A30m — English: Symmetrical, Hedgehog System

1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 * ○ Trait aux Blancs

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, Be7 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, Be7 enfermé, arriéré d7, 3 pièces non développées (B8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...Nc6 — Développer Nb8
● ...Bg4 — Clouer Nf3
● ...d6 — Rupture
● ...d5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

A30m — Symmetrical Hedgehog System

1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7

Eval: [+0.31]

Les coups candidats

7.d4 — 50.3% (7051 parties) →

Ambassadeurs : Ftacnik, Lubomir (70x), Andersson, Ulf (38x), Browne, Walter Shawn (37x), Ribli, Zoltan (35x), Adamski, Jan (28x), Yermolinsky, Alex (28x), Espig, Lutz (24x), Portisch, Lajos (22x)

7.Re1 — 30.1% (4210 parties) →

Ambassadeurs : Ftacnik, Lubomir (32x), Chuchelov, Vladimir (18x), Akesson, Ralf (18x), Shipov, Sergei (17x), Ornstein, Axel (15x), Ulybin, Mikhail (15x), Greenfeld, Alon (14x), Pogorelov, Ruslan (13x)

7.b3 — 13.5% (1896 parties) →

Ambassadeurs : Ftacnik, Lubomir (20x), Suba, Mihai (12x), Ribli, Zoltan (10x), Espig, Lutz (10x), Smejkal, Jan (9x), Plachetka, Jan (8x), Karlsson, Lars 1937 (7x), Gipslis, Aivars (7x)

7.d3 — 3.4% (472 parties)

Ambassadeurs : Demeter, Peter (3x), Shchekachev, Andrei (3x), Adamowicz, Maciej (3x), Langlois-Remillard, Alexis (3x), Lewyk, Ihor (3x), Kostic, Boris (2x), Reti, Richard (2x), Maslikova, Veronika (2x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	7.d4	7.Re1	7.b3	7.d3
<1800	151	42%	19%	14%	13%
1800-2200	3270	48%	25%	15%	6%
2200-2600	8683	50%	34%	13%	1%
2600+	428	53%	35%	11%	1%

Évolution par décennie (% des parties)

Décennie	N parties	7.d4	7.Re1	7.b3	7.d3
1920s	10	30%	—	20%	50%
1930s	13	62%	—	15%	15%
1940s	15	33%	7%	53%	7%
1950s	78	72%	1%	22%	1%
1960s	91	74%	2%	15%	7%
1970s	420	65%	7%	22%	4%
1980s	1397	65%	12%	19%	2%
1990s	2034	49%	29%	15%	4%
2000s	4327	41%	41%	12%	3%
2010s	4745	53%	30%	12%	4%
2020s	876	52%	31%	13%	2%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
7.d4	53%	52%	-0.1%
7.Re1	30%	31%	▲ +1.4%
7.b3	12%	13%	▲ +1.6%
7.d3	4%	2%	▼ -2.0%

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 — 4 parties
Gukesh D — 4 parties
Euwe, Max — 2 parties
Alekhine, Alexander — 1 partie

Parties historiques

7.d4 — 50.3% (7051 parties)

1923 — Walter, Max vs Wolf Heinrich — 0-1 — Maehrisch Ostrau
1927 — Nogues Acuna, Alejandro vs Louviau, Arsene — 1-0 — London ENG
1928 — Van Hoorn, Peter vs Colle, Edgar — 1/2-1/2 — Amsterdam NED
1930 — Takacs, Sandor vs Sultan Khan, Mir — 1/2-1/2 — Hamburg olm
1931 — Botvinnik, Mikhail vs Kubbel, Arvid Ivanovich K — 1-0 — Leningrad RUS

7.Re1 — 30.1% (4210 parties)

1948 — De Freitas, Manuela Schmitz vs Luckis, Marcos — 1-0 — Mar del Plata ARG
1951 — Coosemans, Billy vs Boey, Josef — 1-0 — Antwerp BEL
1960 — Peterson, Andrejs vs Antoshin, Vladimir S — 1/2-1/2 — Vilnius LTU
1968 — Skegina, Klaara vs ? — 1-0 — Ashkhabad
1974 — Shirazi, Kamran vs Sharif, Mehrshad — 0-1 — Iran

7.b3 — 13.5% (1896 parties)

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
1930 — Illingworth, Leonard vs Mortlock, Alfred — 1-0 — Hastings ENG
1937 — Schreiber Pitot, Beryl vs Barcza, Gedeon — 1-0 — Budapest HUN
1940 — Goldberg, Grigory A vs Zhukhovitsky, Samuel — 1-0 — Kiev UKR

7.d3 — 3.4% (472 parties)

1926 — Kostic, Boris vs Alimonda, B. — 1-0 — Meran ITA
1926 — Reti, Richard vs Gruenfeld, Ernst — 1-0 — Semmering AUT
1927 — Reti, Richard vs Saemisch, Friedrich — 1-0 — Bad Homburg GER
1927 — Gruber, Theodor vs Becker, Albert — 0-1 — Vienna AUT
1928 — Kostic, Boris vs Steiner, Endre — 1/2-1/2 — Trencianske Teplice SVK

