A29o — 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 * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte b5, case forte d5, paire de fous.
Faiblesses adverses : Bc8 enfermé.
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 b4, case forte d4, case forte g4, case forte e5, avant-poste 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

A29o — Four Knights

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

Eval: [+0.26]

Les coups candidats

7.d3 — 67.9% (1565 parties) →

Ambassadeurs : Beck, Georges (14x), McKlveen, Paul (10x), Wolter, Uwe (10x), Morley, Paul (10x), Zielinski, Sergej (10x), Semmelroth, Heinz-Dieter (9x), Vujadinovic, Milan (8x), Vetter, Udo (8x)

7.e3 — 17.3% (399 parties)

Ambassadeurs : Uhlmann, Wolfgang (10x), Kleinsorgen, Horst (7x), Moman, Aaron (4x), Smits, Mark (4x), Stocek, Jiri (4x), Bartsch, Reinhard Andrea (4x), Schandorff, Lars (3x), Vujadinovic, Milan (3x)

7.a3 — 9.4% (216 parties)

Ambassadeurs : Corominas Garrido, Jordi (3x), Holsapple, Boyd (2x), Berg, Emanuel (2x), Hisker Frank (2x), Smit, Frans P. (2x), Cornelisse, John (2x), Lamard, Guillaume (2x), Bartsch, Reinhard Andrea (2x)

7.Na4 — 2.8% (65 parties)

Ambassadeurs : Pachman, Ludek (1x), Darga, Klaus (1x), Sokolov, Vladimir (1x), Nikolic, Stanimir (1x), Johansen de Moura Iridio (1x), Cavalli Jorge Luiz (1x), Jarosz Jr, Stanley (1x), Fletcher, Gerald D (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	7.d3	7.e3	7.a3	7.Na4
<1800	111	70%	12%	12%	5%
1800-2200	769	68%	14%	11%	4%
2200-2600	710	67%	23%	7%	1%
2600+	50	62%	34%	2%	2%

Évolution par décennie (% des parties)

Décennie	N parties	7.d3	7.e3	7.a3	7.Na4
1900s	1	100%	—	—	—
1920s	1	—	—	100%	—
1930s	2	50%	50%	—	—
1940s	1	—	—	—	—
1950s	3	67%	—	33%	—
1960s	9	33%	11%	33%	22%
1970s	21	62%	24%	10%	—
1980s	43	53%	23%	12%	9%
1990s	331	67%	18%	9%	4%
2000s	707	73%	13%	9%	2%
2010s	1038	70%	17%	9%	3%
2020s	147	42%	42%	10%	3%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
7.d3	70%	42%	▼ -27.8%
7.e3	17%	42%	▲ +25.6%
7.a3	9%	10%	▲ +0.8%
7.Na4	3%	3%	+0.2%

Joueurs célèbres

Champions du monde dans cette position

Karpov, Anatoly — 5 parties
Karpov, Aleksandr — 4 parties
Euwe, Max — 1 partie
Tal, Mikhail — 1 partie
Anand, Viswanathan — 1 partie
Carlsen, Magnus — 1 partie

Parties historiques

7.d3 — 67.9% (1565 parties)

1906 — Curt, Elmin vs Raubitschek, Robert — 1/2-1/2 — Trenton Falls
1933 — Mikenas, Vladas vs Andersen, Erik — 1/2-1/2 — Folkestone ENG
1956 — Filip, Miroslav vs Keres, Paul Petrovich — 1/2-1/2 — Amsterdam NED
1957 — Euwe, Max vs Martin, Edward — 1-0 — New York, NY USA
1961 — Savon, Vladimir vs Veresov, Gavriil — 1/2-1/2 — URS-ch29 sf Novgorod

7.e3 — 17.3% (399 parties)

1937 — Szabo, Laszlo vs Riello, Michele — 1/2-1/2 — Stockholm SWE
1962 — Kostiuchenko, Alexander vs Rostovtsev, Yuri — 1/2-1/2 — ?
1972 — Golz, Werner vs Lorenz, Gerd — 1/2-1/2 — Leipzig GER
1974 — Uhlmann, Wolfgang vs Knaak, Rainer — 0-1 — Halle GER
1974 — Uhlmann, Wolfgang vs Kluger, Gyula — 1-0 — Leipzig GER

