B28a — O’Kelly Variation
1.e4 c5 2.Nf3 a6
Eval: [+0.39]
Les coups candidats
Ambassadeurs : Zalys, Ignas (41x), Collins, Richard Arnold (34x), Borda, Lajos (19x), Bakalar, Jan (19x), Damia, Angelo (17x), Frey, Walter (16x), Gerhardt, Peter-Michael (16x), Morilla Morilla, Candido (15x)
Ambassadeurs : Csom, Istvan (44x), Borda, Lajos (27x), Kurajica, Bojan (27x), Green, Michael (26x), Ackermann, Hans Werner (25x), Durán Vallverdú, Joan (25x), Analiev, Dimitar (20x), Nestorovic, Nikola (17x)
Ambassadeurs : Csom, Istvan (29x), Franklin, Michael J (23x), Vasilevich, Tatjana (21x), Borda, Lajos (18x), Ardeleanu, Alin (16x), Manak, Jozef (15x), Cordova, Emilio (14x), Green, Michael (14x)
Ambassadeurs : Csom, Istvan (18x), Bakalar, Jan (10x), Zuluaga Mancilla, Cesar (10x), Tu, Hoang Thai (9x), Vasilevich, Tatjana (9x), Franklin, Michael J (8x), Kurajica, Bojan (8x), Karimov, Farukh (8x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 3.d4 3.c3 3.c4 3.Nc3
<1800 1402 50% 20% 10% 9%
1800-2200 11579 34% 25% 22% 9%
2200-2600 7896 13% 35% 28% 15%
2600+ 117 3% 51% 21% 6%
Évolution par décennie (% des parties)
Décennie N parties 3.d4 3.c3 3.c4 3.Nc3
1850s 2 50%
1900s 1 100%
1910s 2 50%
1920s 7 86% 14%
1930s 4 25%
1940s 28 39% 11% 36% 4%
1950s 248 42% 19% 24% 7%
1960s 537 41% 23% 16% 12%
1970s 481 29% 24% 25% 14%
1980s 726 28% 29% 23% 11%
1990s 3489 37% 22% 21% 9%
2000s 8033 35% 24% 20% 11%
2010s 9965 30% 28% 21% 11%
2020s 3033 17% 33% 30% 9%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
3.d4 30% 17% ▼ -12.5%
3.c3 28% 33% ▲ +4.6%
3.c4 21% 30% ▲ +8.8%
3.Nc3 11% 9% ▼ -2.2%
Joueurs célèbres
Champions du monde dans cette position
Hou, Yifan — 10 parties
Euwe, Max — 9 parties
Tal, Mikhail — 9 parties
Carlsen, Magnus — 5 parties
Ju, Wenjun — 4 parties
Karpov, Aleksandr — 2 parties
Kasparov, Garry — 2 parties
Smyslov, Vladimir — 1 partie
Karpov, Anatoly — 1 partie
Anand, Viswanathan — 1 partie
Parties historiques
3.d4 — 31.4% (8330 parties)
1858 — Cochrane, John Miles vs Somacarana — 1-0 — Calcutta IND
1905 — Koehler, Gustav Henschel vs Marshall, Frank — 0-1 — New York, NY USA
1911 — Hromadka, Karel vs Hafe — 1-0 — Cologne GER
1921 — Spielmann, Rudolf vs Tartakower, Savielly — 1-0 — Vienna m1 Vienna AUT
1921 — Spielmann, Rudolf vs Tartakower, Savielly — 1-0 — Vienna AUT
3.c3 — 26.4% (7019 parties)
1949 — Foltys, Jan vs Prins, Lodewijk — 1/2-1/2 — Venice ITA
1949 — Schifferdecker, Wilhelm vs Euwe, Max — 1-0 — Wiesbaden GER
1949 — Simagin, Vladimir vs Barcza, Gedeon — 1/2-1/2 — Budapest HUN
1950 — Unzicker, Wolfgang vs Beni, Alfred — 1-0 — Dubrovnik CRO
1950 — Pachman, Ludek vs Mueller, Hans — 1-0 — Venice ITA
3.c4 — 21.7% (5764 parties)
1922 — Euwe, Max vs Tartakower, Savielly — 0-1 — London ENG
1945 — Haberditz, Hans vs Rautenberg, Wilhelm — 1-0 — Vienna AUT
1947 — Taimanov, Mark vs Kuzminykh, Evgeny — 1-0 — Leningrad RUS
1947 — Radojcic, Miroslav vs Tot, Bora — 0-1 — Ljubljana
1948 — Acebey Michel, Veroska vs O'Kelly de Galway, Alberic — 1/2-1/2 — Buenos Aires ARG
3.Nc3 — 10.7% (2844 parties)
1949 — Fletzer, Gino vs Rossolimo, Nicolas — 0-1 — Venice ITA
1950 — Paoli, Enrico vs Tot, Bora — 1/2-1/2 — Vienna AUT
1950 — Rossolimo, Nicolas vs Steiner, Heinrich Jun. — 1-0 — Venice ITA
1951 — Eastman, George vs Martin, Raymond — 1-0 — Fort Worth, TX USA
1951 — Medina-Garcia, Antonio vs Fuentes Garcia, Juan Manuel — 0-1 — Madrid ESP