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

abcdefgh

Avantages : case forte e4, case forte b5, case forte d5, paire de fous.
Faiblesses adverses : Bc8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, Bf1 enfermé, arriéré d2, 4 pièces non développées (C1, F1, A1, 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

Avantages : Bb4 actif, paire de fous.
Faiblesses adverses : arriéré d2, Bc1 enfermé, Bf1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, 3 pièces non développées (C8, A8, 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

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

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	● d2	—
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

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