D29a — QGA: Classical, 8…Bb7

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 * ○ Trait aux Blancs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Plans. Rd1 (59 % des parties) ; a4 (28 % des parties) ; Nc3 (Développer b1 — 11 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

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Plans. ...Nbd7 (Développer b8 — 75 % des parties) ; ...b4 (Expansion aile dame — 11 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→e3, e3→d4	● a6→b5, f7→e6
Passés	—	—
Majorité	—	● aile dame 3v2

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e5 (2v0)	● e4 (2v0), ● d5 (4v1)
Cases faibles	—	—
Centre	● e5 (2v0)	● d5 (4v1), ● e4 (2v0)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● c	● d

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 1)
Bb3	● Bb3 Actif (mob. 6)
Bb7		● Bb7 Actif (mob. 5)
Bf8		● Bf8 Non développé (mob. 2)
Paire de fous	● Oui	● Oui
Non développées	3 (● b1, ● c1, ● a1)	4 (● b8, ● 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
1937 Stockholm ol (Men) – Round 2 – Stahlberg, Gideon – 1/2-1/2 – Reshevsky, Samuel – G5 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. dxc5 Bxc5 10. Nc3 Nbd7
1967 Mar del Plata Open – Round 7 – Luckis, Marcos – 1-0 – Cafure, Emilio – G24 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 a6 6. O-O b5 7. Bb3 Bb7 8. Qe2 c5 9. dxc5 Bxc5 10. a4 Qb6

D29a — Classical Defense, Alekhine System, Main Line (1937)

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

Les coups candidats

9.Rd1 — 59.2% (1044 parties) →

Ambassadeurs : Garcia Palermo, Carlos Horacio (12x), ? (9x), Burmakin, Vladimir (8x), Gerusel, Mathias (7x), Dlugy, Maxim (6x), Krallmann, Matthias (6x), Suetin, Alexey S (5x), Ehlvest, Jaan (5x)

9.a4 — 27.8% (490 parties) →

Ambassadeurs : Chatalbashev, Boris (8x), Uhlmann, Wolfgang (7x), Jussupow, Artur (7x), Golz, Werner (6x), Sasikiran, Krishnan (6x), Kiriakov, Petr (5x), Weinstein, Raymond (4x), Portisch, Ferenc (4x)

9.Nc3 — 10.8% (190 parties) →

Ambassadeurs : Yakovich, Yuri (3x), Clarke, Peter (2x), Smyslov, Vasily (2x), Ree, Hans (2x), Mikhalchishin, Adrian (2x), Suetin, Alexey S (2x), Graf, Alexander (2x), Pavlovic, Milos (2x)

9.dxc5 — 1.6% (29 parties)

Ambassadeurs : Karpatchev, Aleksandr (2x), Amaro, Lucas Ibrair (1x), Cafiero, Michael (1x), Knezevic, Milorad (1x), Dobrovolsky, Ladislav (1x), Rolland, Alec (1x), Boness (1x), ? (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	9.Rd1	9.a4	9.Nc3	9.dxc5
<1800	50	64%	20%	14%	—
1800-2200	420	64%	24%	9%	2%
2200-2600	829	55%	34%	9%	2%
2600+	29	55%	45%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	9.Rd1	9.a4	9.Nc3	9.dxc5
1950s	65	45%	35%	20%	—
1960s	123	54%	28%	18%	1%
1970s	44	64%	16%	20%	—
1980s	210	76%	10%	12%	1%
1990s	556	56%	35%	8%	1%
2000s	447	57%	31%	9%	3%
2010s	257	62%	23%	11%	2%
2020s	61	62%	23%	13%	2%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
9.Rd1	62%	62%	+0.0%
9.a4	23%	23%	-0.4%
9.Nc3	11%	13%	▲ +2.6%
9.dxc5	2%	2%	-0.3%

Joueurs célèbres

Champions du monde dans cette position

Anand, Viswanathan — 5 parties
Botvinnik, Mikhail — 1 partie

Parties historiques

9.Rd1 — 59.2% (1044 parties)

1950 — Bolbochan, Julio vs Devos, Paul — 1-0 — Dubrovnik CRO
1950 — Bergqvist, Allan vs Shainswit, George — 1/2-1/2 — Dubrovnik olm
1951 — Novotelnov, Nikolai vs Flohr, Salo — 1-0 — Moskou ch-URS
1951 — Miguel, Nahuel vs Byrne, Robert E — 1/2-1/2 — New York, NY USA
1951 — Evans, Larry vs Byrne, Robert E — 1-0 — New York, NY USA

9.a4 — 27.8% (490 parties)

1950 — Bondarevsky, Igor vs Alatortsev, Vladimir N. — 0-1 — Moscow RUS
1950 — Kotov, Alexander vs Flohr, Salo — 1-0 — Budapest HUN
1950 — Petrosian, Tigran V. vs Smyslov, Vasily — 1/2-1/2 — Moskou ch-URS
1951 — Kopilov, Nikolay Georgiyevich vs Flohr, Salo — 1/2-1/2 — Moscow RUS
1951 — Kapu, Jeno vs Borloy, Karoly — 1/2-1/2 — Hungary ch

9.Nc3 — 10.8% (190 parties)

1950 — Honan, N. vs Akonde Marshall — 1-0 — England
1950 — Smyslov, Vasily vs Keres, Paul Petrovich — 1/2-1/2 — Budapest HUN
1950 — Winter, William vs Newman, Richard — 1-0 — Buxton
1952 — Porrecca, Giorgio vs Lokvenc, Josef — 1/2-1/2 — Helsinki FIN
1952 — Rapaka Samuel Paul vs Lasker, Edward — 1-0 — Havana CUB

9.dxc5 — 1.6% (29 parties)

1967 — Amaro, Lucas Ibrair vs Cafiero, Michael — 1-0 — Mar del Plata ARG
1981 — Knezevic, Milorad vs Dobrovolsky, Ladislav — 1/2-1/2 — Tatran Cup Stary Smokovec SVK
1984 — Rolland, Alec vs Boness — 0-1 — corr ch-USA
1987 — ? vs Dlugy, Maxim — 1/2-1/2 — Brussels BEL
1992 — Ilic, Stanimir M vs Palacios, Bobby — 1-0 — U2300 op Toronto ONT CAN

1937 Stockholm ol (Men) – Round 2 – Stahlberg, Gideon – 1/2-1/2 – Reshevsky, Samuel – G5

1967 Mar del Plata Open – Round 7 – Luckis, Marcos – 1-0 – Cafure, Emilio – G24