E21a — Nimzo-Indian: Three Knights

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 * ● Trait aux Noirs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte d4, case forte b5, case forte e5, case forte g5, paire de fous.
Faiblesses adverses : Bc8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, Bf1 enfermé, 4 pièces non développées (C1, F1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● e4 — Centre d4+e4, menace e5, libère Bf1
● Bg5 — Clouer Nf6
● h3 — Empêcher ...Bg4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : Bb4 actif, paire de fous.
Faiblesses adverses : Bc1 enfermé, Bf1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, 4 pièces non développées (B8, C8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...d6 — Libérer Bc8
● ...Nc6 — Développer Nb8
● ...Bg4 — Clouer Nf3
● ...c5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

E21a — Three Knights

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3

Eval: [+0.17]

Les coups candidats

4…b6 — 34.7% (6735 parties) →

Ambassadeurs : Chatalbashev, Boris (38x), Bacrot, Etienne (28x), Kolanek, Roman (26x), Stocek, Jiri (24x), Moiseenko, Alexander (23x), Borisenko, Georgy K (21x), Campos Moreno, Javier B. (19x), Mamedyarov, Shakhriyar (19x)

4…c5 — 29.5% (5721 parties) →

Ambassadeurs : Stocek, Jiri (39x), Borisenko, Georgy K (38x), Farago, Ivan (33x), Bacrot, Etienne (32x), Pinter, Jozsef (31x), Ubilava, Elizbar (27x), Gaprindashvili, Nona (23x), Korchnoi, Viktor (22x)

4…O-O — 18.8% (3651 parties) →

Ambassadeurs : Kolanek, Roman (15x), Habes, Jiri (14x), Chatalbashev, Boris (13x), Mamedyarov, Shakhriyar (13x), Ding, Liren (11x), Batsiashvili, Nino (10x), Voege, Tobias (9x), Rozentalis, Eduardas (9x)

4…d5 — 9.9% (1917 parties) →

Ambassadeurs : Aleksandrov Ivanchev, Aleksandar (12x), Kolanek, Roman (12x), Yu, Yangyi (11x), Dizdar, Goran (10x), Edouard, Romain (9x), Pashikian, Arman (7x), Farago, Ivan (6x), Stocek, Jiri (6x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4…b6	4…c5	4…O-O	4…d5
<1800	571	28%	22%	29%	10%
1800-2200	5026	35%	24%	23%	10%
2200-2600	9002	36%	32%	16%	10%
2600+	1130	37%	32%	13%	14%

Évolution par décennie (% des parties)

Décennie	N parties	4…b6	4…c5	4…O-O	4…d5
1880s	1	100%	—	—	—
1910s	1	—	100%	—	—
1920s	42	40%	17%	14%	2%
1930s	94	47%	9%	12%	4%
1940s	84	46%	6%	26%	6%
1950s	234	29%	38%	18%	7%
1960s	395	28%	41%	20%	7%
1970s	271	27%	50%	13%	4%
1980s	1293	32%	45%	11%	6%
1990s	2455	29%	41%	16%	6%
2000s	5176	34%	35%	16%	8%
2010s	7426	39%	23%	20%	12%
2020s	1913	32%	11%	31%	17%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4…b6	39%	32%	▼ -7.2%
4…c5	23%	11%	▼ -11.3%
4…O-O	20%	31%	▲ +11.3%
4…d5	12%	17%	▲ +5.4%

Joueurs célèbres

Champions du monde dans cette position

Botvinnik, Mikhail — 10 parties
Tal, Mikhail — 10 parties
Kasparov, Garry — 10 parties
Karpov, Anatoly — 10 parties
Anand, Viswanathan — 10 parties
Carlsen, Magnus — 10 parties
Kramnik, Vladimir — 10 parties
Hou, Yifan — 10 parties
Ju, Wenjun — 10 parties
Ding, Liren — 10 parties
Alekhine, Alexander — 9 parties
Euwe, Max — 8 parties
Smyslov, Vladimir — 8 parties
Karpov, Aleksandr — 8 parties
Gukesh D — 6 parties
Lasker, Emanuel — 3 parties

