D27a — QGA: Classical, 6…a6

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 ○ Trait aux Blancs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Plans. dxc5 (Capture en c5, Frapper le centre adverse — 21 % des parties) ; a4 (21 % des parties) ; Bb3 (Fou actif (mobilité 5) — 20 % des parties) ; Qe2 (Pression sur colonne e — 15 % des parties) ; b3 (Préparer le fianchetto — 7 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

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Plans. ...Nc6 (Développer b8 — 33 % des parties) ; ...b5 (Expansion aile dame — 26 % des parties) ; ...cxd4 (Capture en d4, Occuper le centre — 10 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→e3, e3→d4	● b7→a6, f7→e6
Passés	—	—
Majorité	—	● aile dame 3v2

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e5 (2v0)	● d5 (3v1)
Cases faibles	—	—
Centre	● d4 (3v2), ● e5 (2v0)	● d5 (3v1), ● e4 (1v0)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● c	● d

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 1)
Bc4	● Bc4 Actif (mob. 7)
Bc8		● Bc8 Non développé (mob. 1)
Bf8		● Bf8 Non développé (mob. 2)
Paire de fous	● Oui	● Oui
Non développées	3 (● b1, ● c1, ● a1)	5 (● b8, ● c8, ● 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
10. Sinquefield Cup 2023 – Round 4.1 – Giri, Anish – 1/2-1/2 – Vachier-Lagrave, Maxime – G13 1. Nf3 d5 2. d4 Nf6 3. c4 dxc4 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Re1 Be7 8. dxc5 Bxc5 9. Qxd8+ Kxd8 10. Nc3 Ke7
1905 Ostende – Round 11 – Teichmann, Richard – 1/2-1/2 – Blackburne, Joseph – G35 1. d4 d5 2. c4 dxc4 3. Nf3 c5 4. e3 Nf6 5. Bxc4 e6 6. O-O a6 7. Be2 Nc6 8. Nc3 cxd4 9. exd4 Be7 10. Bg5 h6
1947 Hanau – Round ? – Nuernberg, Friedrich – 0-1 – Zemgalis, Elmars – G16 1. d4 d5 2. Nf3 Nf6 3. c4 dxc4 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qc2 Nbd7 8. Rd1 b5 9. dxc5 Bxc5 10. Bd3 Bb7
1966 La Habana olm fin-C – Round 11 – Colon Romero, Miguel – 1/2-1/2 – Myagmarsuren, Lkhamsuren – G70 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. h4 Nc6 8. Nc3 Be7 9. b3 O-O 10. Bb2 cxd4
2024 Superbet Chess Classic - Round 4 - Praggnanandhaa R - 1-0 - Giri Anish - G20 1. d4 1... d5 2. c4 2... dxc4 3. Nf3 3... Nf6 4. e3 4... e6 5. Bxc4 5... c5 6. O-O 6... a6 7. Be2 7... Nbd7 8. Nbd2 8... Be7 9. dxc5 9... Bxc5 10. Qc2 10... O-O
2024 Superbet Chess Classic - Round 7 - So Wesley - 1/2-1/2 - Abdusattorov Nodirbek - G33 1. d4 1... d5 2. c4 2... dxc4 3. e3 3... Nf6 4. Bxc4 4... e6 5. Nf3 5... a6 6. O-O 6... c5 7. Be2 7... Nbd7 8. Nc3 8... b5 9. d5 9... exd5 10. Nxd5 10... Bb7
2026 Tata Steel Chess Masters - Round 1.4 - Keymer, Vincent - 1-0 - Giri, Anish - G4 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Re1 Nc6 8. Nc3 Be7 9. dxc5 Qxd1 10. Rxd1 Bxc5
5. Sinquefield Cup 2017 – Round 2.2 – Aronian, Levon – 0-1 – Caruana, Fabiano – G7 1. d4 d5 2. Nf3 Nf6 3. c4 dxc4 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Be2 cxd4 8. exd4 Nc6 9. Nc3 Be7 10. Be3 Ng4
8. Sinquefield Cup 2021 – Round 5.3 – Mamedyarov, Shakhriyar – 1/2-1/2 – Dominguez Perez, Leinier – G23 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Re1 Nc6 8. Bd3 cxd4 9. exd4 Be7 10. Nc3 O-O
9. London Classic 2017 – Round 1.1 – Carlsen, Magnus – 1/2-1/2 – Caruana, Fabiano – G1 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 c5 6. O-O a6 7. Be2 Nbd7 8. Nc3 b6 9. e4 cxd4 10. Nxd4 Bb7
