A30h — English: Symmetrical, Hedgehog System

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

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte b5, paire de fous.
Faiblesses adverses : arriéré d7, Bf8 enfermé, roi noir au centre.
Problèmes : Bc1 enfermé, Bg2 enfermé.
Plans :
● d3 — Libérer Bc1
● h3 — Empêcher ...Bg4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : case forte e4, case forte c5, Bb7 actif, paire de fous.
Faiblesses adverses : Bc1 enfermé, Bg2 enfermé.
Problèmes : roi au centre, Bf8 enfermé, arriéré d7, 4 pièces non développées (B8, F8, A8, 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

A30h — Symmetrical Hedgehog System

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

Eval: [+0.31]

Les coups candidats

6…Be7 — 76.6% (13678 parties) →

Ambassadeurs : Ftacnik, Lubomir (122x), Browne, Walter Shawn (52x), Ribli, Zoltan (52x), Ornstein, Axel (43x), Andersson, Ulf (42x), Greenfeld, Alon (42x), Yermolinsky, Alex (38x), Espig, Lutz (35x)

6…a6 — 10.3% (1839 parties) →

Ambassadeurs : Suba, Mihai (52x), Marin, Mihail (30x), Ionescu, Constantin (28x), Wojtkiewicz, Aleksander (25x), Kovacevic, Slobodan (24x), Cosma, Ioan (18x), Stangl, Markus (15x), Hambleton, Aman (15x)

6…d6 — 9.9% (1775 parties) →

Ambassadeurs : Kasparov, Sergey (37x), Wahls, Matthias (25x), Zeller, Frank (22x), Csom, Istvan (20x), Gostisa, Leon (15x), Prie, Eric (12x), Ribli, Zoltan (12x), Adorjan, Andras (11x)

6…Nc6 — 1.7% (301 parties)

Ambassadeurs : De Firmian, Nick (13x), Seirawan, Yasser (6x), Struik, Tjapko (5x), Andersson, Ulf (4x), Stangl, Markus (4x), Shamkovich, Leonid (3x), Salov, Valery (3x), Belozerov, Andrei (3x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	6…Be7	6…a6	6…d6	6…Nc6
<1800	178	80%	4%	7%	2%
1800-2200	3932	80%	9%	8%	2%
2200-2600	11434	75%	12%	11%	1%
2600+	518	81%	9%	7%	2%

Évolution par décennie (% des parties)

Décennie	N parties	6…Be7	6…a6	6…d6	6…Nc6
1920s	11	82%	—	—	18%
1930s	20	60%	5%	—	10%
1940s	13	92%	—	—	—
1950s	79	95%	—	—	3%
1960s	96	91%	—	2%	2%
1970s	556	74%	13%	8%	3%
1980s	1795	77%	10%	10%	2%
1990s	2941	68%	15%	13%	3%
2000s	5520	77%	10%	10%	2%
2010s	5793	80%	8%	9%	1%
2020s	1023	83%	9%	5%	1%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
6…Be7	80%	83%	▲ +3.0%
6…a6	8%	9%	▲ +1.1%
6…d6	9%	5%	▼ -4.0%
6…Nc6	1%	1%	+0.0%

Joueurs célèbres

Champions du monde dans cette position

Smyslov, Vladimir — 10 parties
Tal, Mikhail — 10 parties
Kasparov, Garry — 10 parties
Karpov, Aleksandr — 10 parties
Karpov, Anatoly — 10 parties
Kramnik, Vladimir — 10 parties
Carlsen, Magnus — 10 parties
Hou, Yifan — 7 parties
Botvinnik, Mikhail — 6 parties
Anand, Viswanathan — 5 parties
Ju, Wenjun — 5 parties
Gukesh D — 5 parties
Euwe, Max — 2 parties
Alekhine, Alexander — 1 partie
Ding, Liren — 1 partie

Parties historiques

6…Be7 — 76.6% (13678 parties)

1923 — Walter, Max vs Wolf Heinrich — 0-1 — Maehrisch Ostrau
1926 — Kostic, Boris vs Alimonda, B. — 1-0 — Meran ITA
1927 — Nimzowitsch, Aron vs Colle, Edgar — 1/2-1/2 — Bad Niendorf
1927 — Alekhine, Alexander vs Nimzowitsch, Aron — 1/2-1/2 — New York, NY USA
1927 — Reti, Richard vs Saemisch, Friedrich — 1-0 — Bad Homburg GER

6…a6 — 10.3% (1839 parties)

1934 — Klausen, V. vs Andersen, Erik — 0-1 — Copenhagen DEN
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 — Tal, Mikhail vs Balashov, Yuri — 1/2-1/2 — Erevan ch-URS
1975 — Portisch, Lajos vs Andersson, Ulf — 0-1 — Milan ITA

6…d6 — 9.9% (1775 parties)

1961 — Polak, Jakub vs Brychta, Vaclav — 1-0 — ?
1966 — Pruner, Earl Wilson vs Rubin, Sidney J. — 1-0 — San Francisco, Ca
1973 — Bukic, Enver vs Popov, Luben — 1/2-1/2 — Poiana Brasov
1975 — Romanishin, Oleg M vs Csom, Etelka — 0-1 — Olot
1975 — Vadasz, Laszlo vs Csom, Istvan — 1/2-1/2 — Kecskemet HUN

6…Nc6 — 1.7% (301 parties)

1929 — Capablanca, Jose vs Ayllon Soler, Pablo — 1-0 — Barcelona ESP
1929 — Capablanca, Jose vs Abreu Campanario Soler, Dayana Lucero — 1-0 — Barcelona ESP
1936 — Gereben, Erno vs Lovas, Gyula — 1/2-1/2 — Budapest Budapest HUN
1936 — Menchik, Vera Frantsevna vs Reilly, Tim — 1-0 — Margate Margate ENG
1955 — Solomon, JD. vs Cafferty, Bernard — 0-1 — ?

