A37d — English: Symmetrical, 5.Nf3 Nh6 6.O-O

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nh6 6.O-O * ● Trait aux Noirs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Atouts. Les Blancs s'appuient sur les cases fortes b5 et d5 et la paire de fous.

Côté adverse. Le fou enfermé en c8 et le roi resté au centre.

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

Plans. d3 (Libérer Bc1) ; h3 (Empêcher ...Bg4).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

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

Côté adverse. Les fous enfermés en c1 et g2.

En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (le fou c8 et les tours a8 et h8).

Plans. O-O (Mettre le roi en sécurité, connecter les tours) ; ...d6 (Libérer Bc8) ; ...Bg4 (Clouer Nf3) ; ...d5 (Rupture) ; ...e6 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

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	● b5 (2v0), ● d5 (2v0)	● b4 (2v0), ● d4 (3v1), ● e5 (2v1), ● f5 (2v0)
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. 5)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	2 (c1, a1)	3 (c8, a8, h8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Roqué	● Au centre !
Droits de roque	—	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
1954 Amsterdam olm – Round ? – Raizman, Maurice – 1/2-1/2 – Trifunovic, Petar – G178 1. c4 c5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Nf3 Nh6 6. O-O O-O 7. d3 d6 8. h3 Nf5 9. e3 e6 10. Ne4 b6
1955 Hamburg – Round 1 – Pirc, Vasja – 1-0 – Castaldi, Vincenzo – G21 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 Nh6 6. Nc3 O-O 7. d3 Nf5 8. a3 Rb8 9. g4 Nfd4 10. Nd2 Ne5
1955 Hamburg – Round 14 – Heinicke, Herbert – 1-0 – Castaldi, Vincenzo – G111 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. c4 Bg7 5. O-O Nh6 6. Nc3 O-O 7. d3 d6 8. Bd2 Nf5 9. e3 e6 10. Ne1 Bd7
1956 Belgrade – Round 1 – Pirc, Vasja – 1/2-1/2 – Petrosian, Tigran A. – G16 1. Nf3 c5 2. c4 Nc6 3. g3 g6 4. Bg2 Bg7 5. O-O Nh6 6. Nc3 O-O 7. d3 d6 8. Bd2 Nf5 9. a3 a6 10. Rb1 Rb8
1957 Bern – Round 1 – Bouwmeester, Hans – 1-0 – Castaldi, Vincenzo – G7 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 Nh6 6. Nc3 O-O 7. d3 Nf5 8. Bd2 Rb8 9. Rb1 a6 10. Ne4 d6
1958 JUG-13ch Sarajevo BIH – Round 14 – Cuderman, Vinko – 0-1 – Bogdanovic, Rajko – G19 1. c4 g6 2. Nc3 c5 3. g3 Bg7 4. Bg2 Nc6 5. Nf3 Nh6 6. O-O O-O 7. a3 d6 8. Rb1 Nf5 9. d3 Nfd4 10. Bd2 Bg4
1959 Asztalos Memorial 2nd – Round 12 – Bilek, Istvan – 1/2-1/2 – Soos, Bela – G19 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. c4 Nc6 5. O-O Nh6 6. Nc3 Nf5 7. a3 a6 8. Rb1 Rb8 9. b4 cxb4 10. axb4 b5
1959 Candidats Tournament – Round 16 – Olafsson, Fridrik – 1/2-1/2 – Benko, Pal – G59 1. c4 g6 2. g3 Bg7 3. Bg2 c5 4. Nf3 Nc6 5. O-O Nh6 6. Nc3 O-O 7. a3 Rb8 8. b4 b6 9. Rb1 Bb7 10. d3 Nf5
1959 Clare Benedict Cup 06th – Round 1.3 – Darga, Klaus – 1/2-1/2 – Nievergelt, Erwin – G7 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. O-O Nc6 5. c4 Nh6 6. Nc3 Nf5 7. d3 d6 8. Rb1 Rb8 9. Bd2 h5 10. a3 a6
