A29l — English: Four Knights, 4.g3 Bc5

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

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, 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 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 : roi au centre, Bc8 enfermé, 3 pièces non développées (C8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...Bg4 — Développer Bc8, clouer Nf3
● ...d5 — Rupture
● ...e4 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

A29l — Four Knights

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

Eval: [+0.31]

Les coups candidats

6…O-O — 68.9% (1442 parties) →

Ambassadeurs : McKlveen, Paul (11x), Vujadinovic, Milan (10x), Zielinski, Sergej (9x), Semmelroth, Heinz-Dieter (9x), Beck, Georges (9x), Uhlmann, Wolfgang (8x), Morley, Paul (8x), Wolter, Uwe (7x)

6…a6 — 12.8% (267 parties)

Ambassadeurs : Korneev, Oleg (5x), Mikenas, Vladas (3x), Najer, Evgeniy (3x), Svetushkin, Dmitry (3x), Gulko, Boris (2x), Alburt, Lev (2x), Marin, Mihail (2x), Eyer, Ernst (2x)

6…Be6 — 7.6% (159 parties)

Ambassadeurs : Ferriere, Patrick (2x), Benhamouda, Mathieu (2x), Moldobaev, Erik (2x), Gruber, Sandor (1x), Rethy, Pal (1x), Carleton, Thomas (1x), Martin, Robert D (1x), Hibbeler, Sascha (1x)

6…Bg4 — 4.1% (85 parties)

Ambassadeurs : MrNolan (3x), Sokolsky, Alexey (2x), Ingerslev, Aage (2x), Kotlerman, Samuel (1x), Lisitsin, Georgy (1x), Karmaz P (1x), Hodgson Hoy, Yoidiveth Sheline (1x), Mendes, Silvio Luiz Teixeira (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	6…O-O	6…a6	6…Be6	6…Bg4
<1800	106	65%	2%	20%	6%
1800-2200	661	70%	11%	7%	4%
2200-2600	725	72%	21%	1%	2%
2600+	56	75%	25%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	6…O-O	6…a6	6…Be6	6…Bg4
1920s	2	—	50%	—	—
1930s	5	40%	20%	20%	20%
1940s	4	25%	—	—	25%
1950s	4	25%	25%	—	25%
1960s	9	44%	22%	11%	22%
1970s	23	70%	9%	13%	4%
1980s	42	74%	2%	12%	7%
1990s	304	67%	11%	10%	3%
2000s	601	68%	10%	11%	5%
2010s	953	71%	15%	4%	3%
2020s	145	64%	19%	7%	3%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
6…O-O	71%	64%	▼ -7.0%
6…a6	15%	19%	▲ +4.5%
6…Be6	4%	7%	▲ +2.6%
6…Bg4	3%	3%	-0.0%

Joueurs célèbres

Champions du monde dans cette position

Karpov, Anatoly — 4 parties
Karpov, Aleksandr — 3 parties
Carlsen, Magnus — 2 parties
Euwe, Max — 1 partie
Tal, Mikhail — 1 partie
Anand, Viswanathan — 1 partie

Parties historiques

6…O-O — 68.9% (1442 parties)

1933 — Mikenas, Vladas vs Andersen, Erik — 1/2-1/2 — Folkestone ENG
1937 — Szabo, Laszlo vs Riello, Michele — 1/2-1/2 — Stockholm SWE
1946 — Meynecke, Helmut vs Saemisch, Friedrich — 0-1 — Bad Harzburg
1951 — Gondim, Jose Adail vs Salamuni R — 1/2-1/2 — Fortaleza BRA
1961 — Savon, Vladimir vs Veresov, Gavriil — 1/2-1/2 — URS-ch29 sf Novgorod

6…a6 — 12.8% (267 parties)

1926 — Euwe, Max vs Colle, Edgar — 1-0 — Rotterdam NED
1933 — Kolnhofer, Josef vs Mueller, Hans — 0-1 — Vienna AUT
1958 — Krutyansky, Andrey vs Mikenas, Vladas — 1-0 — Moscow RUS
1961 — Peterson, Andrejs vs Mikenas, Vladas — 1-0 — Palanga
1962 — Kots, Yuri I vs Mikenas, Vladas — 1/2-1/2 — Erevan ch-URS

