A30i — English: Symmetrical, Hedgehog, 6…a6

1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 a6 * ○ Trait aux Blancs

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 la paire de fous.

Côté adverse. Le fou enfermé en f8 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 la case forte e4, un fou actif en b7 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 cavalier b8, le fou f8 et les tours a8 et h8).

Plans. O-O (Mettre le roi en sécurité, connecter les tours) ; ...Nc6 (Développer Nb8) ; ...Be7 (Développer Bf8) ; ...Bg4 (Clouer Nf3) ; ...d6 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→g3, h2→g3	● b6→c5, d7→e6, f7→e6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	● e4 (2v1)
Cases faibles	—	—
Centre	● e5 (1v0)	● d5 (3v2), ● e4 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bg2	● Bg2 Enfermé (mob. 2)
Bb7		● Bb7 Actif (mob. 5)
Bf8		● Bf8 Non développé (mob. 2)
Paire de fous	● Oui	● Oui
Non développées	2 (c1, a1)	4 (b8, f8, 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, ● …e6-e5

Partie
1934 Copenhagen – Round 1 – Klausen, V. – 0-1 – Andersen, Erik – G1 1. c4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 e6 5. O-O c5 6. Nc3 a6 7. d3 Qc7 8. a3 Be7 9. Rb1 Nc6 10. Bf4 d6
20. European Teams 2015 – Round 9.12 – Laznicka, Viktor – 1/2-1/2 – Perunovic, Milos – G375 1. Nf3 c5 2. c4 Nf6 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 Be7 8. d4 cxd4 9. Nxd4 Bxg2 10. Kxg2 Qc7
41. Olympiad Open 2014 – Round 10.7 – Grischuk, Alexander – 1/2-1/2 – Perunovic, Milos – G732 1. c4 c5 2. Nc3 Nf6 3. g3 e6 4. Nf3 b6 5. Bg2 Bb7 6. O-O a6 7. d4 cxd4 8. Qxd4 d6 9. Bg5 Nbd7 10. Qd2 Rc8
43. Olympiad 2018 – Round 1.7 – Kojima, Shinya – 1/2-1/2 – Sargissian, Gabriel – G70 1. Nf3 Nf6 2. c4 c5 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. d4 cxd4 8. Qxd4 d6 9. Bg5 Nbd7 10. Rfd1 Be7
Amber-rapid 13th 2004 – Round 3 – Gelfand, Boris – 0-1 – Ivanchuk, Vasyl – G9 1. Nf3 Nf6 2. c4 c5 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 d6 8. Bb2 Be7 9. e3 O-O 10. Qe2 Nbd7
Amber-rapid 20th 2011 – Round 7 – Kramnik, Vladimir – 0-1 – Carlsen, Magnus – G21 1. Nf3 Nf6 2. c4 b6 3. g3 c5 4. Bg2 Bb7 5. O-O e6 6. Nc3 a6 7. b3 Be7 8. Bb2 O-O 9. e3 d6 10. d4 Ne4
Bugojno 1978 – Round 14 – Huebner, Robert – 1-0 – Ljubojevic, Ljubomir – G81 1. Nf3 c5 2. c4 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 a6 7. d4 cxd4 8. Qxd4 d6 9. b3 Nbd7 10. Bb2 Be7
Erevan ch-URS 1975 – Round 1 – Petrosian, Tigran V. – 1/2-1/2 – Balashov, Yuri S – G14 1. c4 Nf6 2. Nc3 e6 3. Nf3 c5 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. Re1 d6 8. e4 Nbd7 9. b3 Be7 10. d4 cxd4
Erevan ch-URS 1975 – Round 1 – Tal, Mikhail – 1/2-1/2 – Balashov, Yuri S – G10 1. c4 Nf6 2. Nc3 e6 3. Nf3 c5 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. Re1 d6 8. d4 cxd4 9. Nxd4 Bxg2 10. Kxg2 Be7
IBM 1978 – Round 6 – Nikolac, Juraj – 1-0 – Ljubojevic, Ljubomir – G17 1. Nf3 c5 2. c4 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 a6 7. b3 d6 8. Bb2 Nbd7 9. e3 Rb8 10. Qe2 Be7
Interpolis 1984 – Round 1 – Miles, Anthony J – 1/2-1/2 – Tukmakov, Vladimir B – G8 1. c4 Nf6 2. Nc3 c5 3. g3 e6 4. Nf3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 d6 8. Bb2 Be7 9. d4 cxd4 10. Nxd4 Bxg2
