A28i — English: Four Knights, 4.e3 Bb4 5.Qc2

1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3 Bb4 5.Qc2 * ● Trait aux Noirs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Atouts. Les Blancs s'appuient sur les cases fortes e4, b5 et d5 et la paire de fous.

Côté adverse. Le fou enfermé en c8 et le roi resté au centre.

En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (les fous c1 et f1 et les tours a1 et h1).

Plans. O-O (Mettre le roi en sécurité, connecter les tours) ; d3 (Libérer Bc1) ; Bd3 (Développer Bf1) ; h3 (Empêcher ...Bg4).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Atouts. Les Noirs s'appuient sur un fou actif en b4 et la paire de fous.

Côté adverse. Les fous enfermés en c1 et f1 et le roi resté au centre.

En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (le fou c8 et les tours a8 et h8).

Plans. O-O (Mettre le roi en sécurité, connecter les tours) ; ...d6 (Libérer Bc8) ; ...Bg4 (Clouer Nf3) ; ...d5 (Rupture) ; ...e4 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● d2→e3, f2→e3	—
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e4 (2v1), ● b5 (2v0), ● d5 (2v1)	—
Cases faibles	—	—
Centre	● d5 (2v1), ● e4 (2v1)	—

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bf1	● Bf1 Non développé (mob. 2)
Bb4		● Bb4 Actif (mob. 7)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	4 (c1, f1, a1, h1)	3 (c8, a8, h8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Au centre !	● Au centre !
Droits de roque	O-O / O-O-O	O-O / O-O-O

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	semi-ouvert
Ruptures	● c4-c5, ● d2-d3, ● e3-e4	● …d7-d6, ● …d7-d5, ● …e5-e4

