A31l — English: Symmetrical, Two Knights, 4…e5 5.Nb5
1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e5 5.Nb5 * ● Trait aux Noirs
Ouverture — Centre mobile
♔ Point de vue Blancs
8
7
6
5
4
3
2
1
abcdefgh
Plans. N1c3 (Développer b1 — 3 % des parties) ; Bg5 (Fou actif (mobilité 7), Développer c1 — 2 % des parties).
♚ Point de vue Noirs
1
2
3
4
5
6
7
8
hgfedcba
Plans. ...d5 (Occuper le centre — 91 % des parties) ; ...d6 (Libérer Bc8 — 6 % des parties).
Avantages
Faiblesses
Diagonale active
Plans
Structure de pions
| ♔ Blancs | ♚ Noirs | |
| Pions doublés | — | — |
| Pions isolés | — | — |
| Arriérés | — | — |
| Chaînes | — | — |
| Passés | — | — |
| Majorité | ● aile dame 3v2 | — |
Cases
| ♔ Blancs | ♚ Noirs | |
| Cases fortes | ● d5 (2v1), ● d6 (2v1) | — |
| Cases faibles | — | — |
| Centre | ● d4 (2v1), ● d5 (2v1) | ● e4 (1v0) |
Colonnes et diagonales
| ♔ Blancs | ♚ Noirs | |
| Semi-ouvertes | ● d | ● c |
Pièces
| ♔ Blancs | ♚ Noirs | |
| Bc1 | ● Bc1 Non développé (mob. 5) | |
| Bf1 | ● Bf1 Non développé (mob. 0) | |
| Bc8 | ● Bc8 Non développé (mob. 0) | |
| Bf8 | ● Bf8 Non développé (mob. 5) | |
| Paire de fous | ● Oui | ● Oui |
| Non développées | 5 (● b1, ● c1, ● f1, ● a1, ● h1) | 5 (● b8, ● 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 | ● f2-f4 | ● …d7-d5 |
| Partie |
|---|
| 1948 Moskou ch-URS – Round 15 – Konstantinopolsky, Alexander – 1/2-1/2 – Taimanov, Mark E – G130 1. Nf3 Nf6 2. c4 c5 3. d4 cxd4 4. Nxd4 e5 5. Nb5 Bc5 6. Nd6+ Ke7 7. Nxc8+ Qxc8 8. Nc3 d6 9. e3 Rd8 10. Be2 Nc6 |
| 1954 Belgrade – Round 16 – Rabar, Braslav – 0-1 – Czerniak, Moshe – G127 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 Bc5 6. Nd6+ Ke7 7. Nxc8+ Qxc8 8. Nc3 Bb4 9. Qb3 Na6 10. Bg5 Qc6 |
| 1955 Zagreb – Round 18 – Minev, Nikolay N – 1/2-1/2 – Udovcic, Mijo – G175 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 d6 6. N1c3 a6 7. Na3 Be7 8. e4 O-O 9. Be2 Nc6 10. Nc2 Be6 |
| 1968 IBM-B – Round 11 – Van Scheltinga, Theo – 0-1 – Hartoch, Robert G – G37 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 d6 6. Bg5 Be6 7. e3 Qb6 8. Bxf6 gxf6 9. N1c3 a6 10. Qa4 Nd7 |
| 1969 Zagreb – Round 11 – Cebalo, Miso – 0-1 – Lombardy, William J – G73 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 Bc5 6. Nd6+ Ke7 7. Nxc8+ Qxc8 8. Nc3 Qc6 9. e3 Bb4 10. Bd2 Na6 |
| 40. Olympiad Open 2012 – Round 6.21 – Papaioannou, Ioannis CS – 1-0 – Khader, Sami – G366 1. d4 Nf6 2. Nf3 c5 3. c4 cxd4 4. Nxd4 e5 5. Nb5 d5 6. cxd5 Bc5 7. N5c3 O-O 8. g3 Qb6 9. e3 Bg4 10. Be2 Bh3 |
| 41. Olympiad Open 2014 – Round 8.29 – Juarez Flores, Carlos A. – 0-1 – Markos, Jan – G572 1. d4 Nf6 2. Nf3 c5 3. c4 cxd4 4. Nxd4 e5 5. Nb5 d5 6. cxd5 Bc5 7. e3 O-O 8. N5c3 Qe7 9. Be2 e4 10. a3 a5 |