1960 Leningrad ch-URS – Round 6 – Polugaevsky, Lev – 1/2-1/2 – Gufeld, Eduard – G57 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 Nh6 6. Nc3 O-O 7. a3 b6 8. Rb1 Bb7 9. b4 d6 10. d3 Bxc3
1960 Sarajevo – Round 3 – Toran Albero, Roman – 1/2-1/2 – Larsen, Benjamin Holsko – G25 1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nc6 5. O-O Nh6 6. Nc3 O-O 7. a3 d6 8. Rb1 Bg4 9. d3 Qd7 10. Bd2 Nd4
1961 IBM – Round 1 – Cuijpers, Frans Andre – 0-1 – Wade, Robert G – G9 1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nc6 5. O-O Nh6 6. Nc3 O-O 7. Rb1 Nf5 8. a3 Nfd4 9. d3 Nxf3+ 10. Bxf3 b6
1961 Oberhausen etc – Round 6 – Filip, Marius Liviu – 1/2-1/2 – Portisch, Lajos – G166 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 Nh6 6. Nc3 Nf5 7. b3 O-O 8. Bb2 d6 9. d3 Bd7 10. Qd2 Rb8
1962 Moscow – Round 1 – Dely, Peter – 0-1 – Veid, R – G63 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 Nh6 6. Nc3 Nf5 7. b3 O-O 8. Bb2 Nfd4 9. Ne1 d6 10. e3 Ne6
1962 Varna olm – Round 2 – Namzhil – 0-1 – Wade, Robert G – G78 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nh6 6. O-O Nf5 7. d3 d6 8. e4 Nfd4 9. Nxd4 Nxd4 10. Ne2 Bg4
1963 URS Team Ch Moscow RUS – Round 5 – Litvinov, Vladimir – 1/2-1/2 – Osnos, Viatcheslav – G30 1. Nf3 c5 2. g3 Nc6 3. c4 g6 4. Bg2 Bg7 5. O-O Nh6 6. Nc3 O-O 7. e3 d6 8. b3 e5 9. Bb2 f5 10. Nd5 g5
1967 Hoogovens – Round 1 – Ree, Hans – 0-1 – Van Geet, Dirk Daniel – G1 1. c4 c5 2. Nf3 Nc6 3. g3 g6 4. Bg2 Bg7 5. O-O Nh6 6. Nc3 Nf5 7. a3 a6 8. Rb1 Rb8 9. b4 cxb4 10. axb4 b5
1967 Hoogovens-B – Round 2 – Sandor, Bela – 1-0 – Van Wijngaarden, Fedde – G10 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. O-O Nc6 5. c4 Nh6 6. Nc3 a6 7. a3 Rb8 8. Rb1 b5 9. cxb5 axb5 10. b4 cxb4
1968 It Lublin POL – Round 3 – Pytel, Krzysztof – 1/2-1/2 – Filipowicz, Andrzej – G5 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 Nh6 6. Nc3 Nf5 7. b3 d6 8. Bb2 h5 9. h4 a6 10. Rb1 O-O
34. ECC Open 2018 – Round 1.16 – Thorfinnsson, Bjorn – 1/2-1/2 – Donchenko, Alexander – G6 1. c4 c5 2. g3 Nc6 3. Bg2 g6 4. Nf3 Bg7 5. O-O Nh6 6. Nc3 Nf5 7. b3 e6 8. Bb2 d5 9. Na4 Bxb2 10. Nxb2 O-O
42. Olympiad 2016 – Round 1.40 – Sanches, Casanova Romario – 0-1 – Predojevic, Borki – G56 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 Nh6 6. Nc3 Nf5 7. Rb1 b6 8. a3 Bb7 9. e3 O-O 10. Ne2 d5
Brussels blitz 1987 – Round 1 – Ljubojevic, Ljubomir – 1/2-1/2 – Larsen, Bent – G3 1. c4 c5 2. Nf3 Nc6 3. g3 g6 4. Bg2 Bg7 5. O-O Nh6 6. Nc3 Nf5 7. d3 b6 8. Bd2 Bb7 9. Rb1 d6 10. a3 Qd7
Sarajevo 1972 – Round 4 – Bukal, Vladimir Jr. – 1/2-1/2 – Petrosian, Tigran V. – G8 1. c4 g6 2. Nc3 Bg7 3. Nf3 c5 4. g3 Nc6 5. Bg2 Nh6 6. O-O Nf5 7. b3 b6 8. Bb2 Bb7 9. e3 O-O 10. Na4 Bxb2
World Rapid Final 2012 – Round 3 – Svidler, Peter – 1/2-1/2 – Carlsen, Magnus – G17 1. c4 g6 2. Nf3 Bg7 3. g3 c5 4. Bg2 Nc6 5. O-O Nh6 6. Nc3 Nf5 7. a3 O-O 8. b4 Nxb4 9. axb4 cxb4 10. d4 bxc3

A37d —

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nh6 6.O-O

Eval: [+0.16]

Les coups candidats

6…Nf5 — 65.8% (377 parties)

