D14f - 8.Qb3 - Exchange (1945)

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D14f — Exchange (1945)
1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5 5.Nc3 Nc6 6.Bf4 Bf5 7.e3 e6 8.Qb3
Les coups candidats
Ambassadeurs : Nenciulescu, Silviu (18x), Hector, Jonny (17x), Meduna, Eduard (9x), Sammalvuo, Tapani (6x), Grigore, George-Gabriel (6x), Krallmann, Matthias (5x), Luyks, Marinus (5x), Kreutzkamp, Reinhold (5x)
8…Qb6 — 12.0% (182 parties)
Ambassadeurs : Balogh, Tomas (3x), Cvitan, Ena (2x), Cobo Arteaga, Eldis (1x), Pomar Salamanca, Arturo (1x), Dworzynski, Roman (1x), Litmanowicz, Wladyslaw (1x), Nagy, Zoltan (1x), Octaviano, Patrick Matheus (1x)
8…Qd7 — 1.1% (16 parties)
Ambassadeurs : Eschenbrenner, Werner (1x), Heck, Stefan (1x), Lyles, M (1x), Goins, David A (1x), Quidiello Prado, Manuel Rogelio (1x), Gonzalez Munoz, Jose Miguel (1x), Sanchez Jimenez, Juan Carlos (1x), Valero De Dios, Juan Jose (1x)
8…Qc8 — 0.7% (10 parties)
Ambassadeurs : Rejfir, Josef (1x), Bely, Miklos (1x), Meduna, Eduard (1x), Velicka, Petr (1x), Pluemmer, Rolf (1x), Holzhey, Beate (1x), Milchev, Nikolay (1x), Maleki, Nicolas (1x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 8…Bb4 8…Qb6 8…Qd7 8…Qc8
<1800 53 64% 23% 9% 2%
1800-2200 462 84% 12% 2% 0%
2200-2600 807 88% 11% 0% 1%
2600+ 87 94% 6% — —
Évolution par décennie (% des parties)
Décennie N parties 8…Bb4 8…Qb6 8…Qd7 8…Qc8
1950s 18 89% 11% — —
1960s 18 83% 11% — 6%
1970s 12 92% 8% — —
1980s 39 82% 13% — —
1990s 194 78% 19% 2% —
2000s 368 81% 14% 1% 1%
2010s 626 89% 9% 0% 1%
2020s 247 85% 12% 2% 0%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
8…Bb4 89% 85% ▼ -4.0%
8…Qb6 9% 12% ▲ +3.1%
8…Qd7 0% 2% ▲ +1.9%
8…Qc8 1% 0% -0.2%
Joueurs célèbres
Champions du monde dans cette position
Kramnik, Vladimir — 2 parties
Anand, Viswanathan — 1 partie
Gukesh D — 1 partie
Carlsen, Magnus — 1 partie
Ju, Wenjun — 1 partie
Parties historiques
8…Bb4 — 85.2% (1296 parties)
1950 — Chestnov, Vitaliy A. vs Furman, Semyon — 0-1 — Dzintari
1951 — Letelier Martner, Rene vs Jauregui, Carlos — 1-0 — Santiago de Chile
1952 — Litmanowicz, Wladyslaw vs Grynfeld, Izaak — 1/2-1/2 — Miedzyzdroje
1953 — Rabar, Braslav vs Trifunovic, Petar — 1/2-1/2 — Zagreb CRO
1953 — Petrosian, Tigran V. vs Smyslov, Vasily — 1/2-1/2 — Zurich SUI
8…Qb6 — 12.0% (182 parties)
1955 — Dworzynski, Roman vs Litmanowicz, Wladyslaw — 1/2-1/2 — Poland ch13
1959 — Letelier Martner, Rene vs Rebaza — 0-1 — Lima PER
1960 — Nagy, Zoltan vs Octaviano, Patrick Matheus — 1/2-1/2 — Bucharest ROU
1969 — Cobo Arteaga, Eldis vs Pomar Salamanca, Arturo — 1/2-1/2 — Havana CUB
1976 — Boensch, Uwe vs Spiridonov, Nikola — 1/2-1/2 — Halle GER
8…Qd7 — 1.1% (16 parties)
1992 — Quidiello Prado, Manuel Rogelio vs Gonzalez Munoz, Jose Miguel — 1-0 — ?
1995 — Eschenbrenner, Werner vs Heck, Stefan — 1-0 — GER
1999 — Lyles, M vs Goins, David A — 1-0 — San Mateo, CA USA
2001 — Sanchez Jimenez, Juan Carlos vs Valero De Dios, Juan Jose — 1-0 — Mancha Real
2008 — Terrieux, Kevin vs Poignonnec, Pierre-Yves — 1-0 — Fouesnant FRA
8…Qc8 — 0.7% (10 parties)
1960 — Rejfir, Josef vs Bely, Miklos — 1-0 — Marianske Lazne
2000 — Meduna, Eduard vs Velicka, Petr — 1/2-1/2 — Opava CZE
2007 — Pluemmer, Rolf vs Holzhey, Beate — 1-0 — ?
2007 — Grigore, George-Gabriel vs Cuijpers, Frans Andre — 1-0 — Sitges ESP
2009 — Milchev, Nikolay vs Maleki, Nicolas — 0-1 — Rochefort