A29x — English: Four Knights, 4.g3 d5 5.cxd5 Nxd5 6.Bg2 Nb6 7.O-O Be7 8.Rb1

1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3 d5 5.cxd5 Nxd5 6.Bg2 Nb6 7.O-O Be7 8.Rb1 * ● Trait aux Noirs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : majorité centre (2v1), paire de fous, colonne c.
Faiblesses adverses : Bc8 enfermé, roi noir au centre.
Problèmes : Bc1 enfermé, Bg2 enfermé.
Plans :
● d3 — Libérer Bc1
● h3 — Empêcher ...Bg4
● Rc — Tour sur colonne c

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : majorité aile_dame (3v2), case forte b4, case forte d4, case forte d5, Be7 actif, paire de fous, colonne d.
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
● ...e4 — Rupture
● ...f6 — Rupture
● ...f5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

A29x — Four Knights

1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3 d5 5.cxd5 Nxd5 6.Bg2 Nb6 7.O-O Be7 8.Rb1

Eval: [+0.12]

Les coups candidats

8…a5 — 49.7% (548 parties)

Ambassadeurs : Bartsch, Reinhard Andrea (9x), Zhak, Boris (7x), Farias, Sergio Roberto Alves (6x), Czebe, Attila (5x), Romanishin, Oleg M (5x), Karjakin, Sergey (5x), Salzmann, Stefan (5x), Sarno, Spartaco (4x)

8…O-O — 28.2% (311 parties)

Ambassadeurs : Zhak, Boris (6x), Scherer, Max (5x), Azmaiparashvili, Zurab (3x), Miezis, Normunds (3x), Morozevich, Alexander (3x), Tiviakov, Sergei (3x), Grant, Jonathan I M (3x), Donnenfeld, Patrice (3x)

8…Be6 — 9.3% (103 parties)

Ambassadeurs : Palac, Mladen (4x), Maroroa Jones, Gawain C B (3x), Gurevich, Mikhail (2x), Motzer, Heinrich, Dr. (2x), Romanishin, Oleg M (2x), Abramov, Sergey Pavlovich (2x), Kratochvíl, Jan (2x), Krakovský, Peter (2x)

8…g5 — 6.7% (74 parties)

Ambassadeurs : Karpatchev, Aleksandr (5x), Hector, Jonny (3x), Serper, Grigory (2x), Korchnoi, Viktor (2x), Bareev, Evgeny (2x), Degerman, Lars (2x), Andersen, Daniel (2x), Mickevicius, Juras (2x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	8…a5	8…O-O	8…Be6	8…g5
<1800	5	60%	—	20%	20%
1800-2200	274	47%	34%	9%	5%
2200-2600	681	52%	27%	9%	7%
2600+	71	55%	15%	10%	8%

Évolution par décennie (% des parties)

Décennie	N parties	8…a5	8…O-O	8…Be6	8…g5
1980s	2	—	100%	—	—
1990s	163	29%	40%	9%	9%
2000s	250	38%	38%	8%	11%
2010s	556	56%	23%	12%	5%
2020s	131	75%	14%	4%	2%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
8…a5	56%	75%	▲ +19.2%
8…O-O	23%	14%	▼ -9.6%
8…Be6	12%	4%	▼ -7.9%
8…g5	5%	2%	▼ -2.9%

Joueurs célèbres

Champions du monde dans cette position

Kasparov, Garry — 2 parties
Ding, Liren — 1 partie
Kramnik, Vladimir — 1 partie

Parties historiques

8…a5 — 49.7% (548 parties)

1992 — Adorjan, Andras vs Cebalo, Miso — 1/2-1/2 — Polanica Zdroj POL
1993 — Hansen, Lars Bo vs Romanishin, Oleg M — 1/2-1/2 — Polanica Zdroj POL
1993 — Kamp, Christoph vs Lanzendoerfer, Johannes — 1/2-1/2 — GER-ch qgA17 9395
1993 — Jeute, Volkmar Peter vs Pampa, Andreas — 1-0 — Germany ch-32 prel-17 9395
1993 — Pevzner, Albert vs Schwartzman, Gabriel — 0-1 — Groningen NED

8…O-O — 28.2% (311 parties)

1984 — Hjorth, Gunnar vs Morovic Fernandez, Ivan — 1/2-1/2 — Thessaloniki GRE
1989 — Shirazi, Kamran vs Benjamin, Joel — 1-0 — Philadelphia, PA USA
1991 — Sorokin, Maksim vs Savon, Vladimir — 1/2-1/2 — Chelyabinsk RUS
1991 — Shvedchikov, Anatoli I. vs Olbrich, Joachim — 1-0 — Moscow RUS
1992 — Adorjan, Andras vs Lin, Weiguo — 0-1 — Shenzhen

8…Be6 — 9.3% (103 parties)

1991 — Adorjan, Andras vs Acevedo Sanchez, Jose Ignacio — 1-0 — Manila PHI
1993 — Anderson, Gordon M vs Poppe, Mia — 1/2-1/2 — ?
1993 — Hodgson, Jeremy K vs Romanishin, Oleg M — 1/2-1/2 — Belgrade SRB
1993 — Hodgson, Julian M vs Romanishin, Oleg M — 1/2-1/2 — Belgrade SRB
1994 — Baginskaite, Kamile vs Erneste, Inguna — 1/2-1/2 — GER

8…g5 — 6.7% (74 parties)

1993 — Serper, Grigory vs Korchnoi, Viktor — 0-1 — Groningen NED
1993 — Hodgson, Julian M vs Bareev, Evgeny — 1/2-1/2 — Belgrade SRB
1993 — Hodgson, Jeremy K vs Bareev, Evgeny — 1/2-1/2 — Belgrade SRB
1993 — Curtacci, Sergio vs Baumgartner, Walter — 1/2-1/2 — cr.
1993 — Serper, Grigory vs Korchnoi, Viktor — 0-1 — Groningen NED