Ambassadeurs : Reuben, Stewart (4x), Gheorghiu, Florin (4x), Milos, Gilberto (3x), Bukal, Vladimir Jr. (2x), Cifuentes Parada, Roberto (2x), Kudrin, Sergey (2x), Van der Wiel, John T.H. (2x), Reizniece, Dana (2x)

6…O-O — 30.2% (173 parties)

Ambassadeurs : Castaldi, Vincenzo (3x), Ivanov, Mikhail M. (3x), Brostrom, Goran (2x), Pirc, Vasja (2x), Gufeld, Eduard (2x), Pfeifer, Peter (2x), Perez Garcia, Rodney Oscar (2x), Gonzales, Renieo (2x)

6…d6 — 2.8% (16 parties) →

Ambassadeurs : Damjanovic, Mato (2x), Cardoso, Ruth (1x), Barcza, Gedeon (1x), Mehl, Ronald (1x), Bauer, Norbert (1x), Trachsel, Peter (1x), Koka, Osman (1x), Tatarczak, Jan (1x)

6…a6 — 0.5% (3 parties)

Ambassadeurs : Sandor, Bela (1x), Van Wijngaarden, Fedde (1x), Bruch, Jochen (1x), Biehler, Thomas (1x), Stroppa, Daniel (1x), Leroy, Didier (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	6…Nf5	6…O-O	6…d6	6…a6
<1800	6	67%	17%	17%	—
1800-2200	129	63%	33%	2%	—
2200-2600	355	71%	26%	3%	1%
2600+	6	100%	—	—	—

Évolution par décennie (% des parties)

Décennie	N parties	6…Nf5	6…O-O	6…d6	6…a6
1880s	1	—	100%	—	—
1930s	2	50%	50%	—	—
1950s	10	20%	80%	—	—
1960s	21	57%	38%	—	5%
1970s	18	50%	39%	11%	—
1980s	28	57%	43%	—	—
1990s	112	57%	38%	4%	1%
2000s	154	68%	27%	3%	1%
2010s	196	73%	23%	3%	—
2020s	31	81%	19%	—	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
6…Nf5	73%	81%	▲ +7.7%
6…O-O	23%	19%	▼ -4.1%
6…d6	3%	0%	▼ -2.6%
6…a6	0%	0%	+0.0%

Joueurs célèbres

Champions du monde dans cette position

Carlsen, Magnus — 1 partie

Parties historiques

6…Nf5 — 65.8% (377 parties)

1939 — Danielsson, Gosta vs Kleinstein, Zelman — 1-0 — Buenos Aires ARG
1959 — Bilek, Istvan vs Soos, Bela — 1/2-1/2 — Balatonfured
1959 — Darga, Klaus vs Nievergelt, Erwin — 1/2-1/2 — Lugano SUI
1960 — Drobyshevsky A vs Salov, Sergej — 0-1 — ?
1961 — Filip, Marius Liviu vs Portisch, Lajos — 1/2-1/2 — Oberhausen etc

6…O-O — 30.2% (173 parties)

1889 — Blackburne, Joseph vs Metger, Johannes — 1-0 — Breslau GER
1932 — Sapira, Emmanuel vs Koltanowski, George — 0-1 — Antwerp BEL
1954 — Raizman, Maurice vs Trifunovic, Petar — 1/2-1/2 — Amsterdam NED
1955 — Heinicke, Herbert vs Castaldi, Vincenzo — 1-0 — Hamburg GER
1955 — Pirc, Vasja vs Castaldi, Vincenzo — 1-0 — Hamburg GER

6…d6 — 2.8% (16 parties)

1970 — Cardoso, Ruth vs Damjanovic, Mato — 0-1 — Reggio Emilia ITA
1972 — Barcza, Gedeon vs Damjanovic, Mato — 1/2-1/2 — Zagreb CRO
1990 — Tatarczak, Jan vs Krylov, Sergey — 0-1 — Segovia
1994 — Mehl, Ronald vs Bauer, Norbert — 1-0 — Mecklenburg VP
1996 — Trachsel, Peter vs Koka, Osman — 1/2-1/2 — Bern open

6…a6 — 0.5% (3 parties)

1967 — Sandor, Bela vs Van Wijngaarden, Fedde — 1-0 — Beverwijk NED
1998 — Bruch, Jochen vs Biehler, Thomas — 1-0 — Oberliga Sued W9798
2001 — Stroppa, Daniel vs Leroy, Didier — 0-1 — France

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