Interpolis 1987 – Round ? – Korchnoi, Viktor – 1/2-1/2 – Sokolov, Andrei – G32 1. c4 Nf6 2. Nf3 e6 3. Nc3 c5 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 Qc7 8. e3 Be7 9. d4 cxd4 10. exd4 d5
Interpolis 1987 – Round 1 – Andersson, Ulf 1949 – 1/2-1/2 – Sokolov, Andrei – G27 1. Nf3 c5 2. c4 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 a6 7. b3 Qc7 8. Bb2 Be7 9. e3 O-O 10. Qe2 Rd8
Interpolis 1989 – Round 2 – Korchnoi, Viktor – 1/2-1/2 – Ivanchuk, Vasyl – G7 1. c4 Nf6 2. Nc3 c5 3. Nf3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 d6 8. Bb2 Be7 9. d4 cxd4 10. Nxd4 Bxg2
Linares 1985 – Round 1 – Miles, Anthony J – 1/2-1/2 – Polugaevsky, Lev – G6 1. c4 e6 2. Nc3 c5 3. Nf3 Nf6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 Be7 8. Bb2 O-O 9. d4 cxd4 10. Nxd4 Bxg2
Manila Manila PHI 1975 – Round 3 – Mecking, Henrique – 1/2-1/2 – Ljubojevic, Ljubomir – G4 1. Nf3 Nf6 2. c4 e6 3. Nc3 c5 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 d6 8. Bb2 Be7 9. d4 cxd4 10. Nxd4 Bxg2
Milaan 1975 – Round 6 – Portisch, Lajos – 0-1 – Andersson, Ulf 1949 – G22 1. c4 Nf6 2. Nc3 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 c5 6. O-O a6 7. d4 cxd4 8. Qxd4 d6 9. b3 Nbd7 10. e4 Be7
Milaan m sf 1975 – Round 3 – Portisch, Lajos – 1-0 – Ljubojevic, Ljubomir – G4 1. Nf3 c5 2. c4 Nf6 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. Re1 d6 8. e4 Nbd7 9. d3 Be7 10. h3 O-O
Moscow 1975 – Round 1 – Korchnoi, Viktor – 1-0 – Garcia Martinez, Silvino – G53 1. Nf3 Nf6 2. c4 c5 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 d6 8. d4 cxd4 9. Qxd4 Nbd7 10. Bb2 Be7
Moscow Interzonal 1982 – Round 3 – Andersson, Ulf 1949 – 1-0 – Gheorghiu, Florin – G10 1. c4 c5 2. Nf3 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 a6 7. b3 Be7 8. d4 cxd4 9. Qxd4 d6 10. Ba3 Nc6
World Blitz Final 2012 – Round 12 – Radjabov, Teimour – 0-1 – Carlsen, Magnus – G93 1. Nf3 c5 2. c4 Nf6 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. Re1 d6 8. e4 Be7 9. d4 cxd4 10. Nxd4 Qc7
World Cup 1988 – Round 1 – Andersson, Ulf 1949 – 0-1 – Hjartarson, Johann – G71 1. Nf3 Nf6 2. c4 b6 3. g3 Bb7 4. Bg2 c5 5. O-O e6 6. Nc3 a6 7. b3 d6 8. Bb2 Be7 9. e3 O-O 10. Qe2 Nbd7
World Cup 1988 – Round 1 – Korchnoi, Viktor – 0-1 – Hjartarson, Johann – G98 1. Nf3 Nf6 2. c4 b6 3. g3 c5 4. Bg2 Bb7 5. O-O e6 6. Nc3 a6 7. b3 d6 8. d4 cxd4 9. Nxd4 Qc7 10. Bxb7 Qxb7
World Cup 1989 – Round 1 – Karpov, Anatoly – 1-0 – Hjartarson, Johann – G87 1. Nf3 Nf6 2. c4 c5 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 d6 8. Bb2 Be7 9. d4 cxd4 10. Nxd4 Bxg2
World Cup 1991 – Round 15 – Andersson, Ulf 1949 – 1/2-1/2 – Hjartarson, Johann – G112 1. Nf3 Nf6 2. c4 c5 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. b3 d6 8. Bb2 Be7 9. e3 O-O 10. Qe2 Nbd7
Zuerich Champions rap 2009 – Round 3 – Karpov, Anatoly – 1/2-1/2 – Topalov, Veselin – G8 1. Nf3 c5 2. c4 Nf6 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O a6 7. d4 cxd4 8. Nxd4 Bxg2 9. Kxg2 Qc8 10. Qd3 Nc6

A30i — Symmetrical Hedgehog

1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 a6

Eval: [+0.48]

Les coups candidats

7.d4 — 37.2% (708 parties)

Ambassadeurs : Suba, Mihai (26x), Cosma, Ioan (10x), Gheorghiu, Florin (8x), Krallmann, Matthias (7x), Pogorelov, Ruslan (7x), Marin, Mihail (7x), Kovacevic, Slobodan (6x), Schmidt, Wlodzimierz (6x)