7.a3 — 9.4% (216 parties)

1929 — Menchik, Vera vs Lohmann, B.H — 0-1 — Ramsgate /Living Che
1951 — Gondim, Jose Adail vs Salamuni R — 1/2-1/2 — Fortaleza BRA
1961 — Larsen, Benjamin Holsko vs Van den Berg, Cees — 1/2-1/2 — Beverwijk NED
1963 — Collins, Richard Arnold vs Ursell, Philip Ashby — 1-0 — Southampton ENG
1964 — Lengyel, Levente vs Liebert, Heinz — 0-1 — Sinaia

7.Na4 — 2.8% (65 parties)

1961 — Pachman, Ludek vs Darga, Klaus — 1/2-1/2 — Graz AUT
1963 — Sokolov, Vladimir vs Nikolic, Stanimir — 0-1 — Zenica ch YUG
1981 — Holfelder, Hans-Joachim vs Huelsmann, Josef — 1/2-1/2 — GER
1981 — Weindl, Alfred vs Ultch — 0-1 — Peoria Late Fall Tor
1984 — Johansen de Moura Iridio vs Cavalli Jorge Luiz — 1-0 — ?

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

Cases

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

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
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	● d2-d3, ● e2-e3	● …d6-d5, ● …e5-e4

Partie
1937 Stockholm ol (Men) – Round 15 – Szabo, Laszlo – 1/2-1/2 – Riello, Michele – G34 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. e3 a6 8. d4 exd4 9. exd4 Ba7 10. h3 h6
1946 Bad Harzburg – Round 1 – Meynecke, Helmut – 0-1 – Saemisch, Friedrich – G1 1. c4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. Nd5 h6 8. d3 Be6 9. e4 Bg4 10. Ne3 Bxe3
1961 Hoogovens – Round 1 – Larsen, Benjamin Holsko – 1/2-1/2 – Van den Berg, Cees – G1 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 O-O 6. O-O d6 7. a3 a5 8. e3 Bf5 9. d4 Ba7 10. d5 Ne7
1963 Zenica ch YUG – Round 19 – Sokolov, Vladimir – 0-1 – Nikolic, Stanimir – G109 1. Nf3 Nf6 2. g3 Nc6 3. Bg2 e5 4. c4 Bc5 5. Nc3 d6 6. O-O O-O 7. Na4 Re8 8. Nxc5 dxc5 9. d3 Bg4 10. h3 Bf5
1964 EU Team Ch sf – Round 1.3 – Lengyel, Levente – 0-1 – Liebert, Heinz – G6 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 O-O 6. O-O d6 7. a3 a5 8. d3 h6 9. Rb1 Re8 10. Na4 e4
22. ECU Club Cup 2006 – Round 3 – Van Wely, Loek – 1/2-1/2 – Ivanchuk, Vasyl – G43 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. e3 a6 8. a3 Ba7 9. b4 Be6 10. d3 e4
42. Olympiad 2016 – Round 9.19 – Vakhidov, Jakhongir – 1/2-1/2 – Bruzon Batista, Lazaro – G626 1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. e3 Bb6 8. d4 exd4 9. Nxd4 Nxd4 10. exd4 h6
7. Mikhail Tal Memorial 2012 – Round 1 – Grischuk, Alexander – 1-0 – McShane, Luke J – G2 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. e3 a6 8. d4 Ba7 9. h3 Rb8 10. dxe5 Nxe5
Rio de Janeiro Interzonal 1979 – Round 19 – Smejkal, Jan – 1/2-1/2 – Balashov, Yuri S – G59 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. a3 a6 8. e3 Ba7 9. d4 Bg4 10. d5 Ne7
World Blitz 2016 – Round 2.19 – Aditya Tari – 0-1 – Wojtaszek, Radoslaw – G58 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. e3 Bf5 8. b3 Qd7 9. d4 exd4 10. Nxd4 Bh3
World Blitz 2017 – Round 14.44 – Eljanov, Pavel – 1-0 – Tregubov, Pavel V. – G748 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O O-O 7. e3 a6 8. a3 h6 9. b4 Ba7 10. d3 Bf5