7. e3 d6 8. d4 Bd7 9. b3 Nh6 10. Bb2 O-O
1967 Rubinstein Memorial – Round 13 – Sliwa, Bogdan – 0-1 – Schmidt, Waldemar – G50 1. c4 g6 2. g3 Bg7 3. Bg2 c5 4. Nc3 Nc6 5. Nf3 a6 6. O-O Rb8 7. a4 d6 8. b3 e6 9. Bb2 Nge7 10. Rc1 O-O
1967 Sochi – Round 14 – Liebert, Heinz – 1/2-1/2 – Ujtelky, Maximilian – G106 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 a6 6. O-O Rb8 7. a4 Nh6 8. d3 Nf5 9. Bd2 h5 10. h3 d6
1967 Szczecin ch POL – Round 3 – Dobrzynski, Wojciech – 0-1 – Bednarski, Jacek B – G18 1. Nf3 g6 2. g3 Bg7 3. Bg2 c5 4. c4 Nc6 5. Nc3 a6 6. O-O Rb8 7. e3 d6 8. d4 cxd4 9. Nxd4 Bd7 10. Nb3 b6
1968 Cordoba op-2 Centro de la Republica – Round 6 – Saadi, Julio – 1-0 – Bronstein, Luis Marcos – G7 1. Nf3 c5 2. c4 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2 a6 6. O-O Rb8 7. d3 d6 8. Be3 Nf6 9. h3 Bd7 10. Qc1 b5
1968 Hoogovens – Round 6 – Langeweg, Kick – 1/2-1/2 – Van Geet, Dirk Daniel – G55 1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nf3 a6 6. Rb1 b5 7. b3 Qa5 8. Bb2 Bb7 9. O-O Nh6 10. Ne4 Bxb2
1968 Lugano ol (Men) fin-A – Round 10 – Barcza, Gedeon – 1/2-1/2 – Schmidt, Waldemar – G52 1. c4 g6 2. g3 Bg7 3. Bg2 c5 4. Nc3 Nc6 5. Nf3 a6 6. a3 Rb8 7. Rb1 b5 8. cxb5 axb5 9. b4 cxb4 10. axb4 e5
1968 Lugano olm - Round 1 - Naranja, Renato - 1-0 - Kagan, Shimon - G12 1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. Nf3 a6 6. O-O Rb8 7. a4 Nh6 8. e4 O-O 9. d3 d6 10. h3 f5
1968 Mar del Plata ch-ARG – Round 6 – Garcia Rodriguez, Raimundo – 1/2-1/2 – Sanguineti, Raúl Carlos – G45 1. g3 g6 2. Bg2 Bg7 3. c4 c5 4. Nc3 Nc6 5. Nf3 a6 6. a3 Rb8 7. Rb1 b5 8. cxb5 axb5 9. b4 cxb4 10. axb4 d5
1968 Warszawa olm qual m – Round 1 – Lewi, Jerzy – 1-0 – Schmidt, Wlodzimierz – G1 1. c4 g6 2. Nf3 c5 3. Nc3 Bg7 4. g3 Nc6 5. Bg2 a6 6. O-O Rb8 7. a4 d6 8. d3 Nf6 9. Bd2 O-O 10. Rb1 Bd7
1969 Hoogovens – Round 5 – Olafsson, Fridrik – 0-1 – Doda, Zbigniew – G41 1. c4 c5 2. Nc3 g6 3. Nf3 Bg7 4. g3 Nc6 5. Bg2 a6 6. O-O Rb8 7. d3 d6 8. Bd2 Nf6 9. Nd5 O-O 10. Bc3 e5
Reykjavik ISL, 22th Open 2006 – Round 9 – Svidler, Peter – 0-1 – Svidler, Peter – G29 1. c4 c5 2. Nf3 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2 a6 6. O-O Rb8 7. b3 b5 8. cxb5 axb5 9. Bb2 d6 10. d3 e5

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