Parties historiques

4…b6 — 34.7% (6735 parties)

1887 — Englisch, Berthold vs Noa, Joseph — 1-0 — Frankfurt GER
1925 — Bogoljubow, Efim vs Smirnov, Alexander Al — 1-0 — Leningrad RUS
1925 — Marshall Viele, Fabrizio Aaron vs Saemisch, Friedrich — 0-1 — Moscow RUS
1926 — Euwe, Max vs Alekhine, Alexander — 0-1 — Nederland m
1927 — Seitz, Alexander vs Marotti, Davide — 0-1 — Naples ITA

4…c5 — 29.5% (5721 parties)

1919 — Maier, Gennadi vs Lasker, Emanuel — 1/2-1/2 — sim Munich
1920 — Johner, Paul vs Berndtsson, Karl — 1-0 — Goteborg SWE
1920 — Euwe, Max vs Berndtsson, Karl — 1-0 — Goteborg SWE
1921 — Liberman Rubinstein, Joseph vs Maroczi — 1-0 — Lancashire
1922 — Rubinstein, Akiba vs Maroczy, Geza — 1-0 — Londen

4…O-O — 18.8% (3651 parties)

1920 — Reshevsky, Samuel vs Saemisch, Friedrich — 0-1 — Berlin GER
1920 — Rubinstein, Akiba vs Bogoljubow, Efim — 1-0 — Stockholm / Goteburg m
1923 — Harwich, SY. vs Lasker, Emanuel — 1/2-1/2 — Helsingborg SWE
1925 — Rabinovich, Ilya Mar vs Saemisch, Friedrich — 1/2-1/2 — Baden-Baden GER
1929 — Olsson, Kaj vs Stoltz, Gosta — 0-1 — Stockholm SWE

4…d5 — 9.9% (1917 parties)

1922 — Alekhine, Alexander vs Zajicek, Petr — 1-0 — Prague CZE
1936 — Schuchet, I. vs Yanofsky, Daniel Abraham — 0-1 — Toronto CAN
1936 — Spielmann, Rudolf vs Fine, Reuben — 1/2-1/2 — Zandvoort NED
1938 — Botvinnik, Mikhail vs Ragozin, Viacheslav — 1-0 — Moscow RUS
1938 — Eliskases, Erich vs Regedzinski, Theodor — 1-0 — Lodz POL

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● d7→e6, f7→e6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d4 (2v0), ● b5 (2v0), ● e5 (2v0), ● g5 (2v0)	—
Cases faibles	—	—
Centre	● d4 (2v0), ● e5 (2v0)	—

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bf1	● Bf1 Non développé (mob. 0)
Bb4		● Bb4 Actif (mob. 7)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Clouages	● knight c3	—
Non développées	4 (c1, f1, a1, h1)	4 (b8, 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, ● d4-d5, ● e2-e3	● …c7-c6, ● …c7-c5, ● …d7-d6, ● …d7-d5, ● …e6-e5