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	● d7
Chaînes	● f2→g3, h2→g3	● b6→c5, a7→b6, d7→e6, f7→e6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● b5 (2v0)	● e4 (2v1), ● c5 (2v0)
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. 6)
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
1929 Barcelona – Round 9 – Capablanca, Jose – 1-0 – Ayllon Soler, Pablo – G16 1. Nf3 Nf6 2. c4 e6 3. Nc3 b6 4. g3 Bb7 5. Bg2 c5 6. O-O Nc6 7. d4 cxd4 8. Nxd4 Bc5 9. Ndb5 O-O 10. Bg5 Be7
1936 New York ch-USA – Round 2 – Simonson, Albert – 1/2-1/2 – Reshevsky, Samuel – G4 1. c4 Nf6 2. Nf3 e6 3. g3 b6 4. Bg2 Bb7 5. O-O c5 6. Nc3 Qc8 7. b3 Be7 8. Ba3 d5 9. cxd5 Nxd5 10. Nxd5 Bxd5
1937 Stockholm ol – Round 13 – Keres, Paul – 1/2-1/2 – Lilienthal, Andor – G74 1. Nf3 Nf6 2. c4 b6 3. g3 Bb7 4. Bg2 c5 5. O-O e6 6. Nc3 Qc8 7. b3 Be7 8. Bb2 O-O 9. Rc1 Rd8 10. d4 d5
1943 Vienna Ch – Round ? – Lokvenc, Josef – 1-0 – Schwammenhoefer, Karl – G10 1. Nf3 Nf6 2. c4 b6 3. g3 Bb7 4. Bg2 c5 5. O-O e6 6. Nc3 Qc8 7. d4 cxd4 8. Qxd4 d5 9. cxd5 Nxd5 10. Nxd5 Bxd5
1957 USA Ch Open 58th – Round 11 – Byrne, David – 1-0 – Byrne, Robert E – G80 1. Nf3 Nf6 2. c4 c5 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 Qc8 7. d3 Be7 8. e4 O-O 9. Bf4 d6 10. Rc1 Nc6
1960 Balatonfured – Round 10 – Sofrevski, Jovan – 1/2-1/2 – Flohr, Salo – G26 1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. O-O c5 5. c4 e6 6. Nc3 Qc8 7. b3 d5 8. cxd5 Nxd5 9. Bb2 Nxc3 10. Bxc3 Nd7
1962 Varna olm – Round 5 – Clarke, Peter H – 1/2-1/2 – Palsson, Jon Gunnar – G206 1. c4 Nf6 2. Nf3 e6 3. g3 b6 4. Bg2 Bb7 5. O-O c5 6. Nc3 Nc6 7. b3 Be7 8. Bb2 d5 9. cxd5 exd5 10. d4 O-O
1964 Sarajevo 07th – Round 7 – Trifunovic, Petar – 1/2-1/2 – Matulovic, Milan – G15 1. Nf3 c5 2. c4 Nf6 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O Na6 7. b3 Be7 8. Bb2 O-O 9. d4 d5 10. cxd5 Nxd5
1966 Sunderland ch-BCF – Round 9 – Clarke, Paul R H – 1/2-1/2 – Milner Barry, Philip – G77 1. c4 Nf6 2. Nc3 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 c5 6. O-O Nc6 7. b3 Be7 8. Bb2 O-O 9. d4 Nxd4 10. Nxd4 Bxg2
Biel Interzonal 1993 – Round 2 – Ftacnik, Lubomir – 1/2-1/2 – Yudasin, Leonid – G57 1. Nf3 Nf6 2. c4 e6 3. Nc3 b6 4. g3 Bb7 5. Bg2 c5 6. O-O d5 7. cxd5 Nxd5 8. Re1 Be7 9. e4 Nxc3 10. bxc3 O-O
Reggio Emilia9192 1992 – Round 5 – Beliavsky, Alexander G – 1-0 – Salov, Valery – G18 1. Nf3 Nf6 2. c4 e6 3. Nc3 b6 4. g3 c5 5. Bg2 Bb7 6. O-O Nc6 7. e4 d6 8. d4 cxd4 9. Nxd4 Rc8 10. Nxc6 Bxc6
World Cup 1989 – Round ? – Salov, Valery – 0-1 – Seirawan, Yasser – G112 1. Nf3 Nf6 2. c4 e6 3. g3 b6 4. Bg2 Bb7 5. O-O c5 6. Nc3 Nc6 7. b3 Be7 8. Bb2 O-O 9. e3 a6 10. d3 Rc8
World Cup 1991 – Round 4 – Timman, Jan H – 0-1 – Seirawan, Yasser – G32 1. Nf3 Nf6 2. c4 c5 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O Nc6 7. e3 Be7 8. b3 O-O 9. Bb2 Rc8 10. d4 cxd4

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