D66b - 8…a6 - Orthodox Main Line

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D66b — Orthodox Main Line
1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 a6
Les coups candidats
9.O-O — 38.3% (129 parties)
Ambassadeurs : Guimard, Carlos E (4x), Yates, Frederic D (3x), Gligorić, Svetozar (3x), Vidmar, Milan Sr (2x), Bobotsov, Milko G (2x), Bolbochan, J. (2x), Schwarzburger, Lothar (2x), Illescas Cordoba, Miguel (2x)
9.cxd5 — 26.7% (90 parties)
Ambassadeurs : Euwe, Max (5x), Rubinstein, Akiba (4x), Palau, Luis (3x), Michell, Reginald (3x), Luckis, Marcos (3x), Gruenfeld, Ernst (2x), Yates, Frederic D (2x), Bogoljubow, Efim (2x)
9.c5 — 15.4% (52 parties)
Ambassadeurs : Izeta Txabarri, Felix (2x), Mikenas, Alius (1x), Garcia Vera, Romeo (1x), Euwe, Max (1x), Spielmann, Rudolf (1x), Amado, Claudio (1x), Foguelman (1x), Schulien, Charles (1x)
9.a4 — 8.6% (29 parties)
Ambassadeurs : Kuligowski, Adam (3x), Euwe, Max (1x), Sergeant, Edward (1x), Levenfish, Grigory (1x), Riumin, Nikolai (1x), Demetriescu Th (1x), Razinger, Igor (1x), Farago, Ivan (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 9.O-O 9.cxd5 9.c5 9.a4
<1800 4 — 25% 50% 25%
1800-2200 88 51% 19% 12% 9%
2200-2600 119 31% 24% 23% 12%
2600+ 10 30% 20% 20% 10%
Évolution par décennie (% des parties)
Décennie N parties 9.O-O 9.cxd5 9.c5 9.a4
1920s 15 7% 73% 7% —
1930s 31 23% 55% 3% 6%
1940s 12 50% 42% — 8%
1950s 6 50% 50% — —
1960s 9 67% 11% — —
1970s 14 14% 21% 21% 21%
1980s 27 19% 41% 30% 7%
1990s 72 47% 15% 21% 4%
2000s 86 43% 14% 16% 12%
2010s 57 47% 25% 12% 11%
2020s 8 12% 25% 38% 25%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9.O-O 47% 12% ▼ -34.9%
9.cxd5 25% 25% +0.4%
9.c5 12% 38% ▲ +25.2%
9.a4 11% 25% ▲ +14.5%
Joueurs célèbres
Champions du monde dans cette position
Euwe, Max — 8 parties
Alekhine, Alexander — 1 partie
Parties historiques
9.O-O — 38.3% (129 parties)
1923 — Padulli, Giuseppe vs Guarini, Carlo — 1-0 — Trieste
1930 — Vidmar, Milan Sr vs Yates, Frederic D — 0-1 — San Remo ITA
1930 — Vidmar, Marjeta vs Yates, Frederic D — 0-1 — San Remo ITA
1930 — Vidmar, Milan Sr vs Yates, Frederic D — 0-1 — San Remo ITA
1932 — Euwe, Max vs Spielmann, Rudolf — 1/2-1/2 — Amsterdam NED
9.cxd5 — 26.7% (90 parties)
1920 — Gruenfeld, Ernst vs Fiebig, Paul — 1-0 — ?
1924 — Straat, Evert vs Kersten, J L — 1-0 — Amsterdam NED
1925 — Alekhine, Alexander vs Yates, Frederic D — 1-0 — Baden-Baden GER
1925 — Saemisch, Friedrich vs Bogoljubow, Efim — 0-1 — Moscow RUS
1926 — Goldstein, Alexander vs Michell, Reginald — 0-1 — England
9.c5 — 15.4% (52 parties)
1923 — Euwe, Max vs Spielmann, Rudolf — 0-1 — Maehrisch Ostrau
1939 — Mikenas, Alius vs Garcia Vera, Romeo — 1/2-1/2 — Rosario ARG
1975 — Reshevsky, Samuel vs Lombardy, William J — 1/2-1/2 — Oberlin, OH USA
1976 — Amado, Claudio vs Foguelman — 1-0 — Buenos Aires ch-ARG
1979 — Lukacs, Peter vs Zoltek, Tadeusz — 1/2-1/2 — Lodz POL
9.a4 — 8.6% (29 parties)
1933 — Demetriescu Th vs Razinger, Igor — 1/2-1/2 — ?
1934 — Levenfish, Grigory vs Riumin, Nikolai — 1/2-1/2 — Leningrad ch-URS
1945 — Euwe, Max vs Sergeant, Edward — 1-0 — Hastings ENG
1978 — Kuligowski, Adam vs Byrne, Robert E — 1-0 — Buenos Aires ARG
1978 — Kuligowski, Adam vs Byrne, Ray — 1-0 — Buenos Aires olm