American Cup Blitz 2022 – Round 5.6 – Oparin, Grigoriy – 1/2-1/2 – Xiong, Jeffery – G29 1. d4 d5 2. c4 e6 3. Nf3 dxc4 4. e3 a6 5. Bxc4 Nf6 6. O-O c5 7. Re1 Nc6 8. Nc3 h6 9. d5 exd5 10. Nxd5 Ne4
FIDE Grand Swiss 2025 – Round 5 – Daneshvar Bardiya – 0-1 – Bacrot Etienne – G277 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Re1 b5 8. Bf1 cxd4 9. Nxd4 Bb4 10. Bd2 Bd6
Lindores Abbey Tal Memorial 2021 – Round 2.55 – Predke, Alexandr – 1-0 – Badelka, Olga – G109 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Re1 Nc6 8. Nc3 b5 9. Bd3 Bb7 10. a4 b4
Saint Louis Rapid 2022 – Round 1.5 – Aronian, Levon – 1/2-1/2 – Vachier-Lagrave, Maxime – G5 1. Nf3 d5 2. d4 Nf6 3. c4 dxc4 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Nbd2 cxd4 8. Nxd4 Be7 9. Be2 O-O 10. b3 b5
Superbet Blitz 2022 – Round 17.5 – Caruana, Fabiano – 1-0 – So, Wesley – G85 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Be2 cxd4 8. Nxd4 Be7 9. Nd2 O-O 10. b3 b5
Superbet Classic 2023 – Round 9.3 – Firouzja, Alireza – 1/2-1/2 – Vachier-Lagrave, Maxime – G42 1. Nf3 d5 2. d4 Nf6 3. c4 dxc4 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Re1 Be7 8. dxc5 Bxc5 9. Qxd8+ Kxd8 10. Bf1 Ke7
SuperUnited Blitz 2022 – Round 13.4 – Van Foreest, Jorden – 1/2-1/2 – So, Wesley – G64 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Re1 Nc6 8. Nc3 Be7 9. dxc5 Qxd1 10. Rxd1 Bxc5
SuperUnited Blitz 2023 – Round 7.4 – Lupulescu, Constantin – 1/2-1/2 – Anand, Viswanathan – G34 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Be2 Nbd7 8. b3 b6 9. Bb2 Bb7 10. Nbd2 Be7
SuperUnited Rapid 2023 – Round 3.1 – Lupulescu, Constantin – 0-1 – Anand, Viswanathan – G11 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Be2 cxd4 8. Nxd4 Be7 9. b3 O-O 10. Bb2 b5
World Blitz 2018 – Round 3.12 – Vitiugov, Nikita – 1/2-1/2 – Timofeev, Artyom – G144 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Be2 cxd4 8. Nxd4 Bd6 9. b3 O-O 10. Bb2 e5
World Blitz 2021 – Round 5.48 – Gukesh D – 0-1 – Timofeev, Artyom – G296 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 c5 6. O-O a6 7. Re1 Nc6 8. Nc3 Be7 9. dxc5 Qxd1 10. Rxd1 Bxc5
World Blitz 2022 – Round 11.37 – Shankland, Sam – 1-0 – Tsaruk, Maksim – G585 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 a6 6. O-O c5 7. Nbd2 Nc6 8. dxc5 Bxc5 9. a3 O-O 10. b4 Be7
World Blitz 2023 – Round 19.39 – Matlakov, Maxim – 1-0 – Dardha, Daniel – G1093 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 a6 5. Bxc4 e6 6. O-O c5 7. Re1 b5 8. Bf1 Bb7 9. a4 b4 10. Nbd2 cxd4
World Rapid 2019 – Round 14.15 – Cheparinov, Ivan – 1/2-1/2 – Le, Quang Liem – G885 1. d4 d5 2. Nf3 Nf6 3. c4 dxc4 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Re1 Nc6 8. Nc3 b5 9. Bd3 Bb7 10. a4 c4
World Rapid 2021 – Round 1.14 – Maghsoodloo, Parham – 1/2-1/2 – Aronian, Levon – G6 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Be2 Nbd7 8. b3 b6 9. Bb2 Bb7 10. Nbd2 Be7
World Rapid 2021 – Round 3.38 – Riazantsev, Alexander – 1/2-1/2 – Pichot, Alan – G164 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Be2 b5 8. a4 b4 9. b3 Bb7 10. Bb2 Nbd7
World Rapid 2021 – Round 5.10 – Cheparinov, Ivan – 1-0 – Aronian, Levon – G260 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. O-O c5 7. Re1 Nc6 8. Nc3 b5 9. Bd3 cxd4 10. exd4 Nb4
World Rapid 2021 – Round 5.55 – Gukesh D – 1-0 – Pichot, Alan – G302 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 a6 6. O-O c5 7. Re1 b5 8. Bf1 Bb7 9. a4 b4 10. Nbd2 Be7

