Structure de pions
| ♔ Blancs | ♚ Noirs | |
| Pions doublés | — | — |
| Pions isolés | — | — |
| Arriérés | — | — |
| Chaînes | ● f2→g3, h2→g3 | ● a7→b6, c7→b6, d7→e6, f7→e6 |
| Passés | — | — |
| Majorité | — | — |
Cases
| ♔ Blancs | ♚ Noirs | |
| Cases fortes | ● f4 (2v0), ● e5 (2v0), ● g5 (2v0) | ● e4 (2v0) |
| Cases faibles | — | — |
| Centre | ● d4 (2v0), ● e5 (2v0) | ● d5 (3v1), ● e4 (2v0) |
Colonnes et diagonales
| ♔ Blancs | ♚ Noirs |
Pièces
| ♔ Blancs | ♚ Noirs | |
| Bg2 | ● Bg2 Ok (mob. 2) | |
| Bb7 | ● Bb7 Actif (mob. 6) | |
| Paire de fous | Non | Non |
| Non développées | 3 (● b1, ● a1, ● h1) | 3 (● b8, ● 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 | ● c4-c5, ● d4-d5 | ● …c7-c5, ● …d7-d5, ● …e6-e5 |
E16p — Capablanca
1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 Bxd2+ 7.Qxd2 ● Trait aux Noirs
Ouverture — Centre mobile
♔ Point de vue Blancs
8
7
6
5
4
3
2
1
abcdefgh
Plan principal. Jeu au centre (rupture c4-c5).
Atouts. Les Blancs s'appuient sur un contrôle dominant de f4, e5 et g5.
Côté adverse. Le roi resté au centre.
En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (le cavalier b1 et les tours a1 et h1).
Plans. Nc3 (Développer b1 — 64 % des parties) ; O-O (Mettre le roi en sécurité, connecter les tours — 33 % des parties).
Atouts. Les Blancs s'appuient sur un contrôle dominant de f4, e5 et g5.
Côté adverse. Le roi resté au centre.
En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (le cavalier b1 et les tours a1 et h1).
Plans. Nc3 (Développer b1 — 64 % des parties) ; O-O (Mettre le roi en sécurité, connecter les tours — 33 % des parties).
♚ Point de vue Noirs
1
2
3
4
5
6
7
8
hgfedcba
Plan principal. Mettre le roi à l'abri (...O-O dans 73 % des parties).
Atouts. Les Noirs s'appuient sur un contrôle dominant de e4 et un fou actif en b7.
Côté adverse. Le roi resté au centre.
En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (le cavalier b8 et les tours a8 et h8).
Plans. ...O-O (Mettre le roi en sécurité, connecter les tours — 73 % des parties) ; ...d6 (Poussée — 21 % des parties).
Atouts. Les Noirs s'appuient sur un contrôle dominant de e4 et un fou actif en b7.
Côté adverse. Le roi resté au centre.
En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (le cavalier b8 et les tours a8 et h8).
Plans. ...O-O (Mettre le roi en sécurité, connecter les tours — 73 % des parties) ; ...d6 (Poussée — 21 % des parties).
Avantages
Faiblesses
Diagonale active
Plans
| Partie |
|---|
| 1928 Scarborough – Round 5 – Winter, William – 0-1 – Michell, Reginald – G11 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Bxd2+ 5. Qxd2 b6 6. g3 Bb7 7. Bg2 d6 8. Qc2 c5 9. e3 Nbd7 10. Nc3 a6 |
| 1928 The Hague ol (Men) – Round 1 – Monticelli, Mario – 1-0 – Gilg, Karl – G4 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Nbd7 9. Qc2 O-O 10. O-O Qe7 |
| 1929 Karlsbad – Round 1 – Gruenfeld, Ernst – 1-0 – Thomas, George Alan – G73 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Qc2 O-O 10. Nc3 Qe7 |
| 1929 Rosario – Round 1 – Rivarola, Joao – 1-0 – Maderna, Carlos – G11 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Nbd7 9. O-O O-O 10. Qc2 h6 |
| 1931 Bled – Round 24 – Vidmar Milan – 1/2-1/2 – Nimzowitsch, Aron – G150 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Qc2 Nxc3 |
| 1931 Blitz Match – Round 1 – Lundin, Erik – 1/2-1/2 – Opocensky, Karel – G1 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Nbd7 9. Qc2 O-O 10. O-O Re8 |
| 1932 Amsterdam/Karlsbad m – Round 12 – Euwe, Max – 1/2-1/2 – Flohr, Salo – G12 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. d5 e5 9. Nc3 Nbd7 10. O-O O-O |
| 1932 Bad Sliac – Round 1 – Bogoljubow, Efim – 1-0 – Master Walter Aira – G80 1. Nf3 Nf6 2. d4 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O O-O 9. Nc3 Ne4 10. Nxe4 Bxe4 |
