D29c - 9.a4 - QGA: Classical (1945)

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D29c — QGA: Classical (1945)
1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 b5 8.Bb3 Bb7 9.a4
Les coups candidats
Ambassadeurs : Uhlmann, Wolfgang (7x), Golz, Werner (5x), Bachmann, Karlheinz (4x), Fuchs, Reinhart (3x), Clarke, Peter (3x), Jussupow, Artur (3x), Bialas, Wolfram (3x), Raetsky, Alexander (3x)
Ambassadeurs : Chatalbashev, Boris (5x), Kallai, Gabor (4x), Drozd, Ryszard (2x), Weinstein, Raymond (2x), Turner, Abe J (2x), Lanc, Alois (2x), Sadler, Matthew D (2x), Jussupow, Artur (2x)
9…c4 — 6.9% (36 parties)
Ambassadeurs : Pilnik, Herman (1x), Stoltz, Gösta (1x), Jimenez Zerquera, Eleazar (1x), Vergara Zuleta, Alejandro (1x), Suetin, Alexey S (1x), Lehtivaara, Risto (1x), Jussupow, Artur (1x), Salov, Valery (1x)
9…Qb6 — 5.9% (31 parties)
Ambassadeurs : Rysbayeva, Aigerim (2x), Ghitescu, Theodor (1x), Georgescu, Vasile-Maxim (1x), Weinstein, Raymond (1x), Kovacs, Laszlo (1x), Rodriguez, Jorge Luis (1x), Slipak, Sergio (1x), Savitskaya, Ekaterina P. (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 9…Nbd7 9…b4 9…c4 9…Qb6
<1800 12 33% 33% 8% 25%
1800-2200 119 34% 40% 15% 9%
2200-2600 292 49% 41% 4% 5%
2600+ 13 69% 23% 8% —
Évolution par décennie (% des parties)
Décennie N parties 9…Nbd7 9…b4 9…c4 9…Qb6
1950s 23 78% 17% 4% —
1960s 35 80% 11% 3% 6%
1970s 7 71% 14% — —
1980s 22 82% 14% 5% —
1990s 194 51% 39% 4% 5%
2000s 156 40% 44% 6% 8%
2010s 70 34% 41% 16% 9%
2020s 18 22% 44% 28% 6%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9…Nbd7 34% 22% ▼ -12.1%
9…b4 41% 44% ▲ +3.0%
9…c4 16% 28% ▲ +12.1%
9…Qb6 9% 6% ▼ -3.0%
Joueurs célèbres
Champions du monde dans cette position
Anand, Viswanathan — 3 parties
Parties historiques
9…Nbd7 — 49.0% (257 parties)
1950 — Bondarevsky, Igor vs Alatortsev, Vladimir N. — 0-1 — Moscow RUS
1950 — Kotov, Alexander vs Flohr, Salo — 1-0 — Budapest HUN
1950 — Petrosian, Tigran V. vs Smyslov, Vasily — 1/2-1/2 — Moskou ch-URS
1951 — Kopilov, Nikolay Georgiyevich vs Flohr, Salo — 1/2-1/2 — Moscow RUS
1951 — Kapu, Jeno vs Borloy, Karoly — 1/2-1/2 — Hungary ch
9…b4 — 37.0% (194 parties)
1952 — Bozic, Aleksandar vs Abdi, Andreas — 0-1 — JUG-ch Belgrade YUG
1953 — Cafferty, Bernard vs Owen, HJ. — 1/2-1/2 — Kipping CC Wolverhampton
1954 — Fielding, Paul vs Amand, Harry — 0-1 — Hollywood
1957 — Fielding, Gerald vs Byrne, Robert E — 0-1 — Cleveland, OH USA
1960 — Golz, Werner vs Drozd, Ryszard — 1/2-1/2 — It Bad Salzungen GER
9…c4 — 6.9% (36 parties)
1952 — Pilnik, Herman vs Stoltz, Gösta — 1-0 — Belgrade SRB
1963 — Jimenez Zerquera, Eleazar vs Vergara Zuleta, Alejandro — 1-0 — Havana CUB
1989 — Suetin, Alexey S vs Lehtivaara, Risto — 1-0 — Espoo
1992 — Jussupow, Artur vs Salov, Valery — 1/2-1/2 — Parijs rapid
1993 — Solana Suarez, Ernesto vs Flear, Glenn C — 1/2-1/2 — Grand Canaria
9…Qb6 — 5.9% (31 parties)
1960 — Weinstein, Raymond vs Kovacs, Laszlo — 1-0 — Leningrad RUS
1967 — Ghitescu, Theodor vs Georgescu, Vasile-Maxim — 1/2-1/2 — ?
1992 — Rodriguez, Jorge Luis vs Slipak, Sergio — 1/2-1/2 — Buenos Aires ARG
1994 — Soppe, Guillermo vs Valiente, Cristobal — 1/2-1/2 — Montevideo URU
1995 — Schulte, Juergen vs Goetz, Andreas — 1/2-1/2 — Mittelfranken-ch