A29s — English: Four Knights, 4.g3 Bc5

1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3 Bc5 5.Bg2 d6 6.O-O O-O 7.d3 * ● Trait aux Noirs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte e4, case forte b5, case forte d5, case forte g5, paire de fous.
Faiblesses adverses : Bc8 enfermé.
Problèmes : Bc1 enfermé, Bg2 enfermé.
Plans :
● Bg5 — Clouer Nf6
● 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 g4, case forte e5, avant-postes d4(F), c5(F), Bc5 actif, paire de fous.
Faiblesses adverses : Bc1 enfermé, Bg2 enfermé.
Problèmes : Bc8 enfermé.
Plans :
● ...Bg4 — Développer Bc8, clouer Nf3
● ...d5 — Rupture
● ...e4 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

A29s — Four Knights

1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3 Bc5 5.Bg2 d6 6.O-O O-O 7.d3

Eval: [+0.26]

Les coups candidats

7…h6 — 63.9% (1535 parties)

Ambassadeurs : Beck, Georges (16x), Morley, Paul (13x), Hillebrand, Carsten (10x), Wolter, Uwe (7x), Vetter, Udo (6x), Portych, Václav (6x), Semmelroth, Heinz-Dieter (6x), Niewold, Jaap (5x)

7…a6 — 10.2% (244 parties)

Ambassadeurs : Gulko, Boris (4x), Korneev, Oleg (3x), Andersson, Ulf (2x), Wolff, Patrick G (2x), Vujadinovic, Milan (2x), McKlveen, Paul (2x), Wolter, Uwe (2x), Grott, Peter (2x)

7…Bg4 — 7.2% (173 parties)

Ambassadeurs : Engelbrecht, Alfred (2x), Lochte, Thomas (2x), Bruno Pat (2x), Hort Wolfgang (2x), Mary, Patrick (2x), Martins Barriga, Floriano de los Áng (2x), Hess, Volker (2x), Meiners, Edwin (2x)

7…Be6 — 5.9% (142 parties)

Ambassadeurs : Korchut, Adam (6x), Barbageorgopoulou, Fani (2x), Vladut, Matei (2x), Filip, Miroslav (1x), Keres, Paul Petrovich (1x), Carlsson, Michael (1x), Adler, Bo (1x), Van den Berg, Jacqueline (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	7…h6	7…a6	7…Bg4	7…Be6
<1800	120	53%	10%	12%	8%
1800-2200	845	67%	11%	7%	4%
2200-2600	714	75%	14%	2%	1%
2600+	43	74%	23%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	7…h6	7…a6	7…Bg4	7…Be6
1900s	1	—	—	100%	—
1920s	4	75%	—	25%	—
1930s	2	—	—	50%	—
1940s	2	100%	—	—	—
1950s	3	—	—	—	33%
1960s	5	80%	—	—	—
1970s	22	41%	9%	—	9%
1980s	39	64%	8%	3%	18%
1990s	321	50%	13%	10%	9%
2000s	699	62%	9%	7%	6%
2010s	1202	70%	10%	6%	4%
2020s	101	53%	14%	11%	5%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
7…h6	70%	53%	▼ -16.9%
7…a6	10%	14%	▲ +3.9%
7…Bg4	6%	11%	▲ +4.7%
7…Be6	4%	5%	▲ +0.5%

Joueurs célèbres

Champions du monde dans cette position

Karpov, Aleksandr — 4 parties
Karpov, Anatoly — 3 parties
Euwe, Max — 1 partie
Tal, Mikhail — 1 partie
Anand, Viswanathan — 1 partie
Kasparov, Garry — 1 partie
Carlsen, Magnus — 1 partie

Parties historiques

7…h6 — 63.9% (1535 parties)

1926 — Antze, Oskar vs Saemisch, Friedrich — 1-0 — Hannover GER
1927 — Antze, Oskar vs Bogoljubow, Efim — 1-0 — Bremen GER
1927 — Carls, Carl vs Bogoljubow, Efim — 1/2-1/2 — Bremen GER
1943 — Carls, Carl vs Dietze, Max — 1/2-1/2 — Prague CZE
1947 — Montuoro, Ippolito vs Riello, Michele — 0-1 — Venice ITA

7…a6 — 10.2% (244 parties)

1974 — Andersson, Ulf vs Garcia, Gildardo — 1/2-1/2 — Las Palmas ESP
1974 — Andersson, Ulf vs Garcia Gonzales, Guillermo — 1/2-1/2 — Las Palmas ESP
1981 — Raupp, Thomas vs Treppner, Gerd — 1/2-1/2 — Duitsland tt
1982 — Grathwohl, Roland vs Neunhoeffer, Helmut, Dr. — 0-1 — Kirchheim GER ch-Bad
1988 — Pasqualin, Giorgio vs Schmeidler, Martin — 1/2-1/2 — Roncegno

7…Bg4 — 7.2% (173 parties)

1906 — Curt, Elmin vs Raubitschek, Robert — 1/2-1/2 — Trenton Falls
1925 — Carls, Carl vs Bogoljubow, Efim — 1/2-1/2 — Baden-Baden GER
1939 — Bernstein, Neil A vs Pavey, Max — 0-1 — Aberdeen SCO
1984 — Ardila Figueredo, Juan Diego vs Cardenal Durand, Tomas — 1-0 — cr.
1990 — Brooks, Ian S Dr vs Morton, William — 1-0 — corr

7…Be6 — 5.9% (142 parties)

1956 — Filip, Miroslav vs Keres, Paul Petrovich — 1/2-1/2 — Amsterdam NED
1972 — Liebert, Heinz vs Uhlmann, Wolfgang — 0-1 — Leipzig GER
1974 — Eusebi, Ed vs Benson, Gary S — 0-1 — ?
1980 — Carlsson, Michael vs Adler, Bo — 1-0 — corr SWE/K tt
1980 — Karpov, Anatoly vs Super-System-III-Cg — 1-0 — Bad Kissingen GER