| Amber Blindfold 2006 – Round 11 – Nielsen, Peter Heine – 1/2-1/2 – Gelfand, Boris – G45 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 d5 6. cxd5 Bc5 7. N5c3 O-O 8. g3 Qb6 9. e3 Bg4 10. Be2 Bxe2 |
| Hoogovens 1979 – Round 2 – Polugaevsky, Lev – 1-0 – Gaprindashvili, Nona – G5 1. Nf3 Nf6 2. c4 c5 3. d4 cxd4 4. Nxd4 e5 5. Nb5 d5 6. cxd5 Bc5 7. N5c3 e4 8. Nxe4 Nxe4 9. Qa4+ Nc6 10. Qxe4+ Ne7 |
| Hoogovens 1996 – Round 8 – Timman, Jan H – 1/2-1/2 – Topalov, Veselin – G39 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 d5 6. cxd5 Bc5 7. N5c3 O-O 8. e3 Qe7 9. Be2 e4 10. a3 Rd8 |
| Interpolis 1993 – Round 1 – Sturua, Zurab – 0-1 – Hodgson, Jeremy K – G15 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 d5 6. cxd5 Bc5 7. e3 O-O 8. N5c3 e4 9. Be2 Re8 10. a3 Nbd7 |
| World Blitz 2009 – Round 36 – Gelfand, Boris – 1-0 – Bareev, Evgeny – G371 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 d5 6. cxd5 a6 7. N5c3 Bc5 8. g3 O-O 9. Bg2 b5 10. O-O Bb7 |
| World Blitz 2022 – Round 2.82 – Postlmayer, Jakob – 0-1 – Christiansen, Johan-Sebastian – G123 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 d5 6. cxd5 Bb4+ 7. N5c3 Nxd5 8. Bd2 Nf6 9. g3 O-O 10. Bg2 Nc6 |
| World Rapid 2021 – Round 13.11 – Efimenko, Zahar – 1/2-1/2 – Giri, Anish – G740 1. Nf3 c5 2. c4 Nf6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 d5 6. cxd5 Bc5 7. N5c3 O-O 8. g3 Ng4 9. e3 f5 10. Be2 Nd7 1/2-1/2 |













Karpov, Anatoly — 1 partie
Carlsen, Magnus — 1 partie
Ju, Wenjun — 1 partie
1972 — Dunkelblum, Arthur vs Bellon Lopez, Juan Manuel — 1/2-1/2 — Caorle zt Caorle ITA
1972 — MacGrillen, Hugh vs Diez del Corral, Jesus — 1/2-1/2 — Skopje MKD
1972 — Panno, Oscar vs Bellon Lopez, Juan Manuel — 1-0 — Palma de Majorca ESP
1974 — Zilberstein, Valery I vs Vladimirov, Yevgeniy — 0-1 — Tbilisi GEO
1966 — Voiculescu, Paul vs Ungureanu, Emil — 0-1 — Bucharest ROU
1968 — Bosch van Rosenthal, Edzard vs Hartoch, Robert G — 0-1 — Amsterdam NED
1980 — Cabarkapa, Milenko vs Heinich, Manfred — 1/2-1/2 — Noordwijkerhout
1980 — Smith, Murray vs Cowley, Robert — 1/2-1/2 — Adelaide AUS
1969 — Cebalo, Miso vs Lombardy, William J — 0-1 — Zagreb CRO
1972 — Webb, Samuel vs Farrand, Julian T — 1/2-1/2 — Brighton ch-BCF
1973 — Heim, Sverre vs Buchal, Stephan — 1-0 — Ribe DEN
1975 — Van Herck, Marcel vs Buchal, Stephan — 1-0 — Ostende tt
1982 — Ortega, Lexy vs Estevez De La Pena, Guillermo Santiago — 1-0 — Havana CUB
1990 — Holfelder, Hans-Joachim vs Lueers, Eckhard — 1-0 — ?
1995 — Grey, Frank vs Schermuly, Sabine — 1-0 — Weilburg GER
1995 — Juhasz, Bela vs Gardos, Attila — 1-0 — HUN-chT2 9596