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→g3, h2→g3	—
Passés	—	—
Majorité	● centre 2v1	● aile_dame 3v2

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	● b4 (2v0), ● d4 (3v1), ● d5 (2v1)
Cases faibles	—	—
Centre	● e4 (1v0)	● d4 (3v1), ● d5 (2v1)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● c	● d

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bg2	● Bg2 Enfermé (mob. 2)
Be7		● Be7 Actif (mob. 8)
Bc8		● Bc8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	1 (c1)	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	● …e5-e4, ● …f7-f6, ● …f7-f5

Partie
4. Sinquefield Cup 2016 – Round 5.3 – Giri, Anish – 1/2-1/2 – Aronian, Levon – G23 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. Be3 Be6
4. World Blitz 2008 – Round 5 – Gelfand, Boris – 0-1 – Svidler, Peter – G29 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 O-O 9. b4 Nxb4 10. Nxe5 c6
42. Olympiad 2016 – Round 8.3 – Maroroa Jones, Gawain C B – 1/2-1/2 – Vidit, Santosh Gujrathi – G578 1. c4 e5 2. Nc3 Nf6 3. g3 d5 4. cxd5 Nxd5 5. Bg2 Nb6 6. Nf3 Nc6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. Be3 Be6
Corus 2001 – Round 11 – Kasparov, Garry – 1-0 – Timman, Jan H – G68 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 O-O 9. b4 Nxb4 10. Nxe5 c6
Corus A 2007 – Round 9 – Aronian, Levon – 1/2-1/2 – Topalov, Veselin – G54 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 a5 9. d3 Be6 10. Be3 O-O
FIDE GP 2002 – Round 4.2 – Lautier, Joel – 1-0 – Zhu, Chen – G83 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 O-O 9. b4 Bf5 10. b5 Nd4
FIDE WCh KO 2000 – Round 4.3 – Gulko, Boris – 1/2-1/2 – Bareev, Evgeny – G117 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. b3 Be6
FIDE World Cup 2025 – Round R2 Rapid 2 – Shant Sargsyan – 1-0 – Cori Quispe Kevin Joel – G401 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. d3 d6 6. c3 a5 7. Bb3 h6 8. Nbd2 O-O 9. h3 Be6 10. Bc2 d5
GCT Blitz Paris 2016 – Round 2.4 – Nakamura, Hikaru – 1/2-1/2 – Vachier-Lagrave, Maxime – G9 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. Be3 Be6
GCT Blitz Paris 2016 – Round 9.3 – Topalov, Veselin – 1-0 – Vachier-Lagrave, Maxime – G43 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nc3 Nb6 6. Nf3 Nc6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. Be3 Be6
GCT Blitz Paris 2017 – Round 8.3 – Karjakin, Sergey – 1-0 – Vachier-Lagrave, Maxime – G38 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. Nc3 Be7 8. Rb1 a5 9. d3 O-O 10. Be3 Be6
GCT Rapid Paris 2016 – Round 2.4 – Nakamura, Hikaru – 1-0 – Topalov, Veselin – G9 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. a3 Be6
GCT Rapid Paris 2017 – Round 7.4 – So, Wesley – 1/2-1/2 – Topalov, Veselin – G34 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 a5 9. d3 Be6 10. Be3 O-O
GCT Rapid Paris 2017 – Round 9.4 – So, Wesley – 0-1 – Karjakin, Sergey – G44 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. Be3 Be6
Interpolis 1993 – Round 1 – Kostov, Kosta Georgiev – 1/2-1/2 – Morozevich, Alexander – G6 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 O-O 9. b4 a6 10. a4 Nxb4
Interpolis 1993 – Round 1.1 – Korchnoi, Viktor – 1-0 – Stohl, Igor – G63 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 f6 9. d3 Be6 10. a3 O-O
Masters 2000 – Round 6 – Bareev, Evgeny – 1-0 – Rublevsky, Sergei – G20 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 a5 9. b3 O-O 10. Bb2 Be6
PCA Qualifiers 1993 – Round 2 – Hodgson, Julian M – 1-0 – Polgar, Susan – G21 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 f6 9. b4 Nxb4 10. d4 Nc6
PCA Qualifiers 1993 – Round 5 – Serper, Grigory – 1/2-1/2 – Granda Zuniga, Julio E – G83 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nc3 Nb6 6. Nf3 Nc6 7. O-O Be7 8. Rb1 f6 9. d3 Be6 10. a3 O-O
Tata Steel Chess 2025 – Round 7 – Giri Anish – 1/2-1/2 – Abdusattorov Nodirbek – G39 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. O-O Nb6 7. Nc3 Be7 8. Rb1 O-O 9. b4 f6 10. d3 Be6
TCh-RUS 2005 – Round 11 – Aronian, Levon – 1/2-1/2 – Khalifman, Alexander – G174 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 f6 9. d3 Be6 10. a3 O-O
World Blitz 2015 – Round 4.23 – Karjakin, Sergey – 1-0 – Safarli, Elmir – G225 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. Be3 Be6
World Blitz 2016 – Round 3.2 – Bosiocic, Marin – 0-1 – Karjakin, Sergey – G106 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nc3 Nb6 6. Nf3 Nc6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. Be3 Be6
World Rapid 2016 – Round 11.53 – Bosiocic, Marin – 1-0 – Kozul, Zdenko – G439 1. c4 Nf6 2. Nc3 e5 3. g3 d5 4. cxd5 Nxd5 5. Bg2 Nb6 6. Nf3 Nc6 7. O-O Be7 8. Rb1 a5 9. d3 O-O 10. Be3 Be6

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