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● e2→d3, f2→g3, h2→g3, d3→c4	● d6→e5, c7→d6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e4 (2v1), ● b5 (2v0), ● d5 (2v1), ● g5 (2v0)	● b4 (2v0), ● d4 (3v1), ● g4 (2v0), ● e5 (2v1)
Cases faibles	—	—
Centre	● d5 (2v1), ● e4 (2v1)	● d4 (3v1), ● e5 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bg2	● Bg2 Enfermé (mob. 2)
Bc5		● Bc5 Actif (mob. 6)
Bc8		● Bc8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Clouages	● pawn f2	—
Non développées	2 (c1, a1)	2 (c8, a8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Roqué	● Roqué
Droits de roque	—	—

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	semi-ouvert
Ruptures	● d3-d4, ● e2-e3	● …d6-d5, ● …e5-e4

Partie
1925 Baden-Baden – Round 1 – Carls, Carl – 1/2-1/2 – Bogoljubow, Efim – G11 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. d3 O-O 7. O-O Bg4 8. h3 Bh5 9. Ne4 Nxe4 10. dxe4 Rb8
1926 Hannover – Round 2 – Antze, Oskar – 1-0 – Saemisch, Friedrich – G6 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. d3 O-O 7. O-O h6 8. Nd5 Be6 9. Ne1 Bxd5 10. cxd5 Ne7
1927 Bremen – Round 1 – Carls, Carl – 1/2-1/2 – Bogoljubow, Efim – G1 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. d3 d6 6. Bg2 O-O 7. O-O h6 8. Bd2 Qe7 9. Rc1 a6 10. e4 Bg4
1933 Folkestone ol (Men) – Round 2.1 – Mikenas, Vladas – 1/2-1/2 – Andersen, Erik – G1 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. d3 Bd7 8. Nd5 Nxd5 9. cxd5 Ne7 10. d4 exd4
1956 Candidats Tournament – Round 8 – Filip, Miroslav – 1/2-1/2 – Keres, Paul Petrovich – G34 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 O-O 6. O-O d6 7. d3 Be6 8. a3 a5 9. Bg5 h6 10. Bh4 Nd4
1961 URS-ch29 sf Novgorod – Round 2 – Savon, Vladimir – 1/2-1/2 – Veresov, Gavriil – G1 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. d3 Re8 8. a3 a6 9. b4 Ba7 10. Bd2 h6
1965 ARG Ch – Round 8 – Behrensen, Jorge – 0-1 – Rodriguez, Alberto – G5 1. c4 e5 2. Nc3 Nf6 3. g3 Bc5 4. Bg2 O-O 5. Nf3 Nc6 6. O-O d6 7. d3 h6 8. a3 a5 9. e3 Ba7 10. Rb1 Be6
1965 Buenos Aires ch-ARG – Round 6 – Behrensen, Jorge – 1-0 – Aguilar Luna, Santiago – G42 1. c4 Nf6 2. Nc3 e5 3. g3 Bc5 4. Bg2 Nc6 5. Nf3 d6 6. d3 O-O 7. O-O h6 8. Ne1 Be6 9. Nd5 Nh7 10. Nc2 a5
1972 Skopje ol (Men) fin-A – Round 4 – Ghitescu, Theodor – 0-1 – Liljedahl, Lennart – G34 1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. g3 Bc5 5. d3 d6 6. Bg2 O-O 7. O-O Re8 8. Na4 a6 9. Nxc5 dxc5 10. b3 Nd7
2. London Chess Classic 2010 – Round 2 – Carlsen, Magnus – 1-0 – Adams, Michael – G3 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. d3 a6 8. a3 Ba7 9. b4 Be6 10. Nd2 Rb8
40. Olympiad Open 2012 – Round 3.13 – Miezis, Normunds – 1/2-1/2 – Grischuk, Alexander – G165 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. d3 h6 8. a3 a6 9. b4 Ba7 10. Bb2 Re8
6. World Blitz 2010 – Round 21.2 – Grischuk, Alexander – 1/2-1/2 – Movsesian, Sergei – G150 1. c4 e5 2. g3 Nc6 3. Bg2 Bc5 4. Nc3 Nf6 5. Nf3 d6 6. O-O O-O 7. d3 h6 8. a3 a6 9. b4 Ba7 10. Bb2 Bg4
Investbanka 1997 – Round 9 – Gelfand, Boris – 1/2-1/2 – Anand, Viswanathan – G24 1. c4 e5 2. g3 Nf6 3. Bg2 Nc6 4. Nf3 Bc5 5. O-O d6 6. Nc3 O-O 7. d3 h6 8. a3 a5 9. b3 Nd4 10. Ne1 c6
Madrid 1994 – Round 1 – Illescas Cordoba, Miguel – 1/2-1/2 – Bareev, Evgeny – G1 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 Bc5 5. d3 O-O 6. Bg2 d6 7. O-O a5 8. Bg5 h6 9. Bxf6 Qxf6 10. Ne4 Qe7
Montreal 1979 – Round 8 – Tal, Mikhail – 1-0 – Kavalek, Lubomir – G33 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. d3 h6 8. a3 a6 9. b4 Ba7 10. Bb2 Bf5
World Blitz 2015 – Round 2.74 – Thiede, Lars – 0-1 – Grigoriants, Sergey – G132 1. g3 Nf6 2. Bg2 e5 3. c4 Nc6 4. Nf3 Bc5 5. O-O d6 6. d3 O-O 7. Nc3 h6 8. a3 a6 9. b4 Ba7 10. Bb2 Re8

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