6…Be6 — 7.6% (159 parties)

1931 — Gruber, Sandor vs Rethy, Pal — 0-1 — Budapest HUN
1967 — Carleton, Thomas vs Martin, Robert D — 1-0 — Ottawa CAN
1975 — Kopczak, L. vs Gotzhein — 1/2-1/2 — corr DDR
1976 — Mann, Gerald vs Krug Cortegoso, Rodolfo Martin — 1-0 — DDR-Cup4 sf09 corr
1976 — Filip, Miroslav vs Packroff, Hermann — 1/2-1/2 — Telc

6…Bg4 — 4.1% (85 parties)

1938 — Lisitsin, Georgy vs Sokolsky, Alexey — 1-0 — Leningrad RUS
1949 — Kotlerman, Samuel vs Sokolsky, Alexey — 0-1 — Odessa UKR
1959 — Moguilevsky M vs Piazzini, Luis — 1-0 — Buenos Aires ARG
1967 — Karmaz P vs Hodgson Hoy, Yoidiveth Sheline — 1-0 — Oxford ch-BCF U16
1968 — Mendes, Silvio Luiz Teixeira vs Pinto Paiva, Jose — 0-1 — Sao Bernardo

	♔ 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)	3 (c8, 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	● …d6-d5, ● …e5-e4

Partie
1931 Budapest – Round 8 – Gruber, Sandor – 0-1 – Rethy, Pal – G47 1. c4 e5 2. Nc3 Nc6 3. g3 Nf6 4. Bg2 Bc5 5. Nf3 d6 6. O-O Be6 7. d3 h6 8. a3 a5 9. Bd2 Qd7 10. Re1 O-O
1933 Trebitsch Memorial 16th – Round 1 – Kolnhofer, Josef – 0-1 – Mueller, Hans – G1 1. c4 e5 2. Nc3 Nf6 3. g3 Nc6 4. Bg2 Bc5 5. Nf3 d6 6. O-O a6 7. d3 O-O 8. Be3 Nd4 9. Qd2 Ng4 10. Bxd4 exd4
1938 URS Ch, semi final – Round 1 – Lisitsin, Georgy – 1-0 – Sokolsky, Alexey – G81 1. Nf3 Nf6 2. c4 Nc6 3. g3 e5 4. Bg2 Bc5 5. O-O d6 6. Nc3 Bg4 7. h3 Bh5 8. g4 Bg6 9. d3 O-O 10. Nh4 Nd7
1943 Prague – Round 14 – Podgorny, Jiri – 1/2-1/2 – Saemisch, Friedrich – G111 1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. g3 Bc5 5. Bg2 d6 6. O-O Bd7 7. d3 h6 8. h3 O-O 9. Kh2 Be6 10. Nd2 d5
1958 WchT U26 fin-B 05th – Round 4 – Olafsson, Fridrik – 1-0 – Mititelu, Gheorghe – G24 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O a5 7. d3 h6 8. a3 O-O 9. h3 Be6 10. e4 Nd4
1961 Palanga Baltic Ch – Round ? – Peterson, Andrejs – 1-0 – Mikenas, Vladas – G4 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O a6 7. d3 h6 8. a3 O-O 9. b4 Ba7 10. Bb2 Bg4
1962 Erevan ch-URS – Round 1 – Kots, Yuri I – 1/2-1/2 – Mikenas, Vladas – G5 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O a6 7. a3 O-O 8. d3 h6 9. b4 Ba7 10. Rb1 Re8
20. European Teams 2015 – Round 1.5 – Maroroa Jones, Gawain C B – 1-0 – Godena, Michele – G38 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O Bf5 7. d3 h6 8. Na4 O-O 9. h3 e4 10. dxe4 Nxe4
7. Mikhail Tal Memorial 2012 – Round 8 – Carlsen, Magnus – 1/2-1/2 – Tomashevsky, Evgeny – G36 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bc5 5. Bg2 d6 6. O-O a6 7. a3 O-O 8. b4 Ba7 9. d3 h6 10. Bb2 Rb8