7.Re1 — 31.7% (602 parties)

Ambassadeurs : Wojtkiewicz, Aleksander (10x), Marin, Mihail (10x), Suba, Mihai (9x), Ionescu, Constantin (8x), Kovacevic, Slobodan (6x), Bogosavljevic, Boban (6x), Aroshidze, Levan (5x), Perunovic, Milos (5x)

7.b3 — 24.5% (466 parties)

Ambassadeurs : Suba, Mihai (16x), Kovacevic, Slobodan (9x), Andersson, Ulf (9x), Marin, Mihail (8x), Wojtkiewicz, Aleksander (7x), Hjartarson, Johann (6x), Espig, Lutz (6x), Korchnoi, Viktor (5x)

7.d3 — 2.9% (55 parties)

Ambassadeurs : Broffman, Peter (2x), Olesen, Martin (2x), Klausen, V. (1x), Andersen, Erik (1x), Kristiansen, Jens (1x), Sorensen, Torben (1x), Lehmann, Heinz (1x), Foisor, Ovidiu-Doru (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	7.d4	7.Re1	7.b3	7.d3
<1800	10	10%	30%	30%	20%
1800-2200	365	36%	26%	22%	7%
2200-2600	1361	37%	34%	25%	1%
2600+	47	30%	28%	40%	2%

Évolution par décennie (% des parties)

Décennie	N parties	7.d4	7.Re1	7.b3	7.d3
1930s	1	—	—	—	100%
1970s	74	38%	8%	54%	—
1980s	183	44%	13%	39%	3%
1990s	466	38%	31%	24%	3%
2000s	570	35%	37%	20%	2%
2010s	507	37%	35%	21%	4%
2020s	100	39%	34%	18%	4%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
7.d4	37%	39%	▲ +2.1%
7.Re1	35%	34%	▼ -1.3%
7.b3	21%	18%	▼ -3.3%
7.d3	4%	4%	+0.3%

Joueurs célèbres

Champions du monde dans cette position

Karpov, Anatoly — 4 parties
Tal, Mikhail — 3 parties
Kramnik, Vladimir — 3 parties
Carlsen, Magnus — 3 parties
Karpov, Aleksandr — 2 parties
Kasparov, Garry — 1 partie
Ju, Wenjun — 1 partie
Ding, Liren — 1 partie
Gukesh D — 1 partie

Parties historiques

7.d4 — 37.2% (708 parties)

1975 — Petrosian, Tigran V. vs Garcia Martinez, Silvino — 1-0 — Moscow RUS
1975 — Petrosian, Tigran V. vs Andersson, Ulf — 1/2-1/2 — Milan ITA
1975 — Portisch, Lajos vs Andersson, Ulf — 0-1 — Milan ITA
1976 — Karpov, Anatoly vs Ljubojevic, Ljubomir — 1/2-1/2 — Manila PHI
1976 — Smejkal, Jan vs Velimirovic, Dragoljub — 1-0 — Novi Sad Novi Sad YUG

7.Re1 — 31.7% (602 parties)

1975 — Tal, Mikhail vs Balashov, Yuri — 1/2-1/2 — Erevan ch-URS
1975 — Petrosian, Tigran A. vs Balashov, Yuri — 1/2-1/2 — Erevan ch-URS
1975 — Portisch, Lajos vs Ljubojevic, Ljubomir — 1-0 — Milaan m sf
1978 — Spassov, Liuben vs Garcia Martinez, Silvino — 1/2-1/2 — Buenos Aires ARG
1978 — Meduna, Eduard vs Boensch, Uwe — 0-1 — It Halle GER

7.b3 — 24.5% (466 parties)

1975 — Korchnoi, Viktor vs Garcia Martinez, Silvino — 1-0 — Moscow RUS
1975 — Mecking, Henrique vs Ljubojevic, Ljubomir — 1/2-1/2 — Manila Manila PHI
1976 — Eising, Johannes vs Lindoerfer, Klaus — 1-0 — FRG-ch Bad Pyrmont GER
1976 — Bisguier, Arthur B vs Berry, David — 1-0 — 06, Lone Pine
1976 — Pfleger, Helmut, Dr. vs Karpov, Aleksandr — 0-1 — Montilla Moriles

7.d3 — 2.9% (55 parties)

1934 — Klausen, V. vs Andersen, Erik — 0-1 — Copenhagen DEN
1988 — Kristiansen, Jens vs Sorensen, Torben — 1-0 — ?
1988 — Lehmann, Heinz vs Foisor, Ovidiu-Doru — 0-1 — Berlijn open
1988 — Broffman, Peter vs Scoones, Dan — 1/2-1/2 — Victoria CAN
1988 — Broffman, Peter vs Scoones Daniel — 1/2-1/2 — ?

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