A17k — English: Nimzo-English, 4.Qc2 O-O

1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4 4.Qc2 O-O * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

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

Côté adverse. Le fou enfermé en c8.

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) ; e4 (Centre d4+e4, menace e5, libère Bf1) ; d3 (Libérer Bc1) ; 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. Plusieurs pièces dorment encore (le cavalier b8, le fou c8 et la tour a8).

Plans. ...d6 (Libérer Bc8) ; ...Nc6 (Développer Nb8) ; ...Bg4 (Clouer Nf3) ; ...c5 (Rupture) ; ...d5 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

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

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e4 (2v1), ● b5 (2v0)	—
Cases faibles	—	—
Centre	● d4 (1v0), ● e4 (2v1), ● e5 (1v0)	—

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bf1	● Bf1 Non développé (mob. 0)
Bb4		● Bb4 Actif (mob. 6)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	4 (c1, f1, a1, h1)	3 (b8, c8, a8)

Sécurité du roi

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

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	semi-ouvert
Ruptures	● c4-c5, ● d2-d3, ● e2-e3	● …c7-c6, ● …c7-c5, ● …d7-d6, ● …d7-d5, ● …e6-e5

Partie
1947 BRA Ch – Round 11 – De Souza Mendes, Joao – 1/2-1/2 – De Freitas, Marcio Elisio – G18 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 d6 6. a3 Bxc3 7. bxc3 e5 8. Be2 Qe7 9. O-O Nc6 10. Rb1 Ne8
1949 URS Ch, semi final – Round 4 – Chekhover, Vitaly – 1/2-1/2 – Sokolsky, Alexey – G33 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 a5 7. b3 d6 8. Bb2 b6 9. g3 Bb7 10. Bg2 Nbd7
1960 Clare Benedict Cup 07th – Round 2 – Clarke, Peter H – 0-1 – Darga, Klaus – G17 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. g3 c5 8. Bg2 e5 9. O-O Nc6 10. d3 Bg4
1960 Leipzig olm prel – Round 2 – Nielsen, Axel – 1/2-1/2 – Portisch, Lajos – G40 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. e3 Re8 6. a3 Bf8 7. d4 d6 8. Bd3 e5 9. dxe5 dxe5 10. O-O Nbd7
1961 Arlesheim int – Round 5 – Emden, Hermann – 0-1 – Dueckstein, Andreas – G13 1. c4 e6 2. Nf3 Nf6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 d6 6. d4 e5 7. Bd3 Nc6 8. dxe5 dxe5 9. O-O Bg4 10. Ne2 Bc5
1961 FRG Ch 06th – Round 13 – Bachmann, Karlheinz – 0-1 – Darga, Klaus – G30 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. g3 d5 6. a3 Be7 7. d3 c5 8. Bg2 Nc6 9. O-O d4 10. Ne4 Nxe4
1963 ENG-NLD m – Round 2.3 – Clarke, Paul R H – 1/2-1/2 – Kramer, Hanspeter – G9 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. e3 b6 6. a3 Bxc3 7. Qxc3 Bb7 8. Be2 d6 9. O-O Nbd7 10. b4 a5
1963 Hoogovens – Round 15 – Langeweg, Kick – 1/2-1/2 – Matanovic, Aleksandar – G120 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d5 7. d3 Nbd7 8. g3 Re8 9. Bg2 e5 10. cxd5 Nxd5
1963 Sweden – Round 6 – Horberg, Bengt-Eric – 1/2-1/2 – Fridh, Anton – G18 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. d3 d6 8. g3 Bb7 9. Bg2 Nbd7 10. O-O c5
