C90d - 9.a4 - Closed

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C90d — Closed
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.a4
Eval: [+0.24]
Les coups candidats
9…b4 — 32.4% (229 parties)
Ambassadeurs : Bernal Varela, Nelson (13x), Zapata, Alonso (5x), Ulybin, Mikhail (5x), Keres, Paul (4x), Giaccio, Alfredo (4x), Zielinski, Sergej (4x), Kmoch, Hans (3x), Ragozin, Viacheslav (3x)
Ambassadeurs : Bernal Varela, Nelson (11x), Ljubojevic, Ljubomir (5x), Jurkovic, Ante (4x), De Jong, Maarten (3x), Mertanen, Janne (3x), Zapata, Alonso (3x), Minev, Nikolay N (2x), Gligorić, Svetozar (2x)
9…Bb7 — 18.7% (132 parties)
Ambassadeurs : Podgaets, Mikhail (3x), Voyska, Margarita (2x), Filipenko, Alexander V (2x), Milovanovic, Rade (2x), Lakinska, Simona (2x), Klim, Kamil (2x), Groetzbach, Juergen (2x), Bellahcene, Bilel (2x)
9…Bd7 — 11.9% (84 parties)
Ambassadeurs : Beliavsky, Alexander G (4x), De Jong, Migchiel (4x), Ljubojevic, Ljubomir (3x), Giaccio, Alfredo (3x), Bernal Varela, Nelson (3x), Zapata, Alonso (3x), Short, Nigel D (3x), Hjartarson, Johann (2x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 9…b4 9…Bg4 9…Bb7 9…Bd7
<1800 15 40% 40% 13% 7%
1800-2200 167 29% 28% 25% 10%
2200-2600 358 29% 30% 18% 15%
2600+ 17 35% 35% — 29%
Évolution par décennie (% des parties)
Décennie N parties 9…b4 9…Bg4 9…Bb7 9…Bd7
1900s 1 — — — —
1910s 3 33% 33% — —
1920s 3 67% 33% — —
1930s 6 83% 17% — —
1940s 16 81% 6% — —
1950s 14 50% 29% 14% —
1960s 31 39% 26% 19% 10%
1970s 8 38% 25% 25% —
1980s 82 24% 40% 11% 17%
1990s 114 33% 28% 23% 9%
2000s 168 32% 30% 18% 12%
2010s 217 29% 30% 23% 12%
2020s 43 26% 21% 16% 26%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9…b4 29% 26% ▼ -3.9%
9…Bg4 30% 21% ▼ -9.5%
9…Bb7 23% 16% ▼ -6.3%
9…Bd7 12% 26% ▲ +13.6%
Joueurs célèbres
Champions du monde dans cette position
Smyslov, Vladimir — 2 parties
Anand, Viswanathan — 2 parties
Botvinnik, Mikhail — 1 partie
Alekhine, Alexander — 1 partie
Karpov, Anatoly — 1 partie
Karpov, Aleksandr — 1 partie
Parties historiques
9…b4 — 32.4% (229 parties)
1914 — Wainwright George Edward vs Lasker, Edward — 0-1 — London ENG
1927 — Romanovsky, Pjotr vs Rabinovich, Ilya Mar — 0-1 — Moskou ch-URS
1929 — Alekhine, Alexander vs Anderson Anderson, Jose Guillermo — 1-0 — Milwaukee, WI USA
1939 — Ragozin, Viacheslav vs Keres, Paul — 1-0 — Leningrad RUS
1939 — Kramer, Haije vs Kmoch, Hans — 1/2-1/2 — Leeuwarden NED
9…Bg4 — 29.5% (208 parties)
1912 — Yates, Frederic D vs Balla, Zoltan Tibor — 1/2-1/2 — Bad Pistyan CZE
1925 — De La Torre Huertas, Carlos vs Mieses, Jacques — 1-0 — Baden-Baden GER
1932 — Ilyin Zhenevsky, Alexander vs Savitsky, Leonid — 1/2-1/2 — Leningrad RUS
1948 — Penrose, Oliver vs Rhodes, Herbert Gibson — 1-0 — London, Bishopsgate
1950 — Kupferstich, Moises vs Zapata Vinces, Mario — 1/2-1/2 — Dubrovnik CRO
9…Bb7 — 18.7% (132 parties)
1954 — Darga, Klaus vs Bialas, Wolfram — 1-0 — Berlin GER
1955 — Vesely, Jiri vs Ivanco, Imrich — 0-1 — Prague CZE
1960 — Nezhmetdinov, Rashid vs Yudovich, Mikhail Jr — 1/2-1/2 — Perm RUS
1963 — Pachman, Ludek vs Kozma, Julius — 1/2-1/2 — Prague CZE
1963 — Bergman Olsson, Eleonora vs Skold, Kristian — 1/2-1/2 — Karlskrona
9…Bd7 — 11.9% (84 parties)
1961 — Bertok, Mario Jr. vs Vospernik, Mira — 1-0 — Zagreb CRO
1963 — ? vs Kots, Yuri I — 1/2-1/2 — Kiev UKR
1968 — Formanek, Eduard vs Pollak, Andras — 1-0 — Ybbs
1985 — Mestel, A Jonathan vs Beliavsky, Alexander G — 0-1 — Lucerne SUI
1987 — Belik, Dalibor vs Spesny, Jan — 0-1 — Karvina