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A39d — Symmetrical Main Line
1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d4 cxd4 8.Nxd4 Qa5
Eval: [+0.37]
Les coups candidats
9.Nb3 — 46.2% (548 parties)
Ambassadeurs : Pantsulaia, Levan (6x), Banusz, Tamas (4x), Vakhidov, Jakhongir (4x), Xu, Minghui (4x), Fedder, Steen (3x), Marholev, Dimitar (3x), Matlakov, Maxim (3x), Almasi, Zoltan (3x)
9.e3 — 23.9% (284 parties)
Ambassadeurs : Bacrot, Etienne (7x), Indjic, Aleksandar (3x), Barseghyan, Armen Ar. (3x), Gurgenidze, Bukhuti (2x), Annageldyev, Orazly (2x), Andreikin, Dmitry (2x), Romanishin, Oleg M (2x), Meier, Georg (2x)
9.Nc2 — 22.1% (262 parties)
Ambassadeurs : Jansa, Vlastimil (3x), Gipslis, Aivars (2x), Giertz, Niklaus (2x), Keres, Paul (1x), Richard Pruun (1x), Kholmov, Ratmir D (1x), Avner, Uri (1x), Smiltiner, Shlomo (1x)
9.Nxc6 — 2.2% (26 parties)
Ambassadeurs : Kieser, Ernst (1x), Liang, Jinrong (1x), Nazarenus, Olaf (1x), Schluchter, Steffen (1x), Bento, Antonio (1x), Uchoa, Valdir (1x), Mas, Ioana (1x), Paasikangas, Johanna (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 9.Nb3 9.e3 9.Nc2 9.Nxc6
<1800 14 43% 21% 7% 14%
1800-2200 298 40% 23% 21% 4%
2200-2600 665 50% 23% 24% 1%
2600+ 97 46% 42% 9%
Évolution par décennie (% des parties)
Décennie N parties 9.Nb3 9.e3 9.Nc2 9.Nxc6
1930s 1 100%
1940s 1 100%
1950s 10 30% 20% 30%
1960s 24 25% 8% 54%
1970s 31 61% 3% 29%
1980s 38 58% 13% 18% 3%
1990s 108 42% 23% 22% 6%
2000s 111 39% 17% 30% 4%
2010s 674 50% 25% 19% 1%
2020s 189 37% 32% 23% 3%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
9.Nb3 50% 37% ▼ -13.9%
9.e3 25% 32% ▲ +7.2%
9.Nc2 19% 23% ▲ +3.6%
9.Nxc6 1% 3% ▲ +1.2%
Joueurs célèbres
Champions du monde dans cette position
Anand, Viswanathan — 2 parties
Ding, Liren — 2 parties
Smyslov, Vladimir — 1 partie
Tal, Mikhail — 1 partie
Ju, Wenjun — 1 partie
Parties historiques
9.Nb3 — 46.2% (548 parties)
1939 — Petrov, Vladimir (ENG) vs Czerniak, Moshe — 1-0 — Buenos Aires ARG
1956 — Buslaev, Aleksander vs Gurgenidze, Bukhuti — 1/2-1/2 — Georgia
1958 — Varnusz, Egon vs Bilek, Istvan — 1/2-1/2 — HUN-ch Budapest HUN
1959 — Forintos, Gyozo V vs Gipslis, Aivars — 1/2-1/2 — Budapest HUN
1960 — Lloyd, Kenneth vs Malich, Burkhard, Dr. — 0-1 — Leningrad RUS
9.e3 — 23.9% (284 parties)
1957 — Aaltio, Erkki vs Gurgenidze, Bukhuti — 0-1 — Reykjavik ISL
1958 — Zilber, Israel vs Gurgenidze, Bukhuti — 1-0 — Rostov on Don
1960 — Uusi, Gunnar vs Gipslis, Aivars — 1/2-1/2 — Vilnius LTU
1965 — Kolbak, Jens vs Jansa, Vlastimil — 1/2-1/2 — Sinaia
1977 — Kaspret, Guido vs Rivas Pastor, Manuel — 1/2-1/2 — Innsbruck AUT
9.Nc2 — 22.1% (262 parties)
1945 — Keres, Paul vs Richard Pruun — 1-0 — Tallinn (URS)
1950 — Bobekov, Radko vs Piskov, Kamen Penev — 1/2-1/2 — Sofia BUL
1954 — Fridstein, German vs Byvshev, Vasily — 1/2-1/2 — Riga LAT
1954 — Tarasov, Vitaly vs Gurgenidze, Bukhuti — 0-1 — Erevan ARM
1961 — Bagirov, Vladimir vs Gipslis, Aivars — 1/2-1/2 — Baku ch-URS
9.Nxc6 — 2.2% (26 parties)
1982 — Kieser, Ernst vs Liang, Jinrong — 0-1 — Lugano SUI
1990 — Sievilainen, Tuomo vs Lahti, Jouko — 1/2-1/2 — Kuopio Kalakukko
1992 — Mas, Ioana vs Paasikangas, Johanna — 0-1 — Wch U18 Girls
1995 — Mora Martinez, Luis vs Martinez Alcazar, Jesus — 0-1 — Burjasot
1996 — Nazarenus, Olaf vs Schluchter, Steffen — 1-0 — Pfalz-chB Landau