D29e - 9.a4 Nbd7 - QGA: Classical (1933)

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D29e — Classical
1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 b5 8.Bb3 Bb7 9.a4 Nbd7
Les coups candidats
10.axb5 — 52.3% (171 parties)
Ambassadeurs : Uhlmann, Wolfgang (7x), Golz, Werner (5x), Szymczak, Zbigniew (5x), Jussupow, Artur (4x), Sasikiran, Krishnan (4x), Krallmann, Matthias (4x), Kiriakov, Petr (3x), Meister, Jakob (3x)
Ambassadeurs : Vaulin, Alexander P. (2x), Ac, Michal (2x), Bialas, Wolfram (2x), Bachmann, Karlheinz (2x), Jaracz, Pawel (2x), Fine, Reuben (1x), Pilnik, Herman (1x), Euwe, Max (1x)
10.Nbd2 — 11.0% (36 parties)
Ambassadeurs : Hempson, Peter W (3x), Evans, Larry (1x), Rehberg, C (1x), Uneklint U (1x), Samuelsson Stefan (1x), Hodakowsky, Georg (1x), Rickers, Gerd (1x), Clarke, Peter H (1x)
10.e4 — 3.4% (11 parties)
Ambassadeurs : Guimard, Carlos E (2x), Najdorf, Miguel (2x), Flohr, Salo (2x), Stahlberg, Gideon (1x), Sanguinetti, Renato (1x), Pilnik Aranda, Karla Constanza (1x), Pilnik, Herman (1x), Kotov, Alexander (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 10.axb5 10.Rd1 10.Nbd2 10.e4
1800-2200 45 36% 36% 24% —
2200-2600 190 50% 35% 10% 1%
2600+ 12 83% 17% — —
Évolution par décennie (% des parties)
Décennie N parties 10.axb5 10.Rd1 10.Nbd2 10.e4
1930s 1 — 100% — —
1940s 8 25% 12% 12% 50%
1950s 19 53% 26% — 16%
1960s 28 50% 25% 18% 4%
1970s 5 100% — — —
1980s 18 67% 28% 6% —
1990s 104 72% 19% 3% 1%
2000s 79 49% 35% 9% 3%
2010s 54 20% 41% 33% —
2020s 11 27% 64% 9% —
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
10.axb5 20% 27% ▲ +6.9%
10.Rd1 41% 64% ▲ +22.9%
10.Nbd2 33% 9% ▼ -24.2%
10.e4 0% 0% +0.0%
Joueurs célèbres
Champions du monde dans cette position
Anand, Viswanathan — 2 parties
Euwe, Max — 1 partie
Alekhine, Alexander — 1 partie
Smyslov, Vladimir — 1 partie
Kramnik, Vladimir — 1 partie
Parties historiques
10.axb5 — 52.3% (171 parties)
1946 — Lundin, Erik vs Ekstrom, Folke — 1/2-1/2 — Stockholm SWE
1947 — Maderna, Carlos vs Stahlberg, Gideon — 0-1 — Mar del Plata ARG
1951 — Kopilov, Nikolay Georgiyevich vs Flohr, Salo — 1/2-1/2 — Moscow RUS
1951 — Suetin, Alexey S vs Alatortsev, Vladimir N. — 1-0 — Leningrad RUS
1952 — Florian, Tibor vs Pilnik, Herman — 1/2-1/2 — Helsinki FIN
10.Rd1 — 29.4% (96 parties)
1937 — Euwe, Max vs Alekhine, Alexander — 1-0 — Bad Nauheim
1945 — Fine, Reuben vs Pilnik, Herman — 1-0 — Washington, DC USA
1950 — Bondarevsky, Igor vs Alatortsev, Vladimir N. — 0-1 — Moskou ch-URS
1951 — Kapu, Jeno vs Borloy, Karoly — 1/2-1/2 — Hungary ch
1952 — Gruenfeld, Ernst vs O'Kelly, Albéric de Galway — 1/2-1/2 — Belgrade SRB
10.Nbd2 — 11.0% (36 parties)
1948 — Evans, Larry vs Rehberg, C — 1-0 — New York Marshall
1962 — Marsalek, Josef vs Fichtl, Jiri — 1/2-1/2 — Jablonec
1966 — Hodakowsky, Georg vs Rickers, Gerd — 1-0 — Heilbronn
1969 — Uneklint U vs Samuelsson Stefan — 0-1 — corr Sweden
1969 — Hempson, Peter W vs Clarke, Peter H — 0-1 — Rhyl WLS
10.e4 — 3.4% (11 parties)
1941 — Stahlberg, Gideon vs Najdorf, Miguel — 1-0 — Buenos Aires ARG
1941 — Guimard, Carlos E vs Pilnik, Herman — 1-0 — Buenos Aires ARG
1944 — Sanguinetti, Renato vs Pilnik Aranda, Karla Constanza — 1/2-1/2 — Buenos Aires ch-ARG
1946 — Guimard, Carlos E vs Najdorf, Miguel — 0-1 — Prague CZE
1950 — Kotov, Alexander vs Flohr, Salo — 1-0 — Tournament Budapest (HUN)