E56a — Nimzo-Indian: Main Line, 7…Nc6

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O Nc6 * ○ Trait aux Blancs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plan principal. Exploiter la case forte b5….

Atouts. Les Blancs s'appuient sur les cases fortes b5 et e5, un fou actif en d3 et la paire de fous.

Côté adverse. Le fou enfermé en c8.

En contrepartie. Plusieurs pièces dorment encore (le fou c1 et la tour a1).

Plans. Bd2 (Développer Bc1) ; h3 (Empêcher ...Bg4).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plan principal. Exploiter la case forte e4.

Atouts. Les Noirs s'appuient sur la case forte b4, un avant-poste en e4 et la paire de fous.

Côté adverse. Le fou enfermé en c1.

En contrepartie. Plusieurs pièces dorment encore (le fou c8 et la tour a8).

Plans. ...Bd7 (PRIORITÉ: libérer le Bc8 (...Bd7, b6+Bb7, ...Bg4, ...Bf5)) ; ...e5 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→e3, e3→d4	● e6→d5, f7→e6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● b5 (2v0), ● e5 (2v1)	● b4 (2v0)
Cases faibles	● e4	—
Centre	● e5 (2v1)	● d5 (3v2)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 1)
Bd3	● Bd3 Actif (mob. 7)
Bb4		● Bb4 Ok (mob. 3)
Bc8		● Bc8 Non développé (mob. 1)
Paire de fous	● Oui	● Oui
Non développées	2 (● c1, ● a1)	2 (● c8, ● a8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Roqué	● Roqué
Droits de roque	—	—

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	fermé
Ruptures	● e3-e4	● …e6-e5