D27a — Classical Defense, Main Line (1905)

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6

Les coups candidats

7.dxc5 — 21.0% (4323 parties) →

Ambassadeurs : Stevic, Hrvoje (42x), Kramnik, Vladimir (18x), Lintchevski, Daniil (17x), Nikolic, Predrag (17x), Kozul, Zdenko (16x), Rublevsky, Sergei (15x), Shcherbakov, Ruslan (14x), Ganguly, Surya Shekhar (14x)

7.a4 — 20.7% (4270 parties) →

Ambassadeurs : fperrot (19x), Portisch, Lajos (16x), Estrada Nieto, Julian (16x), Vladimirov, Yevgeniy (15x), Radulov, Ivan (15x), Lesiege, Alexandre (13x), jojac (13x), Gligoric, Sofija (12x)

7.Bb3 — 19.5% (4019 parties) →

Ambassadeurs : Tregubov, Pavel V. (24x), Anand, Viswanathan (22x), Chukanov, Igor Anatolievich (20x), Cvitan, Ognjen (17x), Tkachiev, Vladislav (17x), Karpatchev, Aleksandr (14x), Korchut, Adam (14x), Vaulin, Alexander P. (12x)

7.Qe2 — 15.3% (3146 parties) →

Ambassadeurs : Garcia Palermo, Carlos Horacio (17x), Golz, Werner (14x), Rashkovsky, Nukhim N (12x), Krallmann, Matthias (11x), Byrne, Robert E (10x), Suetin, Alexey S (10x), Pilnik, Herman (8x), Clarke, Peter (8x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	7.dxc5	7.a4	7.Bb3	7.Qe2
<1800	691	21%	26%	15%	14%
1800-2200	5692	20%	24%	21%	13%
2200-2600	11193	22%	18%	21%	14%
2600+	888	28%	8%	22%	6%

Évolution par décennie (% des parties)

Décennie	N parties	7.dxc5	7.a4	7.Bb3	7.Qe2
1950s	211	9%	11%	0%	70%
1960s	417	14%	29%	2%	45%
1970s	270	9%	51%	2%	30%
1980s	929	9%	38%	2%	35%
1990s	3356	11%	24%	12%	25%
2000s	6193	21%	23%	28%	13%
2010s	6221	28%	17%	26%	9%
2020s	3008	24%	10%	8%	7%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
7.dxc5	28%	24%	▼ -3.4%
7.a4	17%	10%	▼ -6.9%
7.Bb3	26%	8%	▼ -18.1%
7.Qe2	9%	7%	▼ -1.7%

Joueurs célèbres

Champions du monde dans cette position

Tal, Mikhail — 10 parties
Kasparov, Garry — 10 parties
Karpov, Anatoly — 10 parties
Anand, Viswanathan — 10 parties
Kramnik, Vladimir — 10 parties
Gukesh D — 8 parties
Botvinnik, Mikhail — 7 parties
Carlsen, Magnus — 7 parties
Hou, Yifan — 5 parties
Ju, Wenjun — 4 parties
Smyslov, Vladimir — 3 parties
Ding, Liren — 3 parties

