D29i — QGA: Classical, 8…Bb7 9.Rd1 Nbd7 10.a4 b4

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.Rd1 Nbd7 10.a4 b4 * ○ Trait aux Blancs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Plans. Nbd2 (Développer b1 — 67 % des parties) ; a5 (23 % des parties) ; e4 (Occuper le centre — 8 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

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Plans. ...Be7 (Développer f8 — 42 % des parties) ; ...Qc7 (Prépare O-O-O — 34 % des parties) ; ...cxd4 (Capture en d4, Occuper le centre — 23 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→e3, e3→d4	● c5→b4, f7→e6
Passés	—	—
Majorité	—	● aile dame 3v2

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● c4 (2v0), ● e5 (2v1)	● e4 (2v0), ● d5 (3v1)
Cases faibles	—	—
Centre	● d4 (3v1), ● e5 (2v1)	● d5 (3v1), ● e4 (2v0)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● c	● d

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 1)
Bb3	● Bb3 Actif (mob. 5)
Bb7		● Bb7 Actif (mob. 5)
Bf8		● Bf8 Non développé (mob. 2)
Paire de fous	● Oui	● Oui
Non développées	3 (● b1, ● c1, ● a1)	3 (● f8, ● a8, ● h8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Roqué	● Au centre
Droits de roque	—	O-O / O-O-O

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	mobile
Ruptures	● d4-d5	● …e6-e5

Partie
1928 Bad Kissingen – Round 7 – Bogoljubow, Efim – 1-0 – Rubinstein, Akiba – G39 1. d4 d5 2. Nf3 c5 3. c4 dxc4 4. e3 Nf6 5. Bxc4 e6 6. O-O a6 7. Qe2 b5 8. Bb3 Bb7 9. a4 b4 10. Rd1 Nbd7
1937 Semmering/Baden – Round 13 – Keres, Paul – 0-1 – Reshevsky, Samuel – G47 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. Rd1 Nbd7 10. a4 b4
1952 Buenos Aires – Round 9 – Incutto, Carlos – 0-1 – Bartis, Gustavo – G50 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. Rd1 Nbd7 10. a4 b4
1952 Liberation – Round 18 – Gruenfeld, Ernst – 1/2-1/2 – O'Kelly, Albéric de Galway – G50 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 10. Rd1 b4
1954 FRG Ch qual West – Round 3 – Von Gerkan, Hartwin – 1/2-1/2 – Werner, Stephan – G7 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O b5 7. Bb3 Bb7 8. Qe2 Nbd7 9. a4 b4 10. Rd1 c5
1962 Belgrade – Round 2 – Foguelman, Alberto – 0-1 – Maric Vild, Fabijan – G13 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. Rd1 Nbd7 10. a4 b4
1972 Skopje ol (Men) fin-A – Round 15 – Debarnot, Roberto – 1/2-1/2 – Padevsky, Nikola – G108 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. Rd1 Nbd7 10. a4 b4

D29i — QGA: Classical (1928)

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.Rd1 Nbd7 10.a4 b4

Les coups candidats

11.Nbd2 — 67.1% (114 parties)

Ambassadeurs : Spangenberg, Hugo (2x), Weglarz, Leszek (2x), Maly, Alexey (2x), Jonkman, Harmen (2x), Simacek, Pavel (2x), Von Gerkan, Hartwin (1x), Werner, Stephan (1x), Incutto, Carlos (1x)

11.a5 — 22.9% (39 parties)

Ambassadeurs : Meessen, Rudolf (2x), Moskowitz, Jack (1x), Amand, Harry (1x), Debarnot, Roberto (1x), Padevsky, Nikola (1x), Knuth, Hannes (1x), Nagendra, Rentala (1x), Miralles, Gilles (1x)

11.e4 — 8.2% (14 parties)

Ambassadeurs : Faleg, Alberto (1x), Abhishek Mari S (1x), Fielding, Paul (1x), Amand, Harry (1x), Aagaard, Jacob (1x), Duncan, Chris R (1x), Gallego Jimenez, Victoriano (1x), Adla, Diego (1x)

11.Ne5 — 1.8% (3 parties)

Ambassadeurs : Beikert, Guenther, Dr. (1x), Kallai, Gabor (1x), Iermito, Sebastian Dario (1x), Amed, Stephanie (1x), Kovalenko, Igor (1x), Shvets, Sergey (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	11.Nbd2	11.a5	11.e4	11.Ne5
<1800	4	100%	—	—	—
1800-2200	51	69%	25%	4%	2%
2200-2600	103	65%	23%	10%	2%

Évolution par décennie (% des parties)

Décennie	N parties	11.Nbd2	11.a5	11.e4	11.Ne5
1950s	5	60%	20%	20%	—
1960s	1	—	—	100%	—
1970s	2	50%	50%	—	—
1980s	3	100%	—	—	—
1990s	44	66%	20%	11%	2%
2000s	59	64%	29%	3%	3%
2010s	41	73%	17%	10%	—
2020s	15	67%	27%	7%	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
11.Nbd2	73%	67%	▼ -6.5%
11.a5	17%	27%	▲ +9.6%
11.e4	10%	7%	▼ -3.1%
11.Ne5	0%	0%	+0.0%

Parties historiques

11.Nbd2 — 67.1% (114 parties)

1952 — Incutto, Carlos vs Bartis, Gustavo — 0-1 — Buenos Aires ARG
1952 — Gruenfeld, Ernst vs O'Kelly, Albéric de Galway — 1/2-1/2 — Belgrade SRB
1954 — Von Gerkan, Hartwin vs Werner, Stephan — 1/2-1/2 — Bad Salzuflen
1972 — Booth, Stewart vs Wright, Anthony G — 1/2-1/2 — Melbourne AUS
1985 — Kallai, Gabor vs Lanc, Alois — 1/2-1/2 — Tbilisi GEO

11.a5 — 22.9% (39 parties)

1954 — Moskowitz, Jack vs Amand, Harry — 1/2-1/2 — Hollywood
1972 — Debarnot, Roberto vs Padevsky, Nikola — 1/2-1/2 — Skopje ol (Men) fin-A
1993 — Knuth, Hannes vs Nagendra, Rentala — 0-1 — Germany ch
1993 — Guliev, Sarhan vs Quist, Johan — 1/2-1/2 — Berlin GER
1993 — Renet, Olivier vs Conquest, Stuart C — 1/2-1/2 — it Clichy FRA

11.e4 — 8.2% (14 parties)

1954 — Fielding, Paul vs Amand, Harry — 0-1 — Hollywood
1962 — Faleg, Alberto vs Abhishek Mari S — 0-1 — Belgrade SRB
1995 — Vescovi, Giovanni vs Kasimdzhanov, Rustam — 0-1 — Halle wch-jr
1995 — Hebden, Mark L vs Hartman, Christer — 1/2-1/2 — Isle of Man IOM
1997 — Aagaard, Jacob vs Duncan, Chris R — 1-0 — Highgate ENG

11.Ne5 — 1.8% (3 parties)

1993 — Beikert, Guenther, Dr. vs Kallai, Gabor — 1-0 — Frankrijk tt
2004 — Iermito, Sebastian Dario vs Amed, Stephanie — 1-0 — Villa Martelli ARG
2005 — Kovalenko, Igor vs Shvets, Sergey — 1-0 — Evpatoria UKR