B11m - 7.a3 - Two Knights (1955)

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B11m — Two Knights (1955)
1.e4 c6 2.Nc3 d5 3.Nf3 Bg4 4.h3 Bxf3 5.Qxf3 e6 6.d3 Nf6 7.a3
Les coups candidats
7…Nbd7 — 52.6% (261 parties)
Ambassadeurs : Simagin, Vladimir (4x), Kagan, Shimon (3x), Blackstone, John (3x), Lutikov, Anatoly S (2x), Fischer, Robert J (2x), Delander, Adolf (2x), Unzicker, Ferdinand, Dr. (2x), Gundlach, Frank (2x)
7…Be7 — 20.4% (101 parties)
Ambassadeurs : Kolbak, Jens (2x), Suetin, Alexey S (2x), Heinig, Wolfram, Dr. (2x), Govbinder, Mikhail Yudovich (1x), Makogonov, Vladimir (1x), Persitz, Raaphi (1x), Guti, Emanuel (1x), Smyslov, Vasily (1x)
7…Bd6 — 7.9% (39 parties)
Ambassadeurs : Simovich, O. (1x), Morgulov, Alexsander M (1x), Ali Gatee (1x), Fuller, Maxwell L (1x), Sumiacher, Carlos (1x), Weber, Raymond (1x), Schmidt, Bodo (1x), Volkert, Klaus (1x)
7…d4 — 6.2% (31 parties)
Ambassadeurs : Lupulescu, Constantin (3x), Tazbir, Marcin (2x), Parligras, Mircea-Emilian (2x), Zakurdjaeva, Irina (2x), Mirzoeva, Elmira (2x), Gavrilescu, David (2x), Tompa, Janos (1x), Shashin, Boris (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 7…Nbd7 7…Be7 7…Bd6 7…d4
<1800 14 64% 29% — —
1800-2200 149 46% 21% 9% 7%
2200-2600 251 58% 16% 8% 7%
2600+ 10 60% — — —
Évolution par décennie (% des parties)
Décennie N parties 7…Nbd7 7…Be7 7…Bd6 7…d4
1950s 7 57% 14% — —
1960s 50 60% 24% 10% 2%
1970s 35 37% 40% 17% —
1980s 20 50% 20% 5% 5%
1990s 71 42% 31% 7% 6%
2000s 103 62% 17% 4% 4%
2010s 180 52% 13% 9% 11%
2020s 30 53% 20% 7% 7%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
7…Nbd7 52% 53% ▲ +1.1%
7…Be7 13% 20% ▲ +6.7%
7…Bd6 9% 7% ▼ -2.2%
7…d4 11% 7% ▼ -3.9%
Joueurs célèbres
Champions du monde dans cette position
Botvinnik, Mikhail — 1 partie
Tal, Mikhail — 1 partie
Parties historiques
7…Nbd7 — 52.6% (261 parties)
1955 — Simagin, Vladimir vs Zamkovskaya, Violetta Aleks — 1-0 — Voroshilovgrad
1959 — Trifunovic, Petar vs Matulovic, Milan — 1/2-1/2 — Kragujevac ch14-YUG
1959 — Mohrlok, Dieter vs Schuster, Theodor — 1/2-1/2 — Nuerenberg GER
1959 — Van Seters, Frits vs Bouwmeester, Hans — 0-1 — Deventer NLD-BEL
1960 — Blackstone, John vs Rogers, William P — 1-0 — Palo Alto, CA
7…Be7 — 20.4% (101 parties)
1958 — Smyslov, Vasily vs Botvinnik, Mikhail — 1-0 — Moskou wch-m
1961 — Persitz, Raaphi vs Guti, Emanuel — 1-0 — Netanya ISR
1961 — Suetin, Alexey S vs Kirillov, Valentins — 1-0 — Sochi RUS
1961 — Shianovsky, Vladislav I vs ? — 1/2-1/2 — Kiev UKR
1962 — Govbinder, Mikhail Yudovich vs Makogonov, Vladimir — 0-1 — Soviet Union
7…Bd6 — 7.9% (39 parties)
1961 — Blackstone, John vs Schmitt, James — 1/2-1/2 — San Francisco, CA USA
1963 — Simovich, O. vs Morgulov, Alexsander M — 1-0 — Soviet Union
1963 — Ali Gatee vs Fuller, Maxwell L — 0-1 — Vrnjacka Banja SRB
1968 — Schmidt, Bodo vs Volkert, Klaus — 1-0 — Saarbruecken
1969 — Sumiacher, Carlos vs Weber, Raymond — 1-0 — Wch jr prelim 4
7…d4 — 6.2% (31 parties)
1962 — Tompa, Janos vs Shashin, Boris — 1-0 — Leningrad-Budapest
1988 — Day, Lawrence A. vs Taylor, Gordon — 1/2-1/2 — Oakham House
1996 — Nastalek, A vs Peczak, Mariusz — 0-1 — Lodz POL
1998 — Hruby, Milan vs Richard, Philippe — 1/2-1/2 — IECG
1998 — Stockmann, Rainer vs Kapferer, Romed — 0-1 — Schwarzach opA