Parties historiques

7.dxc5 — 21.0% (4323 parties)

1950 — Lilienthal, Andor vs Keres, Paul Petrovich — 1/2-1/2 — Budapest HUN
1950 — Trifunovic, Petar vs Devos, Paul — 1-0 — Dubrovnik CRO
1951 — Cross, James vs Evans, Larry — 1/2-1/2 — Forth Worth
1952 — Trifunovic, Petar vs Lundin, Erik — 1/2-1/2 — Helsinki olm
1952 — Vaitonis, Povilas vs Pilnik, Herman — 1/2-1/2 — Saltsjobaden SWE

7.a4 — 20.7% (4270 parties)

1950 — Gereben, Erno vs Sebestyen, Balazs — 1-0 — Budapest HUN
1950 — MULLER vs Kramer, Gerald — 1/2-1/2 — Dubrovnik olm
1951 — Ratner, Boris vs Kan, Ilya A — 1-0 — Leningrad RUS
1951 — Nedeljkovic, Srecko M vs Abdi, Andreas — 1/2-1/2 — Sarajevo BIH
1951 — Corral, Hector vs Muniz, Alexis — 1-0 — San Rafael

7.Bb3 — 19.5% (4019 parties)

1951 — German, Eugenio vs Muniz, Alexis — 1-0 — San Rafael
1962 — Filip, Miroslav vs Conrady, Alphonse — 1-0 — Varna olm
1962 — Eken, Max vs Filip, Miroslav — 1/2-1/2 — Varna olm
1962 — Sliwa, Bogdan vs Filip, Miroslav — 1/2-1/2 — Varna BUL
1963 — Botvinnik, Mikhail vs Petrosian, Tigran V. — 1/2-1/2 — Moskou wch-m

7.Qe2 — 15.3% (3146 parties)

1950 — Bolbochan, Julio vs Devos, Paul — 1-0 — Dubrovnik CRO
1950 — Honan, N. vs Akonde Marshall — 1-0 — England
1950 — Geller, Efim P. vs Alatortsev, Vladimir N. — 1/2-1/2 — Moskou ch-URS
1950 — Smyslov, Vasily vs Keres, Paul Petrovich — 1/2-1/2 — Budapest HUN
1950 — Van den Berg, Cees vs Van Steenis, Ir — 1-0 — Leiden NED

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D27a — QGA: Classical, 6…a6

♔ Point de vue Blancs

♚ Point de vue Noirs

10. Sinquefield Cup 2023 – Round 4.1 – Giri, Anish – 1/2-1/2 – Vachier-Lagrave, Maxime – G13

1905 Ostende – Round 11 – Teichmann, Richard – 1/2-1/2 – Blackburne, Joseph – G35

1947 Hanau – Round ? – Nuernberg, Friedrich – 0-1 – Zemgalis, Elmars – G16

1966 La Habana olm fin-C – Round 11 – Colon Romero, Miguel – 1/2-1/2 – Myagmarsuren, Lkhamsuren – G70

2024 Superbet Chess Classic – Round 4 – Praggnanandhaa R – 1-0 – Giri Anish – G20

2024 Superbet Chess Classic – Round 7 – So Wesley – 1/2-1/2 – Abdusattorov Nodirbek – G33

2026 Tata Steel Chess Masters – Round 1.4 – Keymer, Vincent – 1-0 – Giri, Anish – G4

5. Sinquefield Cup 2017 – Round 2.2 – Aronian, Levon – 0-1 – Caruana, Fabiano – G7

8. Sinquefield Cup 2021 – Round 5.3 – Mamedyarov, Shakhriyar – 1/2-1/2 – Dominguez Perez, Leinier – G23

9. London Classic 2017 – Round 1.1 – Carlsen, Magnus – 1/2-1/2 – Caruana, Fabiano – G1

American Cup Blitz 2022 – Round 5.6 – Oparin, Grigoriy – 1/2-1/2 – Xiong, Jeffery – G29

FIDE Grand Swiss 2025 – Round 5 – Daneshvar Bardiya – 0-1 – Bacrot Etienne – G277