C92g - 11.a4 - Closed, Karpov Variation (1945)

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C92g — Closed, Karpov Variation (1945)
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d6 9.h3 Nd7 10.d4 Bf6 11.a4
Les coups candidats
11…Bb7 — 73.9% (771 parties)
Ambassadeurs : Sagfjara, Magne (14x), Barkhagen, Jonas (13x), Asturiano Molina, Javier (12x), Jabot, Daniel (11x), Stobbe, Arthur J (10x), Villani, Cristian (10x), Miguel, Tomas (10x), Blanaru, Ciprian-Georgian (10x)
11…Rb8 — 12.8% (134 parties)
Ambassadeurs : Bolduc, Steve (7x), Milos, Gilberto (4x), Asturiano Molina, Javier (4x), Zochowski, Kacper (4x), Unzicker, Ferdinand, Dr. (3x), Eti, L.. (3x), Kopriva, Oldrich (3x), Agdestein, Simen (3x)
11…Na5 — 11.4% (119 parties)
Ambassadeurs : Nikolichev, Aleksandr A (10x), Kirchshofer, Ernst (9x), Tal, Mikhail (7x), Grillon, Jean Marie (7x), Goedhart, William (7x), Stein, Leonid (5x), Geller, Efim P. (5x), Sarosy, Zoltan L (4x)
11…bxa4 — 0.7% (7 parties)
Ambassadeurs : Jabot, Daniel (2x), Ravinsky, Grigory (1x), Ragozin, Viacheslav (1x), Shapiro, Michael (1x), Klompus Grigory (1x), Bellin, Robert (1x), Phillips, Alan (1x), Eti, L.. (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 11…Bb7 11…Rb8 11…Na5 11…bxa4
<1800 29 83% 7% 10% —
1800-2200 189 79% 16% 4% —
2200-2600 513 82% 12% 6% —
2600+ 62 74% 18% 8% —
Évolution par décennie (% des parties)
Décennie N parties 11…Bb7 11…Rb8 11…Na5 11…bxa4
1950s 28 50% 43% 4% 4%
1960s 46 37% 7% 54% —
1970s 31 32% 10% 55% 3%
1980s 53 49% 25% 25% 2%
1990s 419 76% 10% 11% 1%
2000s 285 86% 12% 2% —
2010s 153 79% 14% 6% —
2020s 29 66% 28% 7% —
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
11…Bb7 79% 66% ▼ -13.6%
11…Rb8 14% 28% ▲ +13.2%
11…Na5 6% 7% ▲ +1.0%
11…bxa4 0% 0% +0.0%
Joueurs célèbres
Champions du monde dans cette position
Tal, Mikhail — 10 parties
Karpov, Anatoly — 10 parties
Kasparov, Garry — 6 parties
Anand, Viswanathan — 2 parties
Hou, Yifan — 2 parties
Smyslov, Vladimir — 1 partie
Parties historiques
11…Bb7 — 73.9% (771 parties)
1950 — Boleslavsky, Isaac vs Smyslov, Vladimir — 1-0 — Moskou ch-URS
1951 — Unzicker, Ferdinand, Dr. vs Aditya Balu Jadhav — 1-0 — Freiberg
1952 — Van den Berg, Carel B vs Penrose, Jonathan — 1/2-1/2 — London ENG
1953 — Horn, Andreas vs Grzeskowiak, Felix — 1/2-1/2 — ?
1954 — Abiolla James vs Phillips Andrea — 0-1 — Nottingham ch-BCF
11…Rb8 — 12.8% (134 parties)
1953 — Rabar, Braslav vs Nikolac, Juraj — 1/2-1/2 — Zagreb CRO
1953 — Unzicker, Ferdinand, Dr. vs Nikolac, Juraj — 1/2-1/2 — Opatija
1954 — Burstein, S vs Unzicker, Ferdinand, Dr. — 0-1 — Munich GER
1954 — Burstein, Almog vs Unzicker, Ferdinand, Dr. — 0-1 — Munich GER
1954 — Byvshev, Vasily vs Sokolsky, Alexey — 1-0 — Kiev ch-URS
11…Na5 — 11.4% (119 parties)
1956 — Tal, Mikhail vs Kolarov, Atanas S. — 1-0 — WchT U26 Upsala
1964 — Tal, Mikhail vs Averbakh, Yuri L — 1-0 — Kiev ch-URS
1964 — Tal, Mikhail vs Geller, Efim P. — 1-0 — Moskva tt
1964 — Tal, Mikhail vs Geller, Efim P. — 1-0 — Moscow RUS
1965 — ? vs Milic, Borislav — 1/2-1/2 — Belgrade SRB
11…bxa4 — 0.7% (7 parties)
1955 — Ravinsky, Grigory vs Ragozin, Viacheslav — 1/2-1/2 — Moscow RUS
1973 — Bellin, Robert vs Phillips, Alan — 1-0 — Islington ENG
1980 — Shapiro, Michael vs Klompus Grigory — 0-1 — ?
1990 — Pienaar, Ane vs Adomaitis, Benas — 1-0 — corr Italy
1994 — Kobryn, Wieslaw vs Jabot, Daniel — 0-1 — ICCF