Structure de pions

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

Cases

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

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bf1	● Bf1 Non développé (mob. 2)
Bc8		● Bc8 Non développé (mob. 0)
Bf8		● Bf8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	4 (● c1, ● f1, ● a1, ● h1)	4 (● c8, ● f8, ● 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	mobile
Ruptures	● d2-d4	● …d7-d5

A28l — English: Four Knights, Nenarokov Variation

1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 exd4 5.Nxd4 Bb4 6.Bg5 h6 7.Bh4 Bxc3+ 8.bxc3 Ne5 * ● Trait aux Noirs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plans. Qc2 (Prépare O-O-O — 57 % des parties) ; d4 (Occuper le centre — 17 % des parties) ; Nd5 (Cavalier centralisé en d5 — 6 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plans. ...Bb4 (Clouer c3, Fou actif (mobilité 7), Développer f8 — 66 % des parties) ; ...Be7 (Fou actif (mobilité 5), Développer f8 — 13 % des parties) ; ...d5 (Occuper le centre — 11 % des parties) ; ...d6 (Libérer Bc8 — 6 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Partie
1927 London olm – Round 7 – Kostic, Boris – 1-0 – Krause, Orla Hermann – G30 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 d6 10. Be2 O-O
1934 Leningrad – Round 1 – Levenfish, Grigory – 1/2-1/2 – Botvinnik, Mikhail – G6 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 Ng6 10. Bg3 Ne4
1936 New York ch-USA – Round 6 – Hanauer, Milton Loeb – 0-1 – Reshevsky, Samuel – G15 1. c4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 O-O 10. Be2 Ng6
1937 Prague – Round 6 – Foltys, Jan – 1/2-1/2 – Trifunovic, Petar – G31 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 Ng6 10. Bg3 d6
1940 Moskou ch-URS – Round 1 – Botvinnik, Mikhail – 1-0 – Levenfish, Grigory – G1 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 Ng6 10. Bg3 Ne4
1945 Zlin – Round 9 – Kottnauer, Cenek – 1-0 – Holas, Josef – G6 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. f4 Nxc4 10. e4 Ne3
1947 Stuttgart – Round 1 – Rautenberg, Wilhelm – 1-0 – Saemisch, Friedrich – G1 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 Ng6 10. Bg3 Ne4
1948 Moskou ch-URS – Round 4 – Tolush, Alexander – 1-0 – Furman, Slavomir – G38 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. f4 Ng6 10. Bxf6 Qxf6
1950 URS Ch sf – Round 8 – Kopilov, Nikolay Georgiyevich – 0-1 – Koblencs, Alexander – G6 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. f4 Ng6 10. Bxf6 Qxf6
1951 Toronto Ch finals – Round 1 – Avery, Peter – 0-1 – Anderson, Frank Ross – G1 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 Ng6 10. Bg3 Ne4
1953 Bucharest – Round 1 – Filip, Marius Liviu – 1/2-1/2 – Sajtar, Jaroslav – G1 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. f4 Ng6 10. Bxf6 Qxf6
1956 Leningrad ch-URS – Round 1 – Bivshev, Vasily – 1-0 – Lisitsin, Georgy – G10 1. c4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. f4 Ng6 10. Bxf6 Qxf6
1964 Buenos Aires – Round 13 – Eliskases, Erich – 1/2-1/2 – Wexler, Bernardo – G113 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 Ng6 10. Bg3 Ne4
1964 Clare Benedict Cup 11th – Round 5 – Baumgartner, Heinz – 1-0 – Magrin, Antonio – G24 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 Bxc3+ 7. bxc3 h6 8. Bh4 Ne5 9. f4 Ng6 10. Bxf6 Qxf6
1967 Zierikzee ch-NED – Round 3 – Rosenthal, Max Manuel – 0-1 – Ree, Hans – G21 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 d6 10. f3 O-O
1968 Moscow Ch – Round 1 – Volovich, Anatoly – 0-1 – Averbakh, Yuri L – G1 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 d6 10. Be2 O-O
Las Palmas 1996 – Round 4 – Kramnik, Vladimir – 1/2-1/2 – Karpov, Anatoly – G6 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. f4 Ng6 10. Bxf6 Qxf6
SportAccord Blitz 2014 – Round 15.5 – Ivanchuk, Vasyl – 1-0 – Harikrishna, Pentala – G116 1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. f4 Ng6 10. Bxf6 Qxf6
Tilburg Fontys 1998 – Round 4 – Zvjaginsev, Vadim – 1/2-1/2 – Van Wely, Loek – G10 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. e3 O-O 10. f3 d6
XXIV SuperGM 2007 – Round 6 – Morozevich, Alexander – 1/2-1/2 – Svidler, Peter – G19 1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5 9. f4 Ng6 10. Bxf6 Qxf6

A28l — Four Knights, Nenarokov Variation (1904)

1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 exd4 5.Nxd4 Bb4 6.Bg5 h6 7.Bh4 Bxc3+ 8.bxc3 Ne5

