C90d - 9.a4 - Closed (1906)

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C90d — Closed (1906)
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
Les coups candidats
9…b4 — 31.0% (212 parties)
Ambassadeurs : Bernal Varela, Nelson (12x), Zapata, Alonso (5x), Ulybin, Mikhail (5x), Giaccio, Alfredo (4x), Zielinski, Sergej (4x), Bertok, Mario Jr. (3x), Klovans, Janis (3x), Fier, Alexandr (3x)
Ambassadeurs : Bernal Varela, Nelson (11x), Ljubojevic, Ljubomir (4x), Jurkovic, Ante (4x), Minev, Nikolay N (3x), Smejkal, Jan (3x), De Jong, Wim (3x), Mertanen, Janne (3x), Gligoric, Sofija (2x)
9…Bb7 — 19.7% (135 parties)
Ambassadeurs : Podgaets, Mikhail (3x), Voyska, Margarita (2x), Filipenko, Alexander V (2x), Belic, Milovan (2x), Klim, Kamil (2x), Bellahcene, Bilel (2x), Pachman, Ludek (1x), Kozma, Julius (1x)
9…Bd7 — 12.4% (85 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), Wu, Xibin (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 23 26% 43% 26% 4%
1800-2200 200 28% 27% 26% 10%
2200-2600 351 31% 29% 17% 14%
2600+ 16 44% 25% — 31%
Évolution par décennie (% des parties)
Décennie N parties 9…b4 9…Bg4 9…Bb7 9…Bd7
1950s 14 50% 29% 14% —
1960s 31 39% 26% 19% 10%
1970s 9 44% 22% 22% —
1980s 81 25% 40% 11% 17%
1990s 113 34% 27% 23% 9%
2000s 168 32% 30% 18% 12%
2010s 218 30% 30% 22% 12%
2020s 50 26% 18% 20% 24%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9…b4 30% 26% ▼ -3.8%
9…Bg4 30% 18% ▼ -12.3%
9…Bb7 22% 20% ▼ -2.5%
9…Bd7 12% 24% ▲ +12.1%
Joueurs célèbres
Champions du monde dans cette position
Anand, Viswanathan — 2 parties
Karpov, Anatoly — 1 partie
Parties historiques
9…b4 — 31.0% (212 parties)
1955 — Vesely, Jiri vs Ujtelky, Maximilián Samuel Rudolf — 0-1 — Prague CZE
1955 — Keres, Paul vs Smyslov, Vasily — 0-1 — Moskou ch-URS
1955 — Vesely, Jiri vs Dolezal, Jiri — 1-0 — Prague CZE
1956 — Rudenko, Ludmila vs Bykova, Elizaveta — 0-1 — Moscow RUS
1957 — Alexander Tadala vs Zhukhovitsky, Samuel — 1/2-1/2 — Leningrad RUS
9…Bg4 — 29.5% (202 parties)
1950 — Kupferstich, Moises vs Zapata Vinces, Mario — 1/2-1/2 — Dubrovnik CRO
1950 — Kupferstich, Moises vs Zapata Vinces, Mario — 1/2-1/2 — Dubrovnik olm
1955 — Keres, Paul Petrovich vs Ragozin, Viacheslav — 1-0 — Parnu Parnu EST
1959 — Bely, Miklos vs Siveri, Armando — 1-0 — Reggio Emilia ITA
1960 — Larusson, Gudmundur vs Buskenstrom, Sven — 0-1 — Leipzig GER
9…Bb7 — 19.7% (135 parties)
1954 — Darga, Klaus vs Bialas, Wolfram — 1-0 — Berlin GER
1955 — Vesely, Jiri vs Ivan, 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 — Olsson, Ake vs Skold, Kristian — 1/2-1/2 — Sweden
9…Bd7 — 12.4% (85 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, Edward vs Pollak, Georg — 1-0 — Ybbs
1985 — Mestel, A Jonathan vs Beliavsky, Alexander G — 0-1 — Lucerne SUI
1987 — Wu, Xibin vs Lin, Ta — 1-0 — ?