E55b - 9.a3 - Main Line Bronstein

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E55b — Main Line Bronstein
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
Eval: [+0.23]
Les coups candidats
9…cxd4 — 61.1% (527 parties)
Ambassadeurs : Kholmov, Ratmir D (9x), Lukacs, Peter (7x), Farago, Ivan (7x), Gipslis, Aivars (5x), Andersson, Ulf (5x), Macieja, Bartlomiej (5x), Sciarretta, Robert W (5x), Junge, Wolfgang (5x)
9…Ba5 — 25.5% (220 parties)
Ambassadeurs : Van der Stricht, Geert (7x), Adams, Michael (6x), Aleksandrov Ivanchev, Aleksandar (4x), Korobov, Anton (4x), Almási, Zoltán (3x), Schmidt, Loren R (3x), Gormally, Daniel W (3x), Najdorf, Miguel (2x)
9…Bxc3 — 13.3% (115 parties)
Ambassadeurs : Reshevsky, Samuel (2x), Bisguier, Arthur B (2x), Lenic, Luka (2x), Le Roux, Jean-Pierre (2x), Sevian, Samuel (2x), Timofejeva, Lidija (1x), Keller-Hermann, Edith (1x), Niemela, Antti (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 8 62% — 38% —
1800-2200 167 64% 20% 16% —
2200-2600 461 57% 30% 12% 0%
2600+ 58 48% 40% 12% —
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 28 82% 11% 7% —
1990s 54 74% 7% 19% —
2000s 260 65% 26% 9% 0%
2010s 356 49% 35% 16% —
2020s 38 37% 26% 37% —
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9…cxd4 49% 37% ▼ -12.6%
9…Ba5 35% 26% ▼ -8.5%
9…Bxc3 16% 37% ▲ +21.1%
9…Bxa3 0% 0% +0.0%
Joueurs célèbres
Champions du monde dans cette position
Tal, Mikhail — 4 parties
Anand, Viswanathan — 4 parties
Carlsen, Magnus — 2 parties
Euwe, Max — 1 partie
Botvinnik, Mikhail — 1 partie
Smyslov, Vladimir — 1 partie
Kramnik, Vladimir — 1 partie
Parties historiques
9…cxd4 — 61.1% (527 parties)
1953 — Keres, Paul Petrovich vs Euwe, Max — 1/2-1/2 — Zurich SUI
1953 — Sherwin, James T vs Ivkov, Borislav — 1-0 — Copenhagen DEN
1955 — Foldi, Jozsef vs Sahlberg, Erkki — 1-0 — Lyon FRA
1955 — Averbakh, Yuri L vs Botvinnik, Mikhail — 1/2-1/2 — ?
1956 — Petrosian, Tigran A. vs Djurasevic, Bozidar — 1/2-1/2 — Belgrade SRB
9…Ba5 — 25.5% (220 parties)
1958 — Gurgenidze, Bukhuti vs Handel, Horst — 1/2-1/2 — Varna BUL
1958 — Osnos, Viatcheslav vs Grushevsky, Alexander — 1-0 — Tashkent ch URS sf
1960 — Lutikov, Anatoly S vs Nezhmetdinov, Rashid — 1/2-1/2 — Perm RUS
1960 — Reinhardt, Enrique vs Bolbochan, J. — 0-1 — Sao Paulo BRA
1965 — Herzog, Franz vs Koester, Hans Dieter — 0-1 — Kiel GER
9…Bxc3 — 13.3% (115 parties)
1956 — Niemela, Antti vs Lungkvist L — 0-1 — olm Moscow RUS
1957 — Timofejeva, Lidija vs Keller-Hermann, Edith — 0-1 — Emmen
1957 — Reshevsky, Samuel vs Bisguier, Arthur B — 1-0 — m
1957 — Reshevsky, Samuel vs Bisguier, Arthur B — 1-0 — New York, NY USA
1957 — Cherepkov, Alexander V vs Zilber, Israel — 1-0 — Leningrad RUS
9…Bxa3 — 0.1% (1 parties)
2008 — Hoang, Thi Bao Tram vs Kosteniuk, Alexandra — 1-0 — Beijing CHN