Partie
? 2000 – Round ? – Dos Reis, Pollyana Goncalves – 0-1 – Avrukh, Boris – G4 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Be7 7. a3 d6 8. Nxe7+ Qxe7 9. d3 a5 10. b3 d5
1935 Warsaw olm – Round 7 – Pirc, Vasja – 0-1 – Lilienthal, Andor – G21 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Be7 7. a3 d6 8. Be2 Nxd5 9. cxd5 Nb8 10. b4 Nd7
1936 Nottingham – Round 1 – Flohr, Salo – 1/2-1/2 – Fine, Reuben – G8 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Be2 Re8 7. O-O d6 8. Ne1 Be6 9. a3 Bxc3 10. Qxc3 a5
1951 Augsburg – Round 3 – Heinicke, Herbert – 0-1 – Bogoljubow, Efim – G15 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. d3 Re8 7. Bd2 d5 8. cxd5 Nxd5 9. a3 Bf8 10. Be2 Nf6
1952 Tatranska ch CZE – Round 6 – Filip, Miroslav – 1-0 – Potucek, Ludovit – G16 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Be2 Re8 7. O-O e4 8. Ne1 Bxc3 9. bxc3 Qe7 10. f3 b6
1957 Manhattan CC Ch 5657 fin – Round 5 – Feuerstein, Arthur – 1/2-1/2 – Shipman, Walter – G14 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. a3 Bxc3 7. Qxc3 Re8 8. d3 d5 9. cxd5 Qxd5 10. Be2 e4
1958 HUN Ch 13th – Round 19 – Barcza, Gedeon – 1/2-1/2 – Szily, Jozsef – G158 1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e3 Bb4 5. Qc2 O-O 6. d3 Re8 7. Bd2 Bf8 8. Be2 d5 9. cxd5 Nb4 10. Qb3 Nbxd5
1960 Buenos Aires ch-ARG – Round 15 – Benko, Francisco – 1-0 – Espinosa Flores, Rafael Emilio – G104 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Be7 7. a3 d6 8. Be2 Nxd5 9. cxd5 Nb8 10. d4 Nd7
1961 Warsaw – Round 1 – Lengyel, Laszlo – 1-0 – Zinn, Lothar – G2 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. d3 d5 7. cxd5 Nxd5 8. a3 Nxc3 9. bxc3 Bd6 10. d4 Bg4
1964 Capablanca Memorial – Round 17 – Bielicki, Carlos – 0-1 – Smyslov, Vasily – G166 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. b3 Bxc3 7. Qxc3 Re8 8. d3 d5 9. cxd5 Qxd5 10. Be2 e4
1964 Capablanca Memorial – Round 17 – Bielicki, Carlos – 0-1 – Smyslov, Vladimir – G167 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. a3 Bxc3 7. Qxc3 Re8 8. d3 d5 9. cxd5 Qxd5 10. Be2 e4
1965 Leipzig Inter-1 – Round 6 – Barcza, Gedeon – 1/2-1/2 – Liebert, Heinz – G21 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Re8 7. a3 Bf8 8. d3 d6 9. Nc3 a5 10. Be2 Bf5
1965 Tallinn ch-URS – Round 1 – Bukhman, Eduard – 1-0 – Sakharov, Yuri G. – G10 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Re8 7. Bd3 h6 8. O-O Bf8 9. a3 a5 10. Nxf6+ Qxf6
1965 Tallinn ch-URS – Round 1 – Mikenas, Vladas – 1-0 – Sakharov, Yuri G. – G11 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Re8 7. Nxb4 Nxb4 8. Qb3 a5 9. d3 d5 10. a3 Na6
1967 Rubinstein Memorial – Round 3 – Doda, Zbigniew – 1/2-1/2 – Flohr, Salo – G11 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Be2 Re8 7. d3 d5 8. cxd5 Nxd5 9. O-O Nf6 10. Bd2 Bg4
1968 Reggio Emilia – Round 9 – Ghitescu, Theodor – 1/2-1/2 – Paoli, Enrico – G12 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. d3 d5 7. cxd5 Nxd5 8. a3 Be7 9. Bd2 a5 10. Be2 Nb6
1972 Skopje ol (Men) fin-A – Round 1 – Garcia Rodriguez, Raimundo – 0-1 – Malich, Burkhard, Dr. – G40 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. d3 Re8 7. Bd2 Bf8 8. Be2 d6 9. O-O h6 10. Rfd1 Bf5
1972 Skopje ol (Men) fin-A – Round 11 – Malich, Burkhard, Dr. – 1/2-1/2 – Smejkal, Jan – G32 1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e3 Bb4 5. Qc2 O-O 6. d3 Re8 7. Bd2 Bxc3 8. Bxc3 d5 9. cxd5 Nxd5 10. Be2 Bf5