1965 DDR Ch 15th – Round 9 – Golz, Werner – 1/2-1/2 – Liebert, Heinz – G40 1. c4 Nf6 2. Nf3 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 d6 9. d4 Nbd7 10. O-O e5
1965 Tallinn ch-URS – Round 1 – Liavdansky, Vladimir – 1/2-1/2 – Polugaevsky, Lev – G129 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e3 b6 6. Be2 Bb7 7. O-O d5 8. a3 Bd6 9. b4 Nbd7 10. cxd5 exd5
1967 Sochi – Round 1 – Lein, Andreas – 1/2-1/2 – Lengyel, Laszlo – G4 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. g3 e5 8. Bg2 Re8 9. O-O a5 10. d3 Nc6
1967 Sochi – Round 2 – Lein, Anatoly – 1/2-1/2 – Lengyel, Levente – G26 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. g3 e5 8. Bg2 Re8 9. O-O a5 10. d3 Nc6
1968 Monte Carlo – Round 3 – Gheorghiu, Florin – 1/2-1/2 – Damjanovic, Marko – G19 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. g3 Bb7 8. Bg2 d6 9. O-O Nbd7 10. Rd1 d5
1969 Buesum – Round 11 – Polugaevsky, Lev – 0-1 – Larsen, Bent Ravn – G30 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 d6 9. b4 Ne4 10. Qc2 Ng5
1969 IBM I – Round 6 – Gheorghiu, Florin – 1-0 – Tatai, Stefano – G23 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. b4 a5 9. Bb2 Qe7 10. Be2 axb4
1970 Vinkovci – Round 11 – Petrosian, Tigran V. – 1/2-1/2 – Larsen, Bent – G12 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. g3 b6 8. Bg2 Bb7 9. O-O c5 10. b4 Nc6
1971 Hoogovens – Round 6 – Ivkov, Borislav – 1/2-1/2 – Langeweg, Kick – G24 1. c4 Nf6 2. Nf3 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. b4 e5 8. Bb2 b6 9. e3 c5 10. Be2 Bb7
1975 URS Team Ch – Round 3 – Agzamov, Georgy – 1-0 – Govashelishvili, Genadij – G44 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. d4 b6 8. g3 Bb7 9. Bg2 Nbd7 10. O-O Ne4
36. Olympiad 2004 – Round 10 – Vallejo Pons, Francisco – 1/2-1/2 – Papaioannou, Ioannis CS – G369 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 Ne4 9. Qc2 f5 10. b3 d6
40. Olympiad Open 2012 – Round 10.2 – Jakovenko, Dmitry – 1/2-1/2 – Mareco, Sandro – G555 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 c5 9. b4 d6 10. Bb2 Nbd7
42. Olympiad 2016 – Round 3.1 – Grischuk, Alexander – 1-0 – Hamitevici, Vladimir – G169 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 a5 7. d4 a4 8. Bg5 d6 9. e3 Nbd7 10. Bd3 b6
Amber Blindfold 2007 – Round 1 – Van Wely, Loek – 0-1 – Ivanchuk, Vasyl – G1 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 d6 9. O-O a5 10. b3 Nbd7
Amber Rapidplay 2002 – Round 8 – Van Wely, Loek – 0-1 – Kramnik, Vladimir – G36 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 Bb7 8. Bb2 d6 9. g3 Nbd7 10. Bg2 c5
Amber-blindfold 10th 2001 – Round 4 – Van Wely, Loek – 1/2-1/2 – Almasi, Zoltan – G6 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. b4 a5 8. Bb2 axb4 9. axb4 Rxa1+ 10. Bxa1 e5
Amber-blindfold 14th 2005 – Round 9 – Van Wely, Loek – 0-1 – Anand, Viswanathan – G4 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 a5 8. Bb2 axb4 9. axb4 Rxa1+ 10. Bxa1 c5
Amber-rapid 13th 2004 – Round 8 – Van Wely, Loek – 0-1 – Kramnik, Vladimir – G21 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 a5 8. Bb2 axb4 9. axb4 Rxa1+ 10. Bxa1 c5