| 1932 Bad Sliac – Round 1 – Spielmann, Rudolf – 1/2-1/2 – Flohr, Salo – G42 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Qe3 Nxc3 |
| 1932 Bad Sliac – Round 1 – Vidmar, Marjeta – 1/2-1/2 – Rohacek, Ivan – G41 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Ne4 9. Qc2 Nxc3 10. Qxc3 O-O |
| 1932 Bern – Round 10 – Bernstein, Olivia – 1-0 – Stahelin, A – G81 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O O-O 9. Nc3 Ne4 10. Qc2 f5 |
| 1932 Bern – Round 10 – Johner, Hans – 1/2-1/2 – Johner, Paul – G80 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb4+ 5. Bd2 Bxd2+ 6. Qxd2 Bb7 7. Bg2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Qc2 Nxc3 |
| 1932 Bern – Round 12 – Bernstein, Olivia – 1-0 – Voellmy, Erwin – G89 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. d5 Rb8 10. dxe6 fxe6 |
| 1932 Bern – Round 14 – Alekhine, Alexander – 1-0 – Johner, Paul – G103 1. d4 Nf6 2. Nf3 b6 3. c4 e6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. d5 exd5 10. Nh4 Ne4 |
| 1932 Bern – Round 15 – Bernstein, Olivia – 1/2-1/2 – Flohr, Salo – G106 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Nxe4 Bxe4 |
| 1932 Bern – Round 6 – Euwe, Max – 1/2-1/2 – Johner, Paul – G53 1. d4 Nf6 2. Nf3 b6 3. c4 e6 4. g3 Bb4+ 5. Bd2 Bxd2+ 6. Qxd2 Bb7 7. Bg2 d6 8. O-O Nbd7 9. Re1 Qc8 10. Qf4 Nf8 |
| 1932 Bern – Round 9 – Colin, Barron Alberto – 0-1 – Flohr, Salo – G72 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Nbd7 9. Qc2 Qe7 10. Nh4 c6 |
| 1933 BCF Ch 26th – Round 5 – Cross, Alfred Rupert Neale – 0-1 – Thomas, George Alan – G12 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb4+ 5. Bd2 Bxd2+ 6. Qxd2 Bb7 7. Bg2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Nxe4 Bxe4 |
| 1933 Folkestone Olympiad V – Round 10.8 – Lilienthal, Andor – 1-0 – Combe, Robert F – G34 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 Qe7 8. Nc3 Ne4 9. Qc2 Nxc3 10. Qxc3 O-O |
| 1933 Leningrad ch-URS – Round 1 – Alatortsev, Vladimir N. – 1-0 – Bohatyrchuk, Fedir Parfenovych – G31 1. d4 Nf6 2. Nf3 e6 3. g3 b6 4. c4 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Qc2 O-O 10. Nc3 Qe7 |
| 1933 Moravska Ostrava – Round ? – Gruenfeld, Ernst – 1-0 – Gilg, Karl – G27 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 O-O 9. Qc2 Nbd7 10. e4 c5 |
| 1934 Sitges – Round 12 – Cherta, Pedro – 0-1 – Rey Ardid, Ramon – G67 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Ne4 9. Nxe4 Bxe4 10. O-O O-O |
| 1935 Warsaw POL – Round 13 – Makarczyk, Kazimierz – 1/2-1/2 – Danielsson, Goesta – G78 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Qc2 O-O 10. Nc3 Qe7 |
| 1936 Mar del Plata – Round 15 – Guimard, Carlos E – 1/2-1/2 – Letelier Martner, Rene – G105 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Qc2 Nbd7 9. Nc3 O-O 10. O-O Qe7 |
| 1937 Hastings3738 – Round 5 – Reshevsky, Samuel – 1-0 – Thomas, George Alan – G17 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Qc2 Qc8 10. Nc3 O-O |
| 1938 Bad Oeynhausen – Round 5 – Becker, Albert – 1-0 – Engels, Ludwig – G41 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Bxd2+ 5. Qxd2 b6 6. g3 Bb7 7. Bg2 d6 8. Nc3 Nbd7 9. Qc2 O-O 10. O-O Re8 |
| 1938 Ch (Men) Argentina ARG – Round 6 – Guimard, Carlos E – 1-0 – Nogues Acuna, Alejandro – G5 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Qc2 Nxc3 |
| 1939 Bad Oeynhausen ch-GER – Round 12 – Gilg, Karl – 1-0 – Kohler, Alfred – G84 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Nbd7 9. Qc2 O-O 10. O-O Qe7 |
| 1939 SCO-ch52/ – Round 4 – Pavey, Max – 1/2-1/2 – Winter, William – G8 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb4+ 5. Bd2 Bxd2+ 6. Qxd2 Bb7 7. Bg2 Qc8 8. Nc3 d5 9. cxd5 Nxd5 10. O-O O-O |
| 1939 Stuttgart – Round 7 – Vidmar, Marjeta – 1/2-1/2 – Kieninger, Georg – G39 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Ne4 9. Qf4 Nf6 10. O-O O-O |