Partie
1933 BCF Ch 26th – Round 3 – Abrahams, Gerald – 0-1 – Sultan Khan, Mir – G6 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. Ne2 cxd4 9. exd4 dxc4 10. Bxc4 Qc7
1946 JUG Ch – Round 11 – Rabar, Braslav – 1/2-1/2 – Bozic, Aleksandar – G34 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. Ne2 cxd4 9. exd4 dxc4 10. Bxc4 Be7
1949 Hastings4950 – Round 3 – Koenig, Imre – 0-1 – Euwe, Max – G12 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. h3 dxc4 9. Bxc4 cxd4 10. exd4 Be7
1950 Amsterdam – Round 1 – Van Scheltinga, Theo – 1/2-1/2 – Donner, H. – G20 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 c5 6. Nf3 d5 7. O-O Nc6 8. Ne2 cxd4 9. exd4 dxc4 10. Bxc4 a6
1950 Amsterdam – Round 1 – Van Scheltinga, Theo – 1/2-1/2 – Donner, Jan-Hein – G19 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 c5 6. Nf3 d5 7. O-O Nc6 8. Ne2 cxd4 9. exd4 dxc4 10. Bxc4 a6
1950 Moskou ch-URS – Round 1 – Alatortsev, Vladimir N. – 1/2-1/2 – Petrosian, Tigran A. – G37 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 d5 5. Nf3 O-O 6. Bd3 c5 7. O-O Nc6 8. Ne2 cxd4 9. exd4 Be7 10. b3 b6
1950 YUG-USA m radio – Round 1.1 – Reshevsky, Samuel – 1/2-1/2 – Gligoric, Svetozar – G1 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 c5 6. Nf3 d5 7. O-O Nc6 8. dxc5 Bxc5 9. a3 dxc4 10. Bxc4 Qxd1
1951 Staunton Memorial – Round 4 – Pirc, Vasja – 1-0 – Unzicker, Wolfgang – G27 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 O-O 6. Nf3 Nc6 7. O-O d5 8. Re1 a6 9. Ne5 Nxe5 10. dxe5 dxc4
1952 Helsinki olm – Round ? – Morcken, Otto B – 1/2-1/2 – De Souza Mendes, Joao – G304 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O 6. Bd3 Nc6 7. O-O d5 8. dxc5 dxc4 9. Bxc4 Bxc5 10. b3 a6
1953 Glasgow International – Round 2 – Fairhurst, William – 1/2-1/2 – Golombek, Harry – G4 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 d5 6. Nf3 Nc6 7. O-O O-O 8. Ne2 cxd4 9. exd4 dxc4 10. Bxc4 a6
1954 URS Team Ch – Round 11 – Poljak, Srebrenka – 0-1 – Tolush, Alexander V – G210 1. Nf3 Nf6 2. c4 e6 3. Nc3 d5 4. d4 Bb4 5. e3 O-O 6. Bd3 c5 7. O-O Nc6 8. Ne2 cxd4 9. cxd5 exd5 10. Nexd4 Bg4
1955 Gothenburg Interzonal – Round 17 – Fuderer, Andrija – 1/2-1/2 – Spassky, Boris Vasily – G157 1. c4 Nf6 2. Nc3 e6 3. d4 Bb4 4. Nf3 c5 5. e3 O-O 6. Bd3 Nc6 7. O-O d5 8. dxc5 Bxc5 9. a3 a6 10. b4 Ba7
1956 Moscow olm fin-A – Round 6 – Pedersen, Ebbe – 1-0 – Troianescu, Octav – G92 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O 6. Bd3 d5 7. O-O Nc6 8. Ne2 cxd4 9. exd4 dxc4 10. Bxc4 Be7
1956 URS Ch, semi final – Round 7 – Khalilbeili, Sultan – 1/2-1/2 – Voronkov, Boris – G71 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O 6. Bd3 d5 7. O-O Nc6 8. dxc5 dxc4 9. Bxc4 Qxd1 10. Rxd1 Bxc5
1960 Leipzig olm fin-C – Round 3 – Magrin, Antonio – 0-1 – O'Hare, Eugene – G11 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O 6. Bd3 d5 7. O-O Nc6 8. h3 cxd4 9. exd4 dxc4 10. Bxc4 a6
1961 IBM – Round 9 – Crabbendam, Hans – 0-1 – Van den Berg, Cees – G44 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. Ne2 cxd4 9. exd4 dxc4 10. Bxc4 b6
1963 Rubinstein Memorial – Round 7 – Fronczek, Heinrich – 0-1 – Padevsky, Nikola – G45 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4 5. e3 O-O 6. Bd3 c5 7. O-O Nc6 8. Ne2 cxd4 9. exd4 dxc4 10. Bxc4 a6
1964 Buenos Aires – Round 6 – Letelier Martner, Rene – 0-1 – Schweber, Samuel – G56 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O 6. Bd3 d5 7. a3 dxc4 8. Bxc4 Ba5 9. O-O Nc6 10. Qe2 cxd4
1964 Southampton League Div 1 – Round 7.1 – Collins, Richard Arnold – 1-0 – Mitchell, Robert – G5 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O 6. Bd3 d5 7. O-O Nc6 8. Ne2 dxc4 9. Bxc4 cxd4 10. exd4 Qc7
1967 ITA-ch28 Savona – Round 1 – Magrin, Antonio – 0-1 – Romani, Elio – G2 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 c5 6. Nf3 d5 7. O-O Nc6 8. Ne2 dxc4 9. Bxc4 cxd4 10. exd4 Bd6

E56a — Main Line

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O Nc6

Les coups candidats

8.a3 — 89.8% (7987 parties) →

Ambassadeurs : Mroczek, Jacek (37x), Donner, Jan-Hein (35x), Taimanov, Mark (35x), Gligorić, Svetozar (34x), Averbakh, Yuri L (31x), Knaak, Rainer (29x), Isigkeit, Hans-Jürgen (28x), Reshevsky, Samuel (27x)

8.cxd5 — 7.2% (638 parties) →

Ambassadeurs : Aleksandrov Ivanchev, Aleksandar (15x), Vaisser, Anatoly (6x), Schulenberg, Henk A T (6x), Langer, Raimund (6x), Kolpak, Sergey Fedorovich (6x), Ben Artzi, Ido (5x), Deskin, Gary (5x), Salem, A.R. Saleh (5x)

8.dxc5 — 1.0% (90 parties)

Ambassadeurs : Palladino, Mario (3x), Øvergaard, Jens (3x), Bernal Varela, Nelson (2x), Aannevik, Bjarne (2x), Au Cardero, Ramón (2x), Fuderer, Andrija (1x), Spassky, Boris Vasily (1x), Khalilbeili, Sultan (1x)

8.Ne2 — 0.8% (74 parties)