	♔ 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)
Be7		● Be7 Enfermé (mob. 2)
Paire de fous	● Oui	● Oui
Non développées	2 (c1, a1)	3 (b8, 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
11. Tal Mem Blitz 2018 – Round 5.6 – Dubov, Daniil – 0-1 – Grischuk, Alexander – G34 1. c4 Nf6 2. Nc3 c5 3. g3 e6 4. Nf3 b6 5. Bg2 Bb7 6. O-O Be7 7. d3 O-O 8. e4 d6 9. Re1 a6 10. b3 Nbd7
1926 Merano – Round 11 – Kostic, Boris – 1-0 – Alimonda, B. – G33 1. c4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5 5. O-O e6 6. Nc3 Be7 7. d3 d5 8. Ne5 O-O 9. d4 Nbd7 10. cxd5 Nxd5
1926 Semmering – Round 1 – Reti, Richard – 1-0 – Gruenfeld, Ernst – G101 1. Nf3 Nf6 2. c4 e6 3. g3 b6 4. Bg2 Bb7 5. O-O Be7 6. Nc3 c5 7. d3 O-O 8. e4 d6 9. Re1 e5 10. Nh4 Nc6
1927 Trebitsch Memorial 11th – Round 7 – Gruber, Theodor – 0-1 – Becker, Albert – G17 1. Nf3 Nf6 2. c4 e6 3. g3 b6 4. Bg2 Bb7 5. Nc3 c5 6. O-O Be7 7. d3 d6 8. a3 Nbd7 9. e4 Rc8 10. Qe2 Ne5
1928 Trencianske Teplice SVK – Round 8 – Kostic, Boris – 1/2-1/2 – Steiner, Endre – G11 1. Nf3 c5 2. c4 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 Be7 7. d3 O-O 8. e4 Qc8 9. Re1 d6 10. b3 Na6
1935 Tatatovaros – Round 1 – Lovas, Gyula – 1/2-1/2 – Von Balla, Zoltan – G7 1. Nf3 c5 2. c4 e6 3. g3 b6 4. Bg2 Bb7 5. O-O Nf6 6. Nc3 Be7 7. d3 O-O 8. e4 d5 9. Qc2 Nc6 10. h3 a6
1938 URS Ch, semi final – Round 1 – Pogrebissky, Iosif – 1-0 – Kotov Lundqvist, Alex – G58 1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. O-O e6 5. c4 Be7 6. Nc3 c5 7. e3 O-O 8. d4 cxd4 9. exd4 Qc8 10. b3 d5
1946 URS-USA – Round 1 – Kevitz, Alexander – 1/2-1/2 – Bondarevsky, Igor – G7 1. Nf3 Nf6 2. c4 b6 3. g3 Bb7 4. Bg2 c5 5. O-O e6 6. Nc3 Be7 7. d3 O-O 8. e4 d6 9. Re1 e5 10. Nh4 Nc6
1956 Moscow olm fin-A – Round 8 – Poulsen, Christian – 0-1 – Porath, Yosef – G139 1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. O-O c5 5. c4 e6 6. Nc3 Be7 7. d3 O-O 8. e4 Nc6 9. d4 cxd4 10. Nxd4 Rc8
1958 OWL Ch – Round 11 – Juergens Norbert – 1/2-1/2 – Hantke Rolf – G28 1. c4 Nf6 2. Nc3 c5 3. Nf3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O Be7 7. e3 O-O 8. Re1 d5 9. cxd5 exd5 10. d4 Nbd7
1959 Lodz ch POL – Round 16 – Drozd, Ryszard – 1/2-1/2 – Knapczyk, Edward – G79 1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. O-O e6 5. c4 c5 6. Nc3 Be7 7. e3 O-O 8. d4 d5 9. cxd5 Nxd5 10. Nxd5 Bxd5
1965 Hungary – Round 1 – Hajtun, Joseph – 0-1 – Pogats, Jozsef Jr. – G8 1. c4 Nf6 2. Nf3 e6 3. g3 b6 4. Bg2 Bb7 5. O-O c5 6. Nc3 Be7 7. d3 d5 8. cxd5 Nxd5 9. Qa4+ Qd7 10. Qg4 Nxc3
1968 Hungary – Round 1 – Bilek, Istvan – 1/2-1/2 – Barcza, Gedeon – G6 1. c4 e6 2. Nf3 c5 3. g3 b6 4. Bg2 Bb7 5. Nc3 Nf6 6. O-O Be7 7. d3 d5 8. Ne5 O-O 9. d4 Ne4 10. Nxe4 dxe4
1969 URS Ch sf – Round ? – Bronstein, David I – 1-0 – Petkevich, Jusefs – G2 1. c4 c5 2. Nc3 e6 3. Nf3 Nf6 4. g3 b6 5. Bg2 Bb7 6. O-O Be7 7. d3 O-O 8. e4 d6 9. Ne1 Nc6 10. f4 Rb8
Bugojno 1982 – Round 1 – Larsen, Bent – 1-0 – Andersson, Ulf 1949 – G11 1. c4 Nf6 2. Nc3 c5 3. g3 e6 4. Nf3 b6 5. Bg2 Bb7 6. O-O Be7 7. d3 d5 8. cxd5 Nxd5 9. Qa4+ Nd7 10. e4 Nxc3
URS Team Ch Moscow 1972 – Round 1 – Smyslov, Vassily – 1-0 – Dzindzichashvili, Roman – G1 1. c4 c5 2. Nf3 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 Be7 7. Qc2 O-O 8. e4 d6 9. d4 cxd4 10. Nxd4 Nbd7
World Blitz 2018 – Round 6.17 – Dubov, Daniil – 1/2-1/2 – Jakovenko, Dmitry – G340 1. c4 c5 2. Nf3 Nf6 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O Be7 7. d3 d5 8. Ne5 O-O 9. d4 cxd4 10. Qxd4 Nbd7
World Blitz 2021 – Round 13.56 – Demidov, Mikhail – 1-0 – Bologan, Victor – G795 1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. O-O c5 5. c4 e6 6. Nc3 Be7 7. d3 d5 8. cxd5 Nxd5 9. Qa4+ Bc6 10. Qg4 O-O

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