E56d - 8.a3 Ba5 - Main Line (1939)

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E56d — Main Line
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O Nc6 8.a3 Ba5
Les coups candidats
Ambassadeurs : Tal, Mikhail (5x), Mason, Ian J (5x), Cherepkov, Alexander V (4x), Kinnmark, Ove (4x), Landa, Konstantin (4x), Szabo, Laszlo (3x), Kozma, Julius (3x), Gligorić, Svetozar (3x)
9.h3 — 20.1% (112 parties)
Ambassadeurs : Krogius, Nikolai V (3x), Mason, Ian J (3x), Potkin, Vladimir (3x), Saiyn, Zhanat (3x), Peralta, Fernando (3x), Cherepkov, Alexander V (2x), Korchnoi, Viktor (2x), Reshevsky, Samuel (2x)
9.Ne2 — 14.5% (81 parties)
Ambassadeurs : Kashlinskaya, Alina (4x), Krogius, Nikolai V (3x), Kozma, Julius (3x), Spassky, Boris V. (3x), Khodos, German (2x), Petrosian, Tigran V. (1x), Tolush, Alexander V (1x), Petrosian, Tigran A. (1x)
9.dxc5 — 7.0% (39 parties)
Ambassadeurs : Mega IV (3x), ? (3x), Lim, Seng Hoo (2x), Bykov, Vladimir (1x), Cherepkov, Alexander V (1x), Uhlmann, Wolfgang (1x), Minev, Nikolay N (1x), Delmar, Gabriel (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 9.cxd5 9.h3 9.Ne2 9.dxc5
<1800 4 25% — 25% 25%
1800-2200 104 58% 14% 12% 12%
2200-2600 278 43% 27% 15% 5%
2600+ 24 42% 29% 8% 8%
Évolution par décennie (% des parties)
Décennie N parties 9.cxd5 9.h3 9.Ne2 9.dxc5
1930s 2 50% — — —
1950s 41 59% 12% 15% 7%
1960s 47 55% 15% 19% 2%
1970s 31 55% 6% 29% 6%
1980s 38 61% 13% 11% 11%
1990s 40 55% 10% 20% 5%
2000s 109 43% 22% 15% 8%
2010s 236 47% 27% 12% 6%
2020s 13 54% 8% 8% 23%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9.cxd5 47% 54% ▲ +6.4%
9.h3 27% 8% ▼ -19.4%
9.Ne2 12% 8% ▼ -4.2%
9.dxc5 6% 23% ▲ +16.7%
Joueurs célèbres
Champions du monde dans cette position
Tal, Mikhail — 5 parties
Smyslov, Vladimir — 1 partie
Botvinnik, Mikhail — 1 partie
Hou, Yifan — 1 partie
Parties historiques
9.cxd5 — 50.1% (279 parties)
1939 — Landau, Salo vs Flohr, Salo — 1-0 — Bournemouth
1950 — Balogh, Janos vs Cuadrado Pastor, Antonio — 1/2-1/2 — ICCF
1951 — Petrosian, Tigran A. vs Bannik, Anatolij — 1-0 — Tbilisi GEO
1951 — Bronstein, David I vs Aarland, Stein Arild — 1/2-1/2 — Moskou ch-URS
1951 — Novotelnov, Nikolai vs Smyslov, Vladimir — 1-0 — Moskou ch-URS
9.h3 — 20.1% (112 parties)
1952 — Kuzminykh, Evgeny vs Khasin, Abram — 1-0 — Leningrad RUS
1955 — Reshevsky, Samuel vs Sandrin, Albert — 1-0 — Long Beach, CA USA
1956 — Reshevsky, Samuel vs Evans, Larry — 1-0 — New York, NY USA
1958 — Osnos, Viatcheslav vs Rubel, Igor G — 1-0 — Leningrad RUS
1958 — Korchnoi, Viktor vs Vladimirov, Boris T — 1-0 — Tashkent UZB
9.Ne2 — 14.5% (81 parties)
1950 — Gligorić, Svetozar vs Reshevsky, Samuel — 1/2-1/2 — Radio
1951 — Petrosian, Tigran V. vs Tolush, Alexander V — 0-1 — Tbilisi GEO
1951 — Petrosian, Tigran A. vs Tolush, Alexander — 0-1 — Tbilisi GEO
1955 — Jezek, Jaroslav vs Kozma, Julius — 1/2-1/2 — Prague CZE
1958 — Spassky, Boris V. vs Krogius, Nikolai V — 1-0 — Riga ch-URS
9.dxc5 — 7.0% (39 parties)
1954 — Uhlmann, Wolfgang vs Minev, Nikolay N — 1/2-1/2 — Prague zt Prague CZE
1957 — Bykov, Vladimir vs Cherepkov, Alexander V — 1-0 — Leningrad RUS
1959 — Delmar, Gabriel vs Pithart, Frantisek — 0-1 — Trebic
1966 — Bouaziz, Nejib vs Ortega, Rogelio — 0-1 — Havana CUB
1978 — Lim, Seng Hoo vs Gutierrez Herrera, Jose Antonio — 1-0 — Kikinda Yugoslavia