Ambassadeurs : Portisch, Ferenc (3x), Alatortsev, Vladimir N. (2x), Flatau, Leo (2x), Collins, Richard Arnold (2x), Van Scheltinga, Theo (2x), Usachyi, Vladimir (2x), Rabar, Braslav (1x), Bozic, Aleksandar (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	8.a3	8.cxd5	8.dxc5	8.Ne2
<1800	137	80%	12%	2%	1%
1800-2200	2083	88%	8%	1%	1%
2200-2600	4118	89%	9%	1%	1%
2600+	213	87%	13%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	8.a3	8.cxd5	8.dxc5	8.Ne2
1900s	1	100%	—	—	—
1910s	1	100%	—	—	—
1930s	19	79%	16%	—	5%
1940s	23	78%	13%	—	4%
1950s	551	95%	2%	1%	2%
1960s	461	96%	2%	0%	2%
1970s	461	95%	2%	1%	1%
1980s	483	96%	1%	1%	1%
1990s	931	95%	3%	0%	1%
2000s	2101	93%	4%	1%	1%
2010s	3596	85%	11%	1%	0%
2020s	269	68%	30%	1%	0%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
8.a3	85%	68%	▼ -17.0%
8.cxd5	11%	30%	▲ +18.3%
8.dxc5	1%	1%	+0.2%
8.Ne2	0%	0%	-0.1%

Joueurs célèbres

Champions du monde dans cette position

Euwe, Max — 10 parties
Tal, Mikhail — 10 parties
Hou, Yifan — 9 parties
Kramnik, Vladimir — 7 parties
Botvinnik, Mikhail — 6 parties
Alekhine, Alexander — 4 parties
Smyslov, Vladimir — 4 parties
Kasparov, Garry — 2 parties
Karpov, Anatoly — 1 partie
Karpov, Aleksandr — 1 partie
Anand, Viswanathan — 1 partie

Parties historiques

8.a3 — 89.8% (7987 parties)

1909 — Alekhine, Alexander vs Bernstein allies — 0-1 — Moscow RUS
1911 — Burn, Amos vs Bernstein, Olivia — 1-0 — San Sebastian ESP
1932 — Rellstab, Ludwig vs Saemisch, Friedrich — 1/2-1/2 — Berlin GER
1932 — Rellstab, Ludwig Sr vs Rejfir, Josef — 0-1 — Hastings ENG
1935 — Nielsen, Julius vs Muller, Hans — 0-1 — Warsaw POL

8.cxd5 — 7.2% (638 parties)

1939 — Landau, Salo vs Van Scheltinga, Theo — 1/2-1/2 — Amsterdam NED
1939 — Landau, Salo vs Van Scheltinga, Theo — 1-0 — Amsterdam NED
1939 — Landau, Salo vs Szabo, Ladislav — 1/2-1/2 — Amsterdam NED
1946 — Herrmann, Ludwig vs Koch, Berthold — 0-1 — Leipzig GER
1946 — Kramer, Haije vs Forster, James Connor Christophe — 1/2-1/2 — Pittsburgh

8.dxc5 — 1.0% (90 parties)

1950 — Reshevsky, Samuel vs Gligoric, Svetozar — 1/2-1/2 — Radio
1952 — Morcken, Otto B vs De Souza Mendes, Joao — 1/2-1/2 — Helsinki olm
1955 — Fuderer, Andrija vs Spassky, Boris Vasily — 1/2-1/2 — Goteborg SWE
1956 — Khalilbeili, Sultan vs Voronkov, Boris — 1/2-1/2 — Tbilisi GEO
1964 — Enevoldsen, Jens vs Kolvig, Bent — 1-0 — Copenhagen DEN

8.Ne2 — 0.8% (74 parties)

1933 — Abrahams, Gerald vs Sultan Khan, Mir — 0-1 — Hastings ENG
1946 — Rabar, Braslav vs Bozic, Aleksandar — 1/2-1/2 — Zagreb CRO
1950 — Alatortsev, Vladimir N. vs Petrosian, Tigran A. — 1/2-1/2 — Moskou ch-URS
1950 — Alatortsev, Vladimir N. vs Petrosian, Arshak B — 1/2-1/2 — URS-ch18 Moscow
1950 — Van Scheltinga, Theo vs Donner, Jan-Hein — 1/2-1/2 — Amsterdam NED

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