C92b - 9…a5 - Closed, Keres Variation (1935)

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C92b — Closed, Keres Variation (1935)
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.h3 a5
Les coups candidats
10.d4 — 50.3% (257 parties)
Ambassadeurs : Romanishin, Oleg M (10x), Zaitsev, Igor A (5x), Keres, Paul Petrovich (4x), Kvisla, Johannes Luangtep (4x), Semcesen, Daniel (4x), Aleksandrov, Viktor A. (4x), Estrin, Yakov (3x), Smyslov, Vasily (3x)
10.a4 — 31.1% (159 parties)
Ambassadeurs : Kotan, Ladislav (9x), Zaitsev, Igor A (5x), Blatny, Pavel (4x), Kupreichik, Viktor D (3x), Aleksandrov, Viktor A. (3x), Pietzsch, Wolfgang (2x), Isaksson, Sten (2x), Keres, Paul Petrovich (2x)
10.d3 — 14.9% (76 parties)
Ambassadeurs : Smagin, Sergey (3x), Payen, Arnaud (3x), Zaitsev, Igor A (3x), Fischer, Robert J (2x), Sherwin, James T (2x), Kupreichik, Viktor D (2x), Wolff, Patrick G (2x), Shchekachev, Andrei (2x)
10.a3 — 3.1% (16 parties)
Ambassadeurs : Hansen, Lars Bo (2x), Justin, Matjaz (1x), Lazovic, Gordan (1x), Kwiatkowski, Feliks J (1x), Lane, Gary W (1x), ? (1x), Tyni, Jukka-Pekka (1x), Giaccio, Alfredo (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 10.d4 10.a4 10.d3 10.a3
<1800 13 54% 46% — —
1800-2200 88 51% 34% 11% 2%
2200-2600 323 48% 31% 16% 4%
2600+ 14 79% 14% 7% —
Évolution par décennie (% des parties)
Décennie N parties 10.d4 10.a4 10.d3 10.a3
1950s 32 41% 34% 25% —
1960s 21 57% 29% 14% —
1970s 7 86% 14% — —
1980s 24 38% 33% 29% —
1990s 81 41% 33% 20% 5%
2000s 127 44% 31% 21% 3%
2010s 159 57% 30% 8% 4%
2020s 60 62% 32% 5% 2%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
10.d4 57% 62% ▲ +4.4%
10.a4 30% 32% ▲ +1.5%
10.d3 8% 5% ▼ -2.5%
10.a3 4% 2% ▼ -2.7%
Joueurs célèbres
Champions du monde dans cette position
Carlsen, Magnus — 1 partie
Parties historiques
10.d4 — 50.3% (257 parties)
1952 — Kotov, Alexander vs Estrin, Yakov — 1/2-1/2 — Moscow RUS
1952 — Oddy, W. vs Fuller, Jack — 0-1 — England
1955 — Abanin, Vladimir vs Keres, Paul — 1/2-1/2 — Moskou ch-URS
1955 — Ravinsky, Grigory vs Estrin, Yakov — 1-0 — Moscow RUS
1955 — Unzicker, Ferdinand, Dr. vs Keres, Paul Petrovich — 0-1 — Goteborg SWE
10.a4 — 31.1% (159 parties)
1950 — Castillo Bermudez, Manuel vs Bolbochan, Jacobo — 1/2-1/2 — Mar del Plata ARG
1950 — Bunyola Oliver, Pedro Antonio vs Barden, Leonard — 1-0 — West London CC
1951 — Gilg, Karl vs Stein, Georg — 1-0 — Duesseldorf GER
1954 — Livshin, Iosif vs Bannik, Anatolij — 1/2-1/2 — Kiev ch-URS
1955 — Puc, Stojan vs Witkowski, Stefan — 1-0 — Ljubljana
10.d3 — 14.9% (76 parties)
1954 — Vasiukov, Evgeni vs Suetin, Alexey S — 1-0 — Riga LAT
1955 — Djurasevic, Bozidar vs Talevski, Mihajlo — 1/2-1/2 — Novi Sad SRB
1956 — Borsony, Valt vs Kaliwoda, Kurt — 1-0 — ICCF
1956 — Siaperas, Triantafyllos vs Benkner, Otto — 1/2-1/2 — Moskou olm
1958 — Van Perlo, Gerardus C vs Perfors, Barthold — 0-1 — NLD-KNSB
10.a3 — 3.1% (16 parties)
1990 — ? vs Tyni, Jukka-Pekka — 1/2-1/2 — FIN-ch Helsinki FIN
1994 — Kwiatkowski, Feliks J vs Lane, Gary W — 0-1 — Londen open
1998 — Justin, Matjaz vs Lazovic, Gordan — 1/2-1/2 — Sk.Loka SLO/chTz1
1998 — Giaccio, Alfredo vs Slipak, Sergio — 1/2-1/2 — Villa Gisell
2000 — De Firmian, Nick vs Hansen, Lars Bo — 1/2-1/2 — Esbjerg DEN