| 1942 Sao Paulo – Round ? – De Souza Mendes, Joao – 1-0 – Moses Jaime – G12 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 Ne4 8. Qf4 Qc8 9. d5 Nf6 10. e4 exd5 |
| 1945 Ljubljana – Round 1 – Pirc, Vasja – 1/2-1/2 – Vidmar Milan – G1 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Ne4 9. Qc2 Nxc3 10. Qxc3 Be4 |
| 1946 Barcelona – Round 5 – Vilardebo, Jose – 1/2-1/2 – Golmayo Torriente, Manuel – G30 1. d4 e6 2. c4 Nf6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 Ne4 8. Qc2 f5 9. Nc3 Nxc3 10. Qxc3 O-O |
| 1946 Zaanstreek – Round 8 – Ekstrom, Folke – 1-0 – Znosko-Borovsky, Eugene – G38 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 Qc8 8. O-O O-O 9. Nc3 d6 10. Qc2 Nbd7 |
| 1948 Karlovy Vary – Round 12 – Vidmar, Marjeta – 0-1 – Steiner, Laszlo – G123 1. Nf3 Nf6 2. c4 e6 3. d4 b6 4. g3 Bb4+ 5. Bd2 Bxd2+ 6. Qxd2 Bb7 7. Bg2 Ne4 8. Qf4 f5 9. Ne5 d6 10. Nd3 Qf6 |
| 1948 Moskou ch-URS – Round 1 – Aronin, Lev – 1/2-1/2 – Ilivitsky, Georgy A – G12 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Qc2 Nxc3 |
| 1949 Vienna – Round 3 – Kottnauer, Cenek – 1-0 – Galia, K. – G14 1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. d4 e6 5. c4 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Ne4 9. Qf4 Nxc3 10. Ng5 f6 |
| 1954 Kiev ch-URS – Round 1 – Kholmov, Ratmir D – 1-0 – Livshin, Iosif – G61 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O O-O 9. Nc3 Nbd7 10. Rfe1 Ne4 |
| 1954 Olympiad final A – Round 11 – Golombek, Harry – 1/2-1/2 – Bobotsov, Milko G – G116 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Nbd7 9. O-O Ne4 10. Qc2 Nxc3 |
| 1955 Hamburg – Round 10 – Teschner, Rudolf – 1/2-1/2 – Rellstab, Ludwig – G75 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Bxd2+ 5. Qxd2 b6 6. g3 Bb7 7. Bg2 d6 8. O-O O-O 9. Nc3 Ne4 10. Qc2 Nxc3 |
| 1960 BUL-ch14 Sofia BUL – Round 13 – Milev, Zdravko – 1/2-1/2 – Bobotsov, Milko G – G50 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Nxe4 Bxe4 |
| 1966 Hoogovens – Round 9 – Nei, Iivo – 1-0 – Bobotsov, Milko G – G44 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Ne4 9. Qf4 Nf6 10. O-O Nbd7 |
| 1966 Santa Monica – Round 1 – Ivkov, Borislav – 1-0 – Larsen, Benjamin Holsko – G4 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 O-O 9. Nh4 Bxg2 10. Nxg2 e5 |
| 1967 Sochi – Round 1 – Lengyel, Laszlo – 1/2-1/2 – Langeweg, Kick – G8 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 O-O 9. O-O Ne4 10. Nxe4 Bxe4 |
| 1967 Sochi – Round 3 – Damjanovic, Marko – 1/2-1/2 – Flesch, Janos – G34 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 O-O 9. O-O Ne4 10. Nxe4 Bxe4 |
| 1967 Vrnjacka Banja zt – Round 16 – Lengyel, Laszlo – 1/2-1/2 – Ivkov, Borislav – G111 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb4+ 5. Bd2 Bxd2+ 6. Qxd2 Bb7 7. Bg2 d6 8. Nc3 Ne4 9. Nxe4 Bxe4 10. O-O Nd7 |
| 1968 IBM I – Round 7 – Lengyel, Laszlo – 1/2-1/2 – Ivkov, Borislav – G25 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Nxe4 Bxe4 |
| 1969 Luhacovice – Round 1 – Kozma, Julius – 1/2-1/2 – Lengyel, Agnes – G6 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Nxe4 Bxe4 |
| 1969 POL-SVE – Round 2.8 – Balcerowski, Witold – 1/2-1/2 – Hjorth, Sune – G13 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. O-O Nbd7 9. Nc3 Ne4 10. Nxe4 Bxe4 |
| 1969 Venice – Round 15 – Hort, Vlastimil – 1/2-1/2 – Lengyel, Levente – G92 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 Ne4 9. Nxe4 Bxe4 10. O-O Nd7 |
| 1969 Vidmar Memorial – Round 1 – Bajec, Borut – 1/2-1/2 – Unzicker, Ferdinand, Dr. – G2 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Nc3 O-O 9. O-O Nbd7 10. Qc2 Qe7 |
| World Rapid 2019 – Round 2.46 – Tomashevsky, Evgeny – 1/2-1/2 – Salgado Lopez, Ivan – G117 1. c4 b6 2. d4 e6 3. Nf3 Bb7 4. g3 Bb4+ 5. Bd2 Bxd2+ 6. Qxd2 Nf6 7. Bg2 d6 8. O-O Nbd7 9. Qc2 Be4 10. Qa4 O-O |
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