E55b - 9.a3 - Main Line, Bronstein (1956)

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E55b — Main Line, Bronstein (1956)
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O dxc4 8.Bxc4 Nbd7 9.a3
Les coups candidats
9…cxd4 — 60.9% (532 parties)
Ambassadeurs : Kholmov, Ratmir D (9x), Gipslis, Aivars (5x), Tal, Mikhail (5x), Aadhitha Karikalan (5x), Lukacs, Peter (5x), Andersson, Ulf (4x), Sapi, Laszlo (4x), Ribli, Zoltan (4x)
9…Ba5 — 25.5% (223 parties)
Ambassadeurs : Adams, Michael (6x), Almasi, Zoltan (5x), Korobov, Anton (3x), Schmidt, Loren R (3x), Gormally, Daniel W (3x), Miguel, Nahuel (2x), Jobava, Baadur (2x), Ehlvest, Jaan (2x)
9…Bxc3 — 13.4% (117 parties)
Ambassadeurs : Rapaka Samuel Paul (2x), Bisguier, Arthur B (2x), Le Roux, Jean-Pierre (2x), Sevian, Samuel (2x), Timofejeva, Lidija (1x), Keller-Hermann, Edith (1x), Cherepkov, Alexander V (1x), Zilber, Israel (1x)
9…Bxa3 — 0.1% (1 parties)
Ambassadeurs : Hoang, Thi Bao Tram (1x), Kosteniuk, Alexandra (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 9…cxd4 9…Ba5 9…Bxc3 9…Bxa3
<1800 32 59% 22% 19% —
1800-2200 204 62% 23% 15% —
2200-2600 432 58% 30% 12% 0%
2600+ 55 47% 40% 13% —
Évolution par décennie (% des parties)
Décennie N parties 9…cxd4 9…Ba5 9…Bxc3 9…Bxa3
1950s 41 80% 5% 15% —
1960s 42 76% 17% 7% —
1970s 44 93% 7% — —
1980s 29 83% 10% 7% —
1990s 55 75% 7% 18% —
2000s 262 65% 26% 9% 0%
2010s 358 49% 35% 16% —
2020s 42 36% 26% 38% —
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9…cxd4 49% 36% ▼ -13.4%
9…Ba5 35% 26% ▼ -9.0%
9…Bxc3 16% 38% ▲ +22.5%
9…Bxa3 0% 0% +0.0%
Joueurs célèbres
Champions du monde dans cette position
Tal, Mikhail — 5 parties
Anand, Viswanathan — 4 parties
Kramnik, Vladimir — 2 parties
Carlsen, Magnus — 2 parties
Botvinnik, Mikhail — 1 partie
Kasparov, Garry — 1 partie
Parties historiques
9…cxd4 — 60.9% (532 parties)
1953 — Sherwin, James T vs Ivkov, Borislav — 1-0 — Copenhagen DEN
1953 — Keres, Paul Petrovich vs Eken, Max — 1/2-1/2 — Zurich SUI
1955 — Averbakh, Yuri L vs Botvinnik, Mikhail — 1/2-1/2 — ?
1955 — Foldi, Jozsef vs Sahlberg, Erkki — 1-0 — Lyon FRA
1956 — Pla, Orlando vs Weichselbaumer, Ernst — 1/2-1/2 — Moskou olm
9…Ba5 — 25.5% (223 parties)
1958 — Osnos, Viatcheslav vs Alexander G — 1-0 — Tashkent ch URS sf
1958 — Gurgenidze, Bukhuti vs Handel, Horst — 1/2-1/2 — Varna BUL
1960 — Reinhardt, Enrique vs Bolbochan, Julio — 0-1 — Sao Paulo BRA
1960 — Lutikov, Anatoly S vs Nezhmetdinov, Rashid — 1/2-1/2 — Perm RUS
1965 — Herzog, Franz vs Koester, Hans Dieter — 0-1 — Kiel GER
9…Bxc3 — 13.4% (117 parties)
1956 — Niemela, Ilmari Aarne vs Ljungquist, Leif — 0-1 — olm Moscow RUS
1957 — Timofejeva, Lidija vs Keller-Hermann, Edith — 0-1 — Emmen
1957 — Cherepkov, Alexander V vs Zilber, Israel — 1-0 — Leningrad RUS
1957 — Rapaka Samuel Paul vs Bisguier, Arthur B — 1-0 — m
1957 — Rapaka Samuel Paul vs Bisguier, Arthur B — 1-0 — New York, NY USA
9…Bxa3 — 0.1% (1 parties)
2008 — Hoang, Thi Bao Tram vs Kosteniuk, Alexandra — 1-0 — Beijing CHN