D28g - 9.exd4 - QGA: Classical (1945)

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D28g — 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.Bd3 cxd4 9.exd4
Les coups candidats
9…Be7 — 60.7% (221 parties)
Ambassadeurs : Neverov, Valeriy (7x), Rublevsky, Sergei (6x), Golz, Werner (4x), Borisenko, Georgy K (3x), Portisch, Lajos (3x), Laghetti, Gaetano (3x), Korchnoi, Viktor (2x), Ulybin, Mikhail (2x)
9…Bb7 — 24.2% (88 parties)
Ambassadeurs : Keres, Paul (4x), Turner, Abe J (3x), Rashkovsky, Nukhim N (3x), Szily, Jozsef (2x), Baumgartner, Walter (2x), Del Gobbo, Michel (2x), ? (2x), Byrne, Robert E (1x)
9…Nc6 — 14.6% (53 parties)
Ambassadeurs : Kupreichik, Viktor D (3x), Garcia Palermo, Carlos Horacio (2x), Rashkovsky, Nukhim N (2x), Bekker-Jensen, David (2x), Geller, Efim P. (1x), Alatortsev, Vladimir N. (1x), Vistaneckis, Isakas (1x), Maltsev, Leonid (1x)
9…Nbd7 — 0.5% (2 parties)
Ambassadeurs : Menas, Borel (1x), Dahl, Peter (1x), Marinelli, Tullio (1x), Lantini, Marco (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 9…Be7 9…Bb7 9…Nc6 9…Nbd7
<1800 11 45% 36% 18% —
1800-2200 80 61% 28% 11% —
2200-2600 199 63% 20% 16% 1%
2600+ 7 86% — 14% —
Évolution par décennie (% des parties)
Décennie N parties 9…Be7 9…Bb7 9…Nc6 9…Nbd7
1950s 13 15% 62% 23% —
1960s 18 78% 17% 6% —
1970s 5 40% 20% 20% 20%
1980s 45 47% 38% 16% —
1990s 81 62% 16% 21% 1%
2000s 94 67% 16% 17% —
2010s 93 66% 28% 6% —
2020s 15 53% 33% 13% —
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9…Be7 66% 53% ▼ -12.3%
9…Bb7 28% 33% ▲ +5.4%
9…Nc6 6% 13% ▲ +6.9%
9…Nbd7 0% 0% +0.0%
Joueurs célèbres
Champions du monde dans cette position
Tal, Mikhail — 2 parties
Parties historiques
9…Be7 — 60.7% (221 parties)
1956 — Bertholdt, Dieter vs Golz, Werner — 1-0 — Leipzig ch GDR
1959 — Kjellander, Sven Erik Gunnar vs Endzelins, Lucius — 1/2-1/2 — ?
1960 — Grechkin, Dmitry M vs Borisenko, Georgy K — 1/2-1/2 — USSR ch-05 6063
1960 — Bisguier, Arthur B vs Golz, Werner — 1-0 — Leipzig GER
1961 — Korchnoi, Viktor vs Borisenko, Georgy K — 1-0 — Moskou
9…Bb7 — 24.2% (88 parties)
1952 — Anay Barche vs Keres, Paul — 0-1 — Budapest HUN
1955 — Shocron, Ruben vs Dodero, Emilio — 1-0 — Buenos Aires ARG
1957 — Furman, Slavomir vs Keres, Paul — 0-1 — Moskou ch-URS
1957 — Abramovich Furman, Semyon vs Keres, Paul — 0-1 — Moscow RUS
1957 — Furman, Semyon vs Keres, Paul — 0-1 — Moscow RUS
9…Nc6 — 14.6% (53 parties)
1950 — Geller, Efim P. vs Alatortsev, Vladimir N. — 1/2-1/2 — Moskou ch-URS
1952 — Bozic, Aleksandar vs Vukovic, Sava — 1/2-1/2 — Belgrade SRB
1958 — Szabo, Laszlo vs Pilnik, Herman — 1-0 — Munich GER
1961 — Vistaneckis, Isakas vs Maltsev, Leonid — 1/2-1/2 — Palanga
1978 — Hanko, Pavel vs Schrancz, Istvan — 0-1 — Prievidza SVK
9…Nbd7 — 0.5% (2 parties)
1970 — Menas, Borel vs Dahl, Peter — 0-1 — No. California
1990 — Marinelli, Tullio vs Lantini, Marco — 1-0 — San Benedetto