A79c - 12.a4 - Classical, Main Line (1966)

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A79c — Classical, Main Line (1966)
1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2 Na6 11.f3 Nc7 12.a4
Les coups candidats
Ambassadeurs : Janosevic, Dragoljub (10x), Matulovic, Milan (9x), Gligoric, Sofija (6x), Vranesic, Zvonko (5x), Stein, Bernd (5x), Donner, Jan-Hein (5x), Wahls, Matthias (5x), Rogulj, Branko (5x)
Ambassadeurs : Zoll, Detlef (5x), ? (4x), Kraidman, Yair (3x), Kryukov, Vladimir (3x), Hesselbarth, Karlheinz, Dr. (3x), Donner, Jan-Hein (2x), Witkowski, Stefan (2x), Adamski, Jan (2x)
12…Nh5 — 1.7% (19 parties)
Ambassadeurs : Ribeiro, Ubirajara (1x), Leone, Neville Correa A (1x), Kagan, Shimon (1x), Carvajal Montoya, Juan Camilo (1x), James, David J (1x), Holt, Eric J (1x), Holm, Sejer (1x), De Castro, Edgar (1x)
12…a6 — 1.4% (15 parties)
Ambassadeurs : Fernandez Fornes, Juan Alberto (1x), Cunha, Carneiro Paulo Roberto (1x), Mandato (1x), Actis, Pablo (1x), Behrhorst, Frank (1x), Koepsell Rudolf (1x), Schulte Eversum Hendrik (1x), Krawczyk, Adalbert (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 12…b6 12…Nd7 12…Nh5 12…a6
<1800 25 60% 28% 8% 4%
1800-2200 275 68% 24% 1% 3%
2200-2600 513 77% 20% 2% 0%
2600+ 11 45% 55% — —
Évolution par décennie (% des parties)
Décennie N parties 12…b6 12…Nd7 12…Nh5 12…a6
1950s 4 75% 25% — —
1960s 75 67% 29% 3% —
1970s 173 66% 30% 2% 2%
1980s 204 84% 14% — —
1990s 144 80% 12% 3% 2%
2000s 226 62% 31% 3% 3%
2010s 166 60% 35% 1% 1%
2020s 115 88% 7% 1% 2%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
12…b6 60% 88% ▲ +28.2%
12…Nd7 35% 7% ▼ -28.0%
12…Nh5 1% 1% -0.3%
12…a6 1% 2% ▲ +1.1%
Joueurs célèbres
Champions du monde dans cette position
Tal, Mikhail — 3 parties
Kramnik, Vladimir — 2 parties
Carlsen, Magnus — 1 partie
Hou, Yifan — 1 partie
Parties historiques
12…b6 — 71.7% (794 parties)
1955 — Birbrager, Isaak vs Tal, Mikhail — 1/2-1/2 — Voroshilovgrad
1959 — Niphauz vs Bialas, Adrian — 0-1 — BRD ch
1959 — Niephaus, Walter vs Bialas, Wolfram — 0-1 — FRG-ch Nuerenberg GER
1961 — Petrosian, Tigran V. vs Shmidt, Aleksandr — 1-0 — Zurich SUI
1961 — Novotelnov, Nikolai vs Blechzin, Igor — 0-1 — Leningrad RUS
12…Nd7 — 23.1% (256 parties)
1959 — Furman, Semyon vs Tal, Mikhail — 1/2-1/2 — Tbilisi ch-URS
1960 — Kryukov, Vladimir vs Koblents Aleksandrs N — 1-0 — ?
1960 — Veltmander, Vitaliy vs Koblents — 0-1 — corr ch-SU
1962 — Uhlmann, Wolfgang vs Portisch, Lajos — 0-1 — Budapest HUN
1964 — Donner, Jan-Hein vs Hein-Letelier Martner, Rene — 1-0 — Havana Cap-mem
12…Nh5 — 1.7% (19 parties)
1966 — Kagan, Shimon vs Carvajal Montoya, Juan Camilo — 1-0 — Havana CUB
1967 — Ribeiro, Ubirajara vs Leone, Neville Correa A — 1/2-1/2 — ?
1970 — James, David J vs Holt, Eric J — 1-0 — Glasgow, Bearsden
1970 — Holm, Sejer vs De Castro, Edgar — 1-0 — Siegen olm
1970 — Balemans, A. vs Holt, Eric — 0-1 — Bearsden, Glasgow
12…a6 — 1.4% (15 parties)
1971 — Mandato vs Actis, Pablo — 0-1 — Bari ITA
1975 — Behrhorst, Frank vs Koepsell Rudolf — 1/2-1/2 — Hamburg GER
1977 — Fernandez Fornes, Juan Alberto vs Cunha, Carneiro Paulo Roberto — 1-0 — ?
1990 — Manninen, Anssi vs Kytoniemi, Jyrki — 1/2-1/2 — Kemi We KemTS
1996 — Schulte Eversum Hendrik vs Krawczyk, Adalbert — 0-1 — GER