1972 Skopje ol (Men) fin-A – Round 4 – Darga, Klaus – 1/2-1/2 – Uhlmann, Wolfgang – G41 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. d3 Re8 7. Bd2 Bf8 8. Be2 d6 9. O-O h6 10. a3 Bf5
1975 Portoroz/Ljubljana – Round 7 – Ribli, Zoltan – 1/2-1/2 – Portisch, Lajos – G4 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. d3 Re8 7. Bd2 d6 8. Be2 Bf5 9. Ne4 Bxe4 10. dxe4 Bxd2+
40. Olympiad Open 2012 – Round 3.3 – Rodgaard, John – 0-1 – Mamedov, Rauf – G191 1. c4 e5 2. Nc3 Nc6 3. e3 Nf6 4. Nf3 Bb4 5. Qc2 O-O 6. d3 d5 7. cxd5 Nxd5 8. Be2 Be7 9. a3 Kh8 10. Nxd5 Qxd5
43. Olympiad 2018 – Round 11.5 – Laznicka, Viktor – 1/2-1/2 – Eljanov, Pavel – G749 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Be7 7. a3 d6 8. Ng5 g6 9. Nxe7+ Qxe7 10. d3 Ng4
Amber-blindfold 02nd 1993 – Round 4 – Ljubojevic, Ljubomir – 1/2-1/2 – Anand, Viswanathan – G2 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Re8 7. Bd3 g6 8. a3 Bf8 9. Rb1 Bg7 10. b4 d6
Hoogovens 1978 – Round 1 – Miles, Anthony J – 1/2-1/2 – Portisch, Lajos – G3 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 a5 7. a3 Be7 8. d4 exd4 9. exd4 Re8 10. Be3 Bf8
Linares 1993 – Round 9 – Ljubojevic, Ljubomir – 0-1 – Karpov, Anatoly – G35 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Re8 7. Bd3 g6 8. Nxf6+ Qxf6 9. a3 Bf8 10. Be4 d6
Lindores Abbey Tal Memorial 2021 – Round 3.8 – Howell, David W L – 1-0 – Maghsoodloo, Parham – G166 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Be7 7. a3 d6 8. Nxe7+ Qxe7 9. d3 a5 10. b3 d5
Moskou ch-URS 1973 – Round 11 – Smyslov, Vassily – 0-1 – Kuzmin, Gennadi – G70 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. d3 Re8 7. Bd2 Bxc3 8. Bxc3 d5 9. cxd5 Nxd5 10. Be2 Qd6
OHRA 1988 – Round 1 – Korchnoi, Viktor – 0-1 – Nikolic, Predrag – G2 1. c4 e5 2. Nc3 Nc6 3. e3 Nf6 4. Nf3 Bb4 5. Qc2 O-O 6. Nd5 Re8 7. a3 Bf8 8. Bd3 g6 9. O-O Bg7 10. Nxf6+ Qxf6
PCA Qualifiers 1993 – Round 8 – Ljubojevic, Ljubomir – 0-1 – Illescas Cordoba, Miguel – G142 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. d3 Re8 7. a3 Bxc3+ 8. Qxc3 d5 9. cxd5 Qxd5 10. e4 Qd6
Petropolis Interzonal 1973 – Round 10 – Panno, Oscar – 1/2-1/2 – Portisch, Lajos – G37 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. d3 Re8 7. Bd2 d6 8. Be2 Bf5 9. O-O e4 10. Ne1 Bg6
Siegen olm 1970 – Round 12 – Bobotsov, Milko G – 0-1 – Portisch, Lajos – G19 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Be2 Re8 7. O-O e4 8. Nd4 Nxd4 9. exd4 d5 10. cxd5 Bf5
Turin ol (Men) 37th 2006 – Round 10 – Nogueiras Santiago, Jesus – 1/2-1/2 – Harikrishna, Pentala – G124 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 Qe7 6. Nd5 Nxd5 7. cxd5 e4 8. Ng1 Nb8 9. Qxc7 O-O 10. Qc2 b6
World Blitz 2017 – Round 11.14 – Cheparinov, Ivan – 1/2-1/2 – Kryvoruchko, Yuriy – G555 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Be7 7. a3 d6 8. Be2 Be6 9. Ng5 Bxd5 10. cxd5 Nb8
World Blitz 2017 – Round 5.48 – Ganguly, Surya Shekhar – 0-1 – Khismatullin, Denis – G274 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 d6 6. d3 O-O 7. Be2 a6 8. O-O Bc5 9. a3 Ba7 10. b4 Ne7
World Blitz 2018 – Round 12.25 – Inarkiev, Ernesto – 1-0 – Kevlishvili, Robby – G708 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 d6 6. Nd5 Nxd5 7. cxd5 O-O 8. dxc6 bxc6 9. Be2 Rb8 10. O-O Bc5
World Blitz 2019 – Round 1.50 – Harsha Bharathakoti – 0-1 – Firouzja, Alireza – G44 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 d6 6. Ne2 O-O 7. a3 Ba5 8. Ng3 Re8 9. Bd3 Qe7 10. Ne4 g6

