C88j - 8.a4 - Closed, Anti-Marshall (1930)

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C88j — Ruy Lopez: Closed, Anti-Marshall (1930)
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.a4
Les coups candidats
Ambassadeurs : Hebden, Mark L (59x), Kupreichik, Viktor D (34x), Matulovic, Milan (29x), Blatny, Pavel (26x), Adams, Michael (26x), Kholmov, Ratmir D (22x), Geller, Efim P. (21x), Jansa, Vlastimil (17x)
Ambassadeurs : Beckett, Phillip J (23x), Kireev, Sergey (20x), Adams, Michael (19x), Ilyasov, Anatoly Fedorovich (19x), Grischuk, Alexander (19x), Osipov, Anatoly (17x), Aronian, Levon (16x), Schmidt, Theo (16x)
8…Rb8 — 5.6% (640 parties)
Ambassadeurs : Carlsen, Magnus (8x), Kennaugh, Charles W (6x), Sanz Alonso, Francisco Javier (5x), Esipenko, Andrey (5x), Leisebein, Peter (4x), De La Paz Perdomo, Frank (4x), Shuvalova, Polina (4x), Duda, Jacob (4x)
8…d5 — 0.9% (98 parties)
Ambassadeurs : Brenjo, Slavisa (2x), Chassard, Cedric (2x), Habel, K. (1x), Konietzka, G. (1x), Ivarsson, Johnny (1x), Barmbold, Hans Ulrich (1x), Gesos, Pavlos (1x), Perecz, Laszlo (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 8…Bb7 8…b4 8…Rb8 8…d5
<1800 522 51% 43% 4% 1%
1800-2200 4004 48% 45% 5% 1%
2200-2600 4718 47% 45% 6% 1%
2600+ 573 31% 62% 6% 0%
Évolution par décennie (% des parties)
Décennie N parties 8…Bb7 8…b4 8…Rb8 8…d5
1950s 47 49% 21% 28% —
1960s 278 57% 34% 8% 1%
1970s 261 73% 20% 6% 1%
1980s 670 82% 15% 3% 0%
1990s 1455 70% 21% 8% 0%
2000s 2663 57% 36% 5% 0%
2010s 3380 32% 64% 3% 0%
2020s 2596 38% 50% 7% 3%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
8…Bb7 32% 38% ▲ +6.5%
8…b4 64% 50% ▼ -13.7%
8…Rb8 3% 7% ▲ +4.0%
8…d5 0% 3% ▲ +2.8%
Joueurs célèbres
Champions du monde dans cette position
Tal, Mikhail — 10 parties
Karpov, Anatoly — 10 parties
Anand, Viswanathan — 10 parties
Carlsen, Magnus — 10 parties
Ding, Liren — 10 parties
Kasparov, Garry — 9 parties
Hou, Yifan — 4 parties
Kramnik, Vladimir — 1 partie
Gukesh D — 1 partie
Ju, Wenjun — 1 partie
Parties historiques
8…Bb7 — 48.7% (5527 parties)
1951 — Bolbochan, Jacobo vs Maderna, Carlos — 0-1 — Mar del Plata ARG
1951 — Eastman, Gavey vs Isaacs, Lewis Jl — 1-0 — Forth Worth
1951 — Shcherbakov, Vadim vs Korchnoi, Viktor — 0-1 — Minsk BLR
1951 — Gecsei, Istvan vs Pogats, Jozsef Jr. — 1-0 — Hungary ch
1952 — Gilg, Karl vs Thiermann, Otto — 1-0 — Passau By-ch
8…b4 — 43.8% (4976 parties)
1951 — Steiner, Lajos vs Karoly, George — 1-0 — Brisbane AUS
1952 — Vasconcellos, Fernando O vs Santiago Oliveira, Ernani — 0-1 — Sao Paulo BRA
1953 — Pilnik, Herman vs Shocron, Ruben — 1/2-1/2 — Mar del Plata ARG
1955 — Keres, Paul Petrovich vs Smyslov, Vasily — 0-1 — Moskva ch-SU
1957 — CHUKS, Smith Daniel vs Haines, William C — 1/2-1/2 — ?
8…Rb8 — 5.6% (640 parties)
1951 — Bolbochan, Jacobo vs Vasconcellos, Fernando O — 1-0 — Mar del Plata ARG
1952 — Skold, Kristian vs Vasconcellos, Fernando O — 1-0 — Helsinki olm
1954 — Capps, C. vs Gross, Henry — 1/2-1/2 — San Francisco, CA USA
1955 — Benko, Pal vs Bak, Istvan — 1/2-1/2 — Hungary ch
1957 — Sanguineti, Raúl Carlos vs Cruz Ccori Wenner — 1-0 — Rio de Janeiro BRA
8…d5 — 0.9% (98 parties)
1968 — Habel, K. vs Konietzka, G. — 1-0 — corr FRG-PK
1969 — Ivarsson, Johnny vs Barmbold, Hans Ulrich — 1/2-1/2 — It Bad Pyrmont GER
1972 — Kurc, Ferenc vs Bjelosevic, Milutin — 1-0 — cr.
1974 — Ashid, Tsetseg-Ulzii vs Martinov, Alessandro — 1-0 — ?
1975 — Gesos, Pavlos vs Perecz, Laszlo — 1-0 — HUN