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A56x — Czech (1938)
1.d4 Nf6 2.c4 c5 3.d5 e5 4.Nc3 d6 5.e4 Be7 6.Nf3 O-O 7.Be2
Les coups candidats
7…Ne8 — 50.5% (398 parties)
Ambassadeurs : Fedder, Steen (4x), Ree, Hans (3x), Bakheet Farag (3x), Hort, Vlastimil (2x), Malich, Burkhard, Dr. (2x), Meyer, Claus Dieter (2x), Plachetka, Jan (2x), Adlin Merlin (2x)
7…Nbd7 — 27.2% (214 parties)
Ambassadeurs : Jansa, Vlastimil (8x), Brinck-Claussen, Bjorn (4x), Kozma, Julius (3x), Norgaard, Jesper (3x), Ost-Hansen, Jacob (3x), Sanguinetti, Ricardo (2x), Gralka, Julian (2x), Bannik, Anatolij (2x)
7…Na6 — 7.6% (60 parties)
Ambassadeurs : Jensen, Camilla Hinge (2x), Woehlert, Lutz (1x), Espig, Lutz (1x), Whiteley, Andrew Jonathan (1x), Ostojic, Vladimir (1x), Murey, Jacob (1x), Lebedev, Boris (1x), Csom, Istvan (1x)
7…a6 — 6.9% (54 parties)
Ambassadeurs : Ciocaltea, Victor (2x), Piket, Marcel (2x), Deze, Anton (2x), Rakic, Tomislav (2x), Blees, Albert (2x), Kurtesch, Laszlo (1x), Gasztonyi, Endre (1x), Bobotsov, Milko G (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 7…Ne8 7…Nbd7 7…Na6 7…a6
<1800 44 52% 30% 5% 5%
1800-2200 285 51% 25% 10% 8%
2200-2600 333 48% 32% 6% 7%
Évolution par décennie (% des parties)
Décennie N parties 7…Ne8 7…Nbd7 7…Na6 7…a6
1950s 6 67% 17% — —
1960s 66 48% 38% 5% 8%
1970s 48 56% 40% 4% —
1980s 79 47% 25% 5% 14%
1990s 170 56% 22% 7% 4%
2000s 217 51% 26% 10% 5%
2010s 181 45% 27% 8% 12%
2020s 21 52% 29% 10% —
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
7…Ne8 45% 52% ▲ +7.6%
7…Nbd7 27% 29% ▲ +2.1%
7…Na6 8% 10% ▲ +1.2%
7…a6 12% 0% ▼ -11.6%
Parties historiques
7…Ne8 — 50.5% (398 parties)
1957 — Nuzhdin, N vs Golubev, Vladimir — 1-0 — ?
1957 — Rosse, Jack Dennis vs Rosselson, Leon — 0-1 — Bognor Regis
1957 — Casas Perea, Fernando vs Rossetto, Hector — 0-1 — Mar del Plata ARG
1958 — Eken, Max vs Milic, Borislav — 1-0 — Beverwijk NED
1960 — Fraidakis, Pantelis vs Piskov, Kamen — 0-1 — BUL-ch14 Sofia BUL
7…Nbd7 — 27.2% (214 parties)
1957 — Aperador Rubio, Ricardo vs Engels, Ludwig — 0-1 — Rio de Janeiro BRA
1961 — Donner, Jan-Hein vs Langeweg, Kick — 1-0 — The Hague ch-NLD
1964 — Alexander Vivasvaan Chandra vs Bannik, Anatolij — 1-0 — ?
1965 — Uhlmann, Wolfgang vs Vasiukov, Evgeni — 1/2-1/2 — Hastings ENG
1966 — Malich, Burkhard, Dr. vs Jansa, Vlastimil — 1-0 — Havana olm
7…Na6 — 7.6% (60 parties)
1963 — Murey, Jacob vs Lebedev, Boris — 1/2-1/2 — Moscow RUS
1965 — Whiteley, Andrew Jonathan vs Ostojic, Vladimir — 1-0 — EU-ch U20 Groningen NED
1969 — Woehlert, Lutz vs Espig, Lutz — 1-0 — ?
1971 — Bukhtin, Vladimir S vs Ivlev, Valentin — 1-0 — Moscow RUS
1975 — Knaak, Rainer vs Boensch, Uwe — 1-0 — Stralsund GER
7…a6 — 6.9% (54 parties)
1964 — Uhlmann, Wolfgang vs Johannessen, Svein — 1-0 — Tel Aviv olm
1966 — Kurtesch, Laszlo vs Gasztonyi, Endre — 1-0 — Budapest HUN
1966 — Bobotsov, Milko G vs Ciocaltea, Victor — 1/2-1/2 — Reggio Emilia ITA
1967 — Kristinsson, Jon vs Ciocaltea, Victor — 1/2-1/2 — Halle GER
1967 — Aradi, Virag vs Szekely, Sandor — 0-1 — Hungary CCC-8