Amber-rapid 16th 2007 – Round 5 – Kramnik, Vladimir – 0-1 – Ivanchuk, Vasyl – G13 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. b4 a5 8. Bb2 e5 9. g3 axb4 10. axb4 Rxa1+
Amber-rapid 6th 1997 – Round 7 – Kramnik, Vladimir – 1-0 – Nikolic, Predrag – G39 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. g3 Bb7 8. Bg2 c5 9. b4 d6 10. O-O Nbd7
Belgrade 1987 – Round 1 – Timman, Jan H – 1-0 – Nikolic, Predrag – G37 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 a5 8. Bb2 axb4 9. axb4 Rxa1+ 10. Bxa1 c5
Buenos Aires 1980 – Round 1 – Timman, Jan H – 1/2-1/2 – Larsen, Bent – G2 1. c4 e6 2. Nf3 Nf6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. e3 e5 8. b4 Re8 9. Bb2 Nc6 10. Be2 Bg4
Candidats Tournament 1985 – Round 12 – Spraggett, Kevin – 1/2-1/2 – Ribli, Zoltan – G68 1. c4 Nf6 2. Nf3 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e3 b6 6. b3 Bb7 7. Bb2 d5 8. Be2 Nbd7 9. O-O a6 10. Rad1 Qe7
Chess Classics Giants 1. pl 1998 – Round 3 – Kramnik, Vladimir – 1/2-1/2 – Anand, Viswanathan – G1 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 Bb7 8. Bb2 d6 9. e3 a5 10. Be2 axb4
Corus A 2008 – Round 13 – Gelfand, Boris – 1-0 – Eljanov, Pavel – G90 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. b4 d6 9. Bb2 Nbd7 10. Be2 c5
Dortmund 1995 – Round 1 – Bareev, Evgeny – 0-1 – Karpov, Anatoly – G5 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. g3 Bb7 8. Bg2 c5 9. b4 d6 10. O-O Nbd7
Dortmund 1998 – Round 1 – Kramnik, Vladimir – 1/2-1/2 – Anand, Viswanathan – G5 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 a5 8. Bb2 axb4 9. axb4 Rxa1+ 10. Bxa1 c5
Dos Hermanas 1997 – Round ? – Kramnik, Vladimir – 1-0 – Karpov, Anatoly – G2 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 Bb7 8. Bb2 d6 9. e3 Nbd7 10. d4 Ne4
Dos Hermanas 1997 – Round 3 – Kramnik, Vladimir – 1-0 – Karpov, Anatoly – G11 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 Bb7 8. Bb2 d6 9. e3 Nbd7 10. d4 Ne4
Dos Hermanas 1997 – Round 5 – Kramnik, Vladimir – 1-0 – Illescas Cordoba, Miguel – G20 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. g3 Bb7 8. Bg2 c5 9. b4 d6 10. O-O Nbd7
FIDE GP 2008 – Round 5 – Grischuk, Alexander – 1/2-1/2 – Adams, Michael – G35 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 c5 8. Be2 d6 9. O-O Bb7 10. b4 e5
FIDE WCh KO 2000 – Round 3.4 – Yermolinsky, Alex – 0-1 – Adams, Michael – G108 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 Bb7 8. Bb2 d6 9. g3 Nbd7 10. Bg2 Ne5
FIDE WCh KO 2000 – Round 5.2 – Khalifman, Alexander – 1/2-1/2 – Anand, Viswanathan – G121 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 a5 8. Bb2 axb4 9. axb4 Rxa1+ 10. Bxa1 c5
FIDE World Cup 2015 – Round 1.2 – Bukavshin, Ivan – 1/2-1/2 – Zhigalko, Sergei – G124 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. b4 e5 8. Bb2 Nbd7 9. e3 Re8 10. d4 e4
FIDE World Cup 2015 – Round 1.4 – Bukavshin, Ivan – 0-1 – Zhigalko, Sergei – G174 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. b4 e5 8. Bb2 Nbd7 9. d3 Re8 10. g3 Nb6