Partie
1920 Stockholm – Round 2 – Bogoljubow, Efim – 1-0 – Nimzowitsch, Aron – G6 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nc3 d6 5. g3 O-O 6. Bg2 c5 7. O-O Nc6 8. dxc5 Bxc3 9. bxc3 dxc5 10. Bf4 Qxd1
1922 Teplitz-Schoenau – Round 7 – Kostic, Barbara – 1/2-1/2 – Maroczy, Geza – G44 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qb3 c5 6. Nd2 Bxc3 7. bxc3 Nxd2 8. Bxd2 Qc7 9. e4 d6 10. Be2 e5
1926 Semmering – Round 1 – Gilg, Karl – 0-1 – Tarrasch, Siegbert – G30 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qd3 f5 6. g3 b6 7. Bg2 Bb7 8. O-O Nxc3 9. bxc3 Be4 10. Qd2 Be7
1929 Karlsbad – Round 1 – Matisons, Hermanis – 0-1 – Canal, Esteban – G47 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 f5 6. e3 b6 7. Bd3 Bb7 8. O-O Bxc3 9. bxc3 O-O 10. Nd2 Qh4
1929 Ramsgate schev – Round 7 – Winter, William – 1-0 – Znosko-Borovsky, Eugene – G34 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nc3 Ne4 5. Qc2 f5 6. g3 b6 7. Bg2 Bb7 8. O-O Nxc3 9. bxc3 Be7 10. d5 O-O
1934 Bad Liebenwerda – Round 3 – Saemisch, Friedrich – 0-1 – Pitschak, Rudolf – G8 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 f5 6. e3 b6 7. Bd3 Bb7 8. O-O Bxc3 9. bxc3 O-O 10. Nd2 Qh4
1935 Lodz IT – Round 6 – Tartakower, Savielly – 1/2-1/2 – Regedzinski, Teodor – G9 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nc3 Ne4 5. Qc2 f5 6. Bd2 Bxc3 7. Bxc3 Nxc3 8. bxc3 O-O 9. e4 d6 10. Bd3 Nc6
1936 Corr – Round 1 – Balogh, Janos – 1-0 – Keres Paul Petrovich – G8 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 f5 6. g3 b6 7. Bg2 Bb7 8. Nd2 Bxc3 9. bxc3 Nd6 10. Bxb7 Nxb7
1937 Ostende – Round 2 – Keres, Paul – 1-0 – List, Paul – G12 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 d5 6. e3 c5 7. Bd3 Qa5 8. O-O Bxc3 9. bxc3 Nf6 10. Rb1 Nbd7
1940 Moskou ch-URS – Round 1 – Botvinnik, Mikhail – 1/2-1/2 – Ragozin, Viacheslav – G30 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Qe7 5. Bg5 O-O 6. e3 d6 7. Nd2 h6 8. Bh4 Nbd7 9. Be2 g5 10. Bg3 e5
1945 Moscow Ch – Round 5 – Zhivtsov, A. – 0-1 – Ragozin, Viacheslav – G22 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 7. O-O e5 8. Bg5 Bxc3 9. bxc3 Re8 10. Rb1 Rb8
1946 Augsburg – Round 1 – Troger, Paul – 0-1 – Unzicker, Ferdinand, Dr. – G2 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 f5 6. g4 b6 7. gxf5 exf5 8. Bg2 Nc6 9. d5 Na5 10. Bd2 Nxd2
1946 Nt Augsburg GER – Round 15 – Troeger, Paul – 0-1 – Unzicker, Wolfgang – G29 1. c4 Nf6 2. d4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 f5 6. g4 b6 7. gxf5 exf5 8. Bg2 Nc6 9. d5 Na5 10. Bd2 Nxd2
1946 USA Ch New York, NY USA – Round 1 – Ulvestad, Olaf – 1-0 – Kowalski, Stefan – G15 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qd3 f5 6. Nd2 Nxc3 7. bxc3 Be7 8. g3 O-O 9. Bg2 d5 10. cxd5 exd5
1950 Candidats Playoff 1pl – Round 7 – Bronstein, David I – 1-0 – Boleslavsky, Isaac – G6 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. Qb3 a5 6. g3 Nc6 7. Bg2 Ne4 8. O-O Bxc3 9. bxc3 O-O 10. Ne1 f5
1950 Moskou ch-URS – Round 1 – Borisenko, Georgy K – 1/2-1/2 – Liublinsky, Victor – G33 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. Bg5 h6 6. Bh4 Bxc3+ 7. bxc3 Nbd7 8. Nd2 Qe7 9. e4 e5 10. Bd3 Nf8
