D66b - 8…a6 - QGD: Orthodox, Main Line (1923)

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D66b — Orthodox Main Line (1923)
1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 a6
Les coups candidats
9.O-O — 40.9% (115 parties)
Ambassadeurs : Gligoric, Sofija (2x), Bobotsov, Milko G (2x), Proehl, Holger (2x), Amaro, Lucas Ibrair (1x), Bolbochan, Jacobo (1x), Guimard, Carlos E (1x), Peraza, Owen (1x), Ujtumen, Tudev (1x)
9.cxd5 — 21.0% (59 parties)
Ambassadeurs : Zoltek, Tadeusz (2x), Westermeier, Arnulf (2x), Brenninkmeijer, Joris (2x), Rabar, Braslav (1x), Bolbochan, Julio (1x), Casas Perea, Fernando (1x), Amaro, Lucas Ibrair (1x), Jenik, Gyula (1x)
9.c5 — 18.1% (51 parties)
Ambassadeurs : Izeta Txabarri, Felix (2x), Schulien, Charles (1x), ADEJIMI NICHOLAS ISAAC (1x), Goehring, Karl-Heinz (1x), Westermeier, Arnulf (1x), Ageichenko, Genadi A (1x), Arbakov, Valentin (1x), Rapaka Samuel Paul (1x)
9.a4 — 8.9% (25 parties)
Ambassadeurs : Kuligowski, Adam (2x), Byrne, Robert E (2x), Kveinys, Aloyzas (1x), Arbakov, Valentin (1x), Bakheet Farag (1x), Lengyel, Bela (1x), Horvath, Jozsef (1x), Izsak, Gyula (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 9.O-O 9.cxd5 9.c5 9.a4
<1800 9 44% 22% 22% 11%
1800-2200 103 50% 19% 13% 9%
2200-2600 108 29% 22% 26% 11%
2600+ 10 30% 20% 20% 10%
Évolution par décennie (% des parties)
Décennie N parties 9.O-O 9.cxd5 9.c5 9.a4
1950s 6 50% 50% — —
1960s 9 67% 11% — —
1970s 13 15% 23% 23% 15%
1980s 28 18% 43% 29% 7%
1990s 72 47% 15% 21% 4%
2000s 86 43% 14% 16% 12%
2010s 57 47% 25% 12% 11%
2020s 10 10% 30% 40% 20%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9.O-O 47% 10% ▼ -37.4%
9.cxd5 25% 30% ▲ +5.4%
9.c5 12% 40% ▲ +27.7%
9.a4 11% 20% ▲ +9.5%
Parties historiques
9.O-O — 40.9% (115 parties)
1952 — Amaro, Lucas Ibrair vs Bolbochan, Jacobo — 1/2-1/2 — Mar del Plata ARG
1953 — Kholmov, Ratmir D vs Panov, Vasily — 1-0 — Vilnius LTU
1959 — Zamkovskaya, Violetta Aleks vs Ousatchi, Mark — 0-1 — Kiev UKR
1962 — Gligoric, Sofija vs Guimard, Carlos E — 1/2-1/2 — Havana CUB
1967 — Peraza, Owen vs Ujtumen, Tudev — 0-1 — Havana CUB
9.cxd5 — 21.0% (59 parties)
1952 — Rabar, Braslav vs Bolbochan, Julio — 1/2-1/2 — Helsinki olm
1952 — Casas Perea, Fernando vs Amaro, Lucas Ibrair — 1/2-1/2 — Buenos Aires ARG
1955 — Shagalovich, Abo vs Goldenov, Boris P — 0-1 — Minsk BLR
1967 — Jenik, Gyula vs Banszky, Janos — 0-1 — Hungary CCC-8
1970 — Freise, Helmut vs Westermeier, Arnulf — 0-1 — Voelklingen
9.c5 — 18.1% (51 parties)
1975 — Rapaka Samuel Paul vs Lombardy, William J — 1/2-1/2 — Oberlin ch-USA
1976 — Amado, Claudio vs Faleg, Alberto — 1-0 — Buenos Aires ch-ARG
1979 — Lukacs, Peter vs Zoltek, Tadeusz — 1/2-1/2 — Lodz POL
1980 — Goehring, Karl-Heinz vs Westermeier, Arnulf — 1/2-1/2 — GER
1984 — Messenger, Robert vs Griego, David — 1-0 — Providence, RI USA
9.a4 — 8.9% (25 parties)
1978 — Kuligowski, Adam vs Byrne, Robert E — 1-0 — Buenos Aires ARG
1978 — Kuligowski, Adam vs Byrne, Robert E — 1-0 — Buenos Aires ARG
1987 — Bakheet Farag vs Lengyel, Bela — 1-0 — Budapest HUN
1989 — Kveinys, Aloyzas vs Arbakov, Valentin — 1/2-1/2 — Belgorod open
1992 — Straetling, Ronny vs Leonhardt, Herbert — 1-0 — GER