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B28d — O’Kelly (1926)
1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Nxd4
Les coups candidats
Ambassadeurs : Zalys, Ignas (37x), Collins, Richard (32x), Bakalar, Jan (23x), Skorobogatykh, Andrey (14x), Frey, Walter (13x), Borda, Lajos (13x), Schweber, Samuel (10x), Biebinger, Holger (8x)
4…e5 — 14.3% (1191 parties)
Ambassadeurs : Owens, Megan R (6x), Gauche, Charles (6x), Nguyen, Duc Hoa (5x), Reiter, Laszlo (5x), Peltanova, Zuzana (4x), Paraskevaidis, Vasilios (4x), Tran Thi Kim Loan (4x), Maksimovic, Suzana (4x)
Ambassadeurs : Helin, Mikael (11x), Blackstone, John (4x), Spacek, Oliver (4x), Ulrich, Peter (3x), Ahmed Abdul Hannan Jawad (3x), Grawe, Herbert (2x), Kunz, Konstantin (2x), ? (2x)
Ambassadeurs : Jonas, Zsolt (4x), Krekoten, Vladimir (3x), Vandivier, Don L (2x), Hoppe, Sven (2x), Vogelhuber, Annett (2x), Valencia Escobar, Dario (2x), Moissl, Richard (1x), Glosse, Jochen (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 4…Nf6 4…e5 4…e6 4…d6
<1800 1218 72% 15% 4% 3%
1800-2200 4482 75% 14% 4% 3%
2200-2600 931 80% 14% 3% 1%
2600+ 3 67% 33%
Évolution par décennie (% des parties)
Décennie N parties 4…Nf6 4…e5 4…e6 4…d6
1950s 97 88% 6% 3%
1960s 199 82% 10% 6%
1970s 130 88% 7% 4%
1980s 192 81% 10% 2% 2%
1990s 1241 76% 15% 3% 2%
2000s 2814 74% 15% 4% 3%
2010s 2920 73% 15% 5% 4%
2020s 743 77% 15% 3% 2%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
4…Nf6 73% 77% ▲ +4.3%
4…e5 15% 15% +0.2%
4…e6 5% 3% ▼ -1.7%
4…d6 4% 2% ▼ -1.9%
Joueurs célèbres
Champions du monde dans cette position
Hou, Yifan — 3 parties
Tal, Mikhail — 1 partie
Kasparov, Garry — 1 partie
Parties historiques
4…Nf6 — 74.9% (6246 parties)
1950 — Ivkov, Borislav vs Van den Berg, Carel B — 1-0 — Utrecht NED
1950 — Smyslov, Vasily vs Mueller, Hans — 1-0 — Venice ITA
1950 — Poulsen, Christian vs O'Kelly, Albéric de Galway — 0-1 — Dubrovnik olm
1950 — Koch, Wolfgang Max, Dr. vs Eken, Max — 0-1 — Berlin GER
1951 — von Saldern, Ruediger vs Musmann, Lothar — 0-1 — Leipzig GER
4…e5 — 14.3% (1191 parties)
1950 — Penrose, Jonathan vs Tartakower, Savielly — 1-0 — Southsea ENG
1951 — Michel, Paul vs Mueller, Hans — 1/2-1/2 — Vienna AUT
1954 — Pedersen, Eigil vs Solin, Ilmari — 1/2-1/2 — Prague zt Prague CZE
1956 — Rubtsova, Olga vs Rudenko, Ludmila — 1-0 — Moscow RUS
1959 — Milic, Borislav vs Taimanov, Mark — 0-1 — Kiev UKR
4…e6 — 4.0% (333 parties)
1958 — Yanofsky, Daniel Abraham vs Raizman, Maurice — 1/2-1/2 — Munchen olm
1958 — Balduzzi, Reynaldo vs Cruz, Raul C. — 1-0 — Buenos Aires ARG
1959 — Barry Dickson vs March, Atlegang — 1-0 — Providence, RI USA
1960 — Yee Jim vs Blackstone, John — 0-1 — Sonoma, CA
1960 — Dommeyer, Carl vs Blackstone, John — 0-1 — Campbell, CA
4…d6 — 2.9% (244 parties)
1980 — Van Parreren, Hanneke vs Van der Giessen, Ada Leona — 0-1 — Mijdrecht
1985 — Andersen, Erik vs Molgard, K. — 1-0 — Esbjerg DEN
1988 — Moissl, Richard vs Glosse, Jochen — 1/2-1/2 — ?
1991 — Avaria, J. vs Everet, D. — 1/2-1/2 — Mamaia
1992 — Haugen, Arild vs Lauvsnes, Arild — 0-1 — Fister