A28i — Four Knights

1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3 Bb4 5.Qc2

Eval: [-0.04]

Les coups candidats

5…Bxc3 — 49.6% (2729 parties) →

Ambassadeurs : Hassim, Unes (21x), Tsenkov, Ljubomir (20x), Ellis, James R (20x), Jørgensen, Brian Jørgen (19x), Bishop, William (18x), Suba, Mihai (17x), Lanzani, Paolo (17x), Esin, Maxim (16x)

5…O-O — 40.9% (2249 parties)

Ambassadeurs : Van Deursen, Peter (10x), Linqvist, Grels (10x), Vötter, Hans-Dieter (10x), Miles, Anthony J (9x), Portisch, Lajos (8x), Jeske, Eckhard (8x), Bishop, Nicholas (8x), Timman, Jan H (8x)

5…d6 — 7.9% (437 parties)

Ambassadeurs : von Buttlar, Paul (4x), Lanzani, Paolo (4x), Sodomski, Andrzej (4x), Mareco, Sandro (4x), Harsha Bharathakoti (4x), Almeraya, Eduardo (4x), Timman, Jan H (4x), Stohl, Igor (3x)

5…a5 — 1.1% (60 parties)

Ambassadeurs : Fyllingen, Roy Harald (2x), Jovic, Stanoje (2x), Grunberg, Mihai-Lucian (2x), Petersons, Indulis (2x), Homa, Seth (2x), Stremavicius, Titas (2x), Savon, Vladimir A (1x), Anikaev, Yuri N (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	5…Bxc3	5…O-O	5…d6	5…a5
<1800	94	34%	50%	14%	1%
1800-2200	1353	45%	44%	8%	1%
2200-2600	3072	54%	37%	7%	1%
2600+	245	70%	20%	8%	1%

Évolution par décennie (% des parties)

Décennie	N parties	5…Bxc3	5…O-O	5…d6	5…a5
1880s	1	100%	—	—	—
1930s	2	—	100%	—	—
1950s	6	—	100%	—	—
1960s	17	18%	82%	—	—
1970s	240	20%	71%	8%	1%
1980s	361	43%	52%	4%	1%
1990s	525	36%	57%	6%	1%
2000s	876	40%	49%	9%	1%
2010s	2355	54%	35%	10%	1%
2020s	1121	64%	29%	5%	2%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
5…Bxc3	54%	64%	▲ +10.6%
5…O-O	35%	29%	▼ -6.4%
5…d6	10%	5%	▼ -4.9%
5…a5	1%	2%	+0.4%

Joueurs célèbres

Champions du monde dans cette position

Smyslov, Vladimir — 10 parties
Ding, Liren — 7 parties
Kasparov, Garry — 4 parties
Karpov, Anatoly — 4 parties
Karpov, Aleksandr — 3 parties
Anand, Viswanathan — 2 parties
Carlsen, Magnus — 2 parties
Tal, Mikhail — 1 partie
Hou, Yifan — 1 partie
Ju, Wenjun — 1 partie

Parties historiques

5…Bxc3 — 49.6% (2729 parties)

1883 — McKenzie, George vs Rosenthal, Samuel — 1/2-1/2 — London ENG
1965 — Antoshin, Vladimir S vs Flohr, Salo — 1/2-1/2 — Sochi RUS
1965 — Poder, Walter vs Preo, Nicolas A — 0-1 — ?
1968 — Poder, William vs Preo, Nicolas A — 0-1 — CCOL5 fin 6568
1974 — Polugaevsky, Lev vs Matanovic, Aleksandar — 1/2-1/2 — Belgrade-Moscow

5…O-O — 40.9% (2249 parties)

1935 — Pirc, Vasja vs Lilienthal, Andor — 0-1 — Warsaw POL
1936 — Flohr, Salo vs Fine, Reuben — 1/2-1/2 — Nottingham ENG
1951 — Heinicke, Herbert vs Bogoljubow, Efim — 0-1 — Augsburg GER
1952 — Filip, Miroslav vs Potucek, Ludovit — 1-0 — Tatranska Lomnica
1954 — Zaruba, Antonin vs Tikovsky, Augustin — 0-1 — Jablonec nad Nisou

5…d6 — 7.9% (437 parties)

1973 — Deleyn, Gunter vs Diesen, Mark C — 1/2-1/2 — Schilde
1974 — Langeweg, Kick vs Timman, Jan H — 1/2-1/2 — Wijk aan Zee NED
1975 — Eising, Johannes vs Enklaar, Bert — 1-0 — Amsterdam NED
1977 — Adamski, Jan vs Kholmov, Ratmir D — 1/2-1/2 — Zala Cup Zalaegerszeg
1977 — Korchnoi, Viktor vs Timman, Jan H — 1-0 — Leeuwarden ch-NED

5…a5 — 1.1% (60 parties)

1976 — Tangborn, Eric vs Brown, Paul — 1-0 — Gresham
1979 — Savon, Vladimir A vs Anikaev, Yuri N — 1-0 — Suomi
1980 — Landsman, Klaas vs Ramaekers, Philippe — 1-0 — Dieren NED
1982 — Santa Torres, Juan M. vs Juarez Flores, Carlos A. — 0-1 — Lucerne SUI
1990 — Derikum, Axel vs Messmer, Martin — 1/2-1/2 — GER

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