1955 Moscow m – Round 8 – Kan, Ilya A – 1/2-1/2 – Khachaturov, Andrey Andreevich – G8 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. Bg5 Nbd7 6. Qc2 h6 7. Bxf6 Qxf6 8. O-O-O Bxc3 9. Qxc3 b6 10. g3 Bb7
1956 Leningrad ch-URS – Round 1 – Borisenko, Georgy K – 1/2-1/2 – Lisitsin, Georgy – G42 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. Qc2 Nbd7 6. Bd2 b6 7. e4 Bb7 8. Bd3 e5 9. O-O-O O-O 10. a3 Bxc3
1957 Dublin zt – Round 2 – O'Sullivan, Donal – 0-1 – Van Scheltinga, Theo – G9 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Nc6 5. Bg5 h6 6. Bxf6 Qxf6 7. e4 e5 8. d5 Nd4 9. Be2 Nxe2 10. Qxe2 Bxc3+
1962 Leningrad – Round 1 – Vladimirov, Boris T – 1-0 – Barstatis, Reinhardas – G8 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. Qc2 c5 6. e3 O-O 7. Be2 Nc6 8. O-O e5 9. dxe5 dxe5 10. Rd1 Bd7
1964 Ch URS, Kiev UKR – Round 16 – Borisenko, Georgy K – 1-0 – Goldenov, Boris P – G9 1. d4 e6 2. c4 Bb4+ 3. Nc3 Nf6 4. Nf3 Qe7 5. Qc2 O-O 6. Bg5 d6 7. e3 Re8 8. Nd2 Nbd7 9. Bd3 h6 10. Bh4 b6
1964 Moscow Ch – Round ? – Yudovich, Mikhail M – 1-0 – Bebchuk, Evgeni – G20 1. c4 Nf6 2. Nc3 e6 3. d4 Bb4 4. Nf3 Ne4 5. Qc2 f5 6. e3 O-O 7. Bd3 b6 8. O-O Bxc3 9. bxc3 Ba6 10. a4 Nc6
1964 Moscow zt – Round 1 – Spassky, Boris Vasily – 1/2-1/2 – Bronstein, David I – G1 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. e3 Nbd7 6. Bd2 b6 7. Bd3 Bb7 8. Qc2 e5 9. e4 O-O 10. O-O Re8
1965 Aalborg – Round 1 – Holm, Sejer – 1-0 – Haahr, Thorkild – G18 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. Bg5 Bd7 6. e3 Nc6 7. Qc2 Qe7 8. Be2 O-O-O 9. a3 Bxc3+ 10. Qxc3 h6
42. Olympiad 2016 – Round 4.23 – Bluebaum, Matthias – 1-0 – Roiz, Michael – G277 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. Qc2 Nbd7 6. Bd2 b6 7. e4 Bb7 8. Bd3 e5 9. a3 Bxc3 10. Bxc3 O-O
42. Olympiad 2016 – Round 6.22 – Edouard, Romain – 1-0 – Sosa Trani, Luis A. – G421 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 f5 6. g3 O-O 7. Bg2 d5 8. O-O c6 9. Ne5 Nd7 10. Nd3 Bd6
Corus A 2007 – Round 2 – Aronian, Levon – 1-0 – Ponomariov, Ruslan – G7 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. Qc2 Nbd7 6. g3 c5 7. Bg2 O-O 8. O-O a6 9. Rd1 cxd4 10. Nxd4 Qc7
Makedonia Palace GP 2013 – Round 1.1 – Topalov, Veselin – 1/2-1/2 – Grischuk, Alexander – G1 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d6 5. Qc2 Nbd7 6. g3 b6 7. Bg2 Bb7 8. O-O O-O 9. Rd1 a6 10. a3 Bxc3
Tal Memorial Blitz 2008 – Round 23 – Grischuk, Alexander – 0-1 – Ivanchuk, Vasyl – G194 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. d4 d6 5. Qc2 Nbd7 6. g3 e5 7. Bg2 O-O 8. O-O Bxc3 9. Qxc3 e4 10. Ng5 Re8
World Championship 32th-KK2 1985 – Round 19 – Kasparov, Garry – 1-0 – Karpov, Anatoly – G9 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 f5 6. g3 Nc6 7. Bg2 O-O 8. O-O Bxc3 9. bxc3 Na5 10. c5 d6
World Rapid Final 2012 – Round 12 – Carlsen, Magnus – 0-1 – Ivanchuk, Vasyl – G89 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 f5 6. g3 b6 7. Bg2 Bb7 8. Nd2 Bxc3 9. bxc3 Nd6 10. d5 Na6

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