FIDE-Wch k.o. g/25+10 1999 – Round 5.4 – Kramnik, Vladimir – 1/2-1/2 – Adams, Michael – G47 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 c5 9. b4 d6 10. Bb2 e5
GMA 2004 – Round 6 – Kramnik, Vladimir – 1-0 – Zhang, Zhong – G41 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 d6 9. O-O Nbd7 10. b4 c5
Hoogovens 1978 – Round 1 – Portisch, Lajos – 1-0 – Najdorf, Miguel – G6 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 Bb7 8. Bb2 d6 9. e3 Nbd7 10. Be2 c5
KRO-tweekamp 1982 – Round 4 – Timman, Jan H – 1-0 – Korchnoi, Viktor – G3 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. b4 d6 9. Bb2 Nbd7 10. Be2 Qe7
Leningrad ch-URS 1977 – Round 1 – Petrosian, Tigran V. – 1-0 – Balashov, Yuri S – G7 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. b3 c5 6. Bb2 Qe7 7. e3 Nc6 8. Be2 d6 9. O-O Bxc3 10. Bxc3 e5
Moscow 1975 – Round 1 – Vaganian, Rafael A – 1-0 – Korchnoi, Viktor – G11 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. g3 Bb7 8. Bg2 d5 9. d4 dxc4 10. Qxc4 Be4
Novi Sad olm 1990 – Round 12 – Barbero, Gerardo F – 0-1 – Timman, Jan H – G87 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. b4 e5 8. Bb2 Re8 9. d3 Bg4 10. e3 Nbd7
Olympiad 2002 – Round 5 – Sasikiran, Krishnan – 0-1 – Rozentalis, Eduardas – G169 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 d6 9. O-O c5 10. b4 Nbd7
Rio de Janeiro Interzonal 1979 – Round 15 – Smejkal, Jan – 0-1 – Timman, Jan H – G46 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b3 Bb7 8. Bb2 d6 9. e3 e5 10. d4 Ne4
Tal Memorial Blitz 2008 – Round 33 – Grischuk, Alexander – 0-1 – Karjakin, Sergey – G280 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. e3 b6 8. Be2 Bb7 9. O-O a5 10. b3 Nbd7
Vienna Millenium 1996 – Round 3 – Kramnik, Vladimir – 1-0 – Ehlvest, Jaan – G10 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 c5 7. b4 b6 8. g3 Nc6 9. Bg2 Bb7 10. O-O d6
World Blitz 2007 – Round 27 – Gelfand, Boris – 1-0 – Adams, Michael – G267 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 a5 8. b3 d6 9. Bb2 e5 10. d4 e4
World Blitz 2015 – Round 3.11 – Iturrizaga Bonelli, Eduardo – 0-1 – Socko, Bartosz – G144 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 c5 9. b4 d6 10. Bb2 Nbd7
World Blitz 2016 – Round 19.34 – Svane, Rasmus – 1-0 – Mareco, Sandro – G760 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. g3 e5 8. Bg2 Re8 9. b4 e4 10. Nd4 c5
World Blitz 2017 – Round 18.17 – Bu, Xiangzhi – 1-0 – Socko, Bartosz – G924 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. e3 Bb7 8. Be2 c5 9. O-O d5 10. b4 Nbd7
World Blitz 2018 – Round 13.54 – Mchedlishvili, Mikheil – 1/2-1/2 – Anisimov, Pavel – G794 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 c5 7. b4 b6 8. Bb2 Bb7 9. e3 Qe7 10. Be2 Rc8
World Championship 35th-KK5 1990 – Round 24 – Kasparov, Garry – 1/2-1/2 – Karpov, Anatoly – G16 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b4 d6 8. Bb2 Bb7 9. g3 c5 10. Bg2 Nbd7
World Cup 1989 – Round 1 – Vaganian, Rafael A – 1/2-1/2 – Nikolic, Predrag – G44 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 b6 7. b3 Bb7 8. Bb2 c5 9. e3 d6 10. Be2 e5