Les coups candidats

9.Bb4 — 66.5% (6453 parties) →

Ambassadeurs : Suba, Mihai (27x), Jørgensen, Brian Jørgen (27x), Moujan, Pablo Miguel (24x), Bishop, William (23x), Banas, Jan (22x), Timman, Jan H (22x), Ellis, James (20x), Bishop, Nicholas (19x)

9.Be7 — 12.9% (1251 parties)

Ambassadeurs : ? (6x), Nei, Iivo (5x), Prandstetter, Eduard (5x), Suba, Mihai (5x), Tompa, Janos (5x), Gavrilov, Alexei (5x), Mikenas, Vladas (4x), Tal, Mikhail (4x)

9.d5 — 10.7% (1041 parties)

Ambassadeurs : Amin, Ashraf (4x), Vaitonis, Povilas (3x), Djabri, Zafer M. (3x), Machlik, Edit (3x), Rusinkevich, Nina (2x), Hoffmann, Michael (2x), Holsapple, Boyd (2x), Gyurkovics, Miklos (2x)

9.d6 — 5.8% (561 parties)

Ambassadeurs : Hohler, Peter (4x), Abel, Peter (4x), Adamski, Jan (3x), Filguth, Rubens Alberto (3x), Hecht, Hans-Joachim (3x), Trois, Francisco R.T. (3x), Suba, Mihai (3x), Harasta, Vladimir (3x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	9.Bb4	9.Be7	9.d5	9.d6
<1800	475	64%	8%	15%	8%
1800-2200	3125	64%	11%	15%	6%
2200-2600	4464	69%	15%	7%	5%
2600+	321	80%	7%	4%	2%

Évolution par décennie (% des parties)

Décennie	N parties	9.Bb4	9.Be7	9.d5	9.d6
1950s	42	24%	31%	31%	7%
1960s	63	56%	19%	8%	16%
1970s	414	65%	13%	6%	12%
1980s	740	59%	22%	9%	8%
1990s	1243	56%	18%	12%	9%
2000s	1724	61%	15%	13%	7%
2010s	3660	71%	10%	10%	5%
2020s	1811	75%	9%	10%	2%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
9.Bb4	71%	75%	▲ +3.5%
9.Be7	10%	9%	▼ -0.9%
9.d5	10%	10%	+0.2%
9.d6	5%	2%	▼ -2.1%

Joueurs célèbres

Champions du monde dans cette position

Karpov, Anatoly — 10 parties
Ding, Liren — 10 parties
Carlsen, Magnus — 6 parties
Kasparov, Garry — 5 parties
Tal, Mikhail — 5 parties
Anand, Viswanathan — 5 parties
Smyslov, Vladimir — 1 partie
Hou, Yifan — 1 partie
Ju, Wenjun — 1 partie

Parties historiques

9.Bb4 — 66.5% (6453 parties)

1951 — Heinicke, Herbert vs Bogoljubow, Efim — 0-1 — Augsburg GER
1952 — Filip, Miroslav vs Potucek, Ludovit — 1-0 — Tatranska ch CZE
1953 — Borodin, Vladimir vs Lemaire, Robert — 0-1 — Antwerp BEL
1954 — Antonio Molina, Zayra Angelina vs Tikovsky, Augustin — 0-1 — Jablonec nad Nisou
1957 — Feuerstein, Arthur vs Elter, Sophia — 1/2-1/2 — New York, NY USA

9.Be7 — 12.9% (1251 parties)

1950 — Mikenas, Vladas vs Keres, Paul — 0-1 — Moskou ch-URS
1950 — Smyslov, Vasily vs Mikenas, Vladas — 1-0 — Moskou ch-URS
1952 — Ilivitsky, Georgy A vs Bannik, Anatolij — 1/2-1/2 — Riga LAT
1952 — Nei, Iivo vs Mikenas, Vladas — 1/2-1/2 — Riga LAT
1955 — Filchev, Rusko vs Gasharov, Nikola — 1-0 — Sofia BUL

9.d5 — 10.7% (1041 parties)

1951 — Vaitonis, Povilas vs Yerhoff, Frank — 1-0 — Vancouver
1951 — Sandrin, Albert vs Donovan, Jeremiah — 0-1 — Forth Worth
1952 — Ilivitsky, Georgy A vs Chestnov, Vitaliy A. — 1/2-1/2 — Riga LAT
1954 — Rusinkevich, Nina vs Tikhomirova, Vera N — 1/2-1/2 — ?
1954 — Dolezal, Jiri vs Parak, Frantisek — 1-0 — Prague CZE

9.d6 — 5.8% (561 parties)

1954 — Anay Barche vs Pfeiffer, Gerhard — 0-1 — Amsterdam olm
1955 — Martins, Poul vs Madsen, Eigil — 0-1 — Esbjerg DEN
1959 — Pachman, Ludek vs Ivan, Imrich — 1-0 — Bratislava SVK
1960 — Seleznev, Valentin vs Yuan, Zhilin — 1/2-1/2 — Perm RUS
1960 — Doda, Zbigniew vs Witkowski, Stefan — 1-0 — Poland ch

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