A17k — Nimzo-English

1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4 4.Qc2 O-O

Eval: [+0.25]

Les coups candidats

5.a3 — 85.8% (2341 parties)

Ambassadeurs : Rozentalis, Eduardas (36x), Pogorelov, Ruslan (21x), Korchnoi, Viktor (19x), Kramnik, Vladimir (19x), Drasko, Milan (18x), Timman, Jan H (17x), Kholmov, Ratmir D (15x), Uhlmann, Wolfgang (13x)

5.e3 — 4.0% (108 parties)

Ambassadeurs : Eingorn, Vereslav S (4x), Seawell, Mark (2x), Petrov, Georgi (2x), Egorov, Vladimir (2x), Levy, David N L (1x), Ligterink, Gert (1x), Nielsen, Axel (1x), Portisch, Lajos (1x)

5.g3 — 3.9% (106 parties)

Ambassadeurs : Uhlmann, Wolfgang (11x), Popovic, Petar (2x), Serrer, Christoph (2x), Vaganian, Rafael A (2x), Guyene, Thierry (2x), Payet, Amelie (2x), Muco, Fatos (2x), Pogorelov, Ruslan (2x)

5.e4 — 2.8% (77 parties)

Ambassadeurs : Milos, Gilberto (3x), Nikolenko, Oleg (3x), Perez Garcia, Miguel 2008 (2x), Le Duigou, Jean-Guy (2x), Reza, Wojciech (2x), De Souza Mendes, Joao (1x), De Freitas, Marcio Elisio (1x), Emden, Hermann (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	5.a3	5.e3	5.g3	5.e4
<1800	24	67%	8%	—	8%
1800-2200	413	80%	6%	6%	4%
2200-2600	1906	88%	3%	3%	2%
2600+	155	95%	1%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	5.a3	5.e3	5.g3	5.e4
1940s	2	50%	—	—	50%
1950s	4	75%	—	—	—
1960s	18	56%	28%	6%	11%
1970s	98	77%	2%	7%	2%
1980s	230	77%	6%	8%	3%
1990s	426	82%	4%	8%	3%
2000s	885	90%	3%	3%	2%
2010s	864	87%	5%	2%	3%
2020s	202	88%	3%	0%	5%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
5.a3	87%	88%	▲ +0.7%
5.e3	5%	3%	▼ -1.7%
5.g3	2%	0%	▼ -1.8%
5.e4	3%	5%	▲ +1.9%

Joueurs célèbres

Champions du monde dans cette position

Kramnik, Vladimir — 10 parties
Anand, Viswanathan — 9 parties
Karpov, Anatoly — 7 parties
Kasparov, Garry — 6 parties
Karpov, Aleksandr — 5 parties
Hou, Yifan — 4 parties
Tal, Mikhail — 3 parties
Smyslov, Vladimir — 2 parties
Carlsen, Magnus — 2 parties
Euwe, Max — 1 partie
Botvinnik, Mikhail — 1 partie

Parties historiques

5.a3 — 85.8% (2341 parties)

1949 — Chekhover, Vitaly vs Sokolsky, Alexey — 1/2-1/2 — Vilnius LTU
1950 — Steinmeyer, Robert vs Byrne, Robert E — 1/2-1/2 — New York ch USA
1956 — Sherwin, James T vs Day, Fabian — 1-0 — Oklahoma City, OK USA
1958 — Averbakh, Yuri L vs Veresov, Gavriil — 1-0 — Vilnius LTU
1960 — Clarke, Peter H vs Darga, Klaus — 0-1 — Biel SUI

5.e3 — 4.0% (108 parties)

1960 — Nielsen, Axel vs Portisch, Lajos — 1/2-1/2 — Leipzig GER
1963 — Clarke, Paul R H vs Kramer, Hanspeter — 1/2-1/2 — Birmingham ENG
1964 — Vaysman, Alexander vs Soloviev, Vladimir A — 0-1 — Moscow RUS
1965 — Liavdansky, Vladimir vs Polugaevsky, Lev — 1/2-1/2 — Tallinn ch-URS
1967 — Levy, David N L vs Ligterink, Gert — 1/2-1/2 — Groningen NED

5.g3 — 3.9% (106 parties)

1961 — Bachmann, Karlheinz vs Darga, Klaus — 0-1 — Bad Pyrmont GER
1972 — Uhlmann, Wolfgang vs Moehring, Guenther — 1/2-1/2 — Leipzig GER
1972 — Ornstein, Axel vs Kinnmark, Ove — 1-0 — Skelleftea SWE
1975 — Vaganian, Rafael A vs Grigorian, Karen — 1-0 — Vilnius LTU
1977 — Stokes, GN. vs Griffiths, Peter C — 0-1 — ?

5.e4 — 2.8% (77 parties)

1947 — De Souza Mendes, Joao vs De Freitas, Marcio Elisio — 1/2-1/2 — Porto Alegre
1961 — Emden, Hermann vs Dueckstein, Andreas — 0-1 — Arlesheim
1961 — Moehring, Guenther vs Mititelu, Gheorghe — 0-1 — Chemnitz
1976 — Umansky, Mikhail vs Bramburg — 1-0 — RSFSR-5ch/f [Holecek,K
1977 — Hort, Vlastimil vs Sosonko, Gennadi — 1-0 — Tilburg NED

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