A39l — English: Symmetrical, Main Line 7.d4, 10.Qd2

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d4 cxd4 8.Nxd4 Nxd4 9.Qxd4 d6 10.Qd2 * ● Trait aux Noirs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plan principal. Exploiter la case forte e4….

Atouts. Les Blancs s'appuient sur une majorité de pions à l'aile_dame (3 contre 2), les cases fortes e4, f4, b5 et d5, un fou actif en g2, la paire de fous et la colonne semi-ouverte d.

Côté adverse. Les fous enfermés en g7 et c8.

En contrepartie. Plusieurs pièces dorment encore (le fou c1 et la tour a1).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plan principal. Exploiter la case forte g4….

Atouts. Les Noirs s'appuient sur une majorité de pions à l'centre (2 contre 1), les cases fortes g4 et f5, la paire de fous et la colonne semi-ouverte c.

Côté adverse. Le fou enfermé en c1.

En contrepartie. Plusieurs pièces dorment encore (le fou c8 et la tour a8).

Plans. ...Bf5 (Développer Bc8) ; ...d5 (Rupture) ; ...e6 (Rupture) ; ...e5 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→g3, h2→g3	● e7→d6, f7→g6, h7→g6
Passés	—	—
Majorité	● aile_dame 3v2	● centre 2v1

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e4 (2v1), ● f4 (2v0), ● b5 (2v0), ● d5 (4v1)	● g4 (2v0), ● f5 (2v0)
Cases faibles	—	—
Centre	● d4 (1v0), ● d5 (4v1), ● e4 (2v1)	● e5 (1v0)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● d	● c

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bg2	● Bg2 Actif (mob. 7)
Bg7		● Bg7 Enfermé (mob. 2)
Bc8		● Bc8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	2 (● c1, ● a1)	2 (● c8, ● a8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Roqué	● Roqué
Droits de roque	—	—

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	semi-ouvert
Ruptures	● c4-c5, ● e2-e3, ● f2-f3	● …d6-d5, ● …e7-e6, ● …e7-e5

Partie
1933 Folkestone Olympiad 5th – Round 4.11 – Rejfir, Josef – 1/2-1/2 – Glass, Eduard – G34 1. c4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. g3 Bg7 7. Bg2 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Qb6
1939 Bad Elster – Round 3 – Lokvenc, Josef – 1/2-1/2 – Roess, L. – G10 1. Nf3 Nf6 2. c4 c5 3. Nc3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1944 Brno ch CZE – Round 3 – Sajtar, Jaroslav – 1/2-1/2 – Pachman, Ludek – G3 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 c5 6. O-O cxd4 7. Nxd4 Nc6 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 Qc7
1952 Helsinki olm – Round 1 – Pithart, Frantisek – 1-0 – Jost, Felix – G290 1. Nf3 Nf6 2. c4 c5 3. g3 Nc6 4. Bg2 g6 5. O-O Bg7 6. d4 cxd4 7. Nxd4 O-O 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1953 Venice – Round 6 – Udovcic, Mijo – 1-0 – Szabados, Eugenio – G14 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 Nc6 5. Nc3 g6 6. g3 Bg7 7. Bg2 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Qc7
1956 Marianske Lazne/Praha – Round 7 – Ståhlberg, Gideon – 1-0 – Ujtelky, Maximilian – G49 1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O c5 6. d4 cxd4 7. Nxd4 Nc6 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1957 New York ch-USA – Round 12 – Lombardy, William J – 0-1 – Seidman, Herbert – G9 1. Nf3 Nf6 2. g3 g6 3. Bg2 c5 4. O-O Bg7 5. c4 O-O 6. d4 cxd4 7. Nxd4 Nc6 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 Qb6
1960 BUL-ch14 Sofia BUL – Round 10 – Bobotsov, Milko G – 1/2-1/2 – Prahov, Valentin – G37 1. c4 Nf6 2. Nc3 c5 3. g3 Nc6 4. Bg2 g6 5. Nf3 Bg7 6. d4 cxd4 7. Nxd4 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1960 Sarajevo – Round 1 – Matulovic, Milan – 1-0 – Trifunovic, Petar – G1 1. c4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. g3 Bg7 7. Bg2 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1961 Zevenaar – Round 7 – Langeweg, Kick – 1/2-1/2 – Milic, Bozidar – G51 1. c4 c5 2. Nc3 Nf6 3. Nf3 g6 4. d4 cxd4 5. Nxd4 Bg7 6. g3 Nc6 7. Bg2 Nxd4 8. Qxd4 O-O 9. O-O d6 10. Qd2 Rb8
1962 Asztalos Memorial 5th – Round 1 – Kolarov, Atanas Stefanov – 1/2-1/2 – Pirc, Vasja – G3 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 Nc6 5. Nc3 g6 6. g3 Bg7 7. Bg2 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Be6
1962 Asztalos Memorial 5th – Round 15 – Pirc, Vasja – 1/2-1/2 – Lengyel, Levente – G116 1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. O-O Nc6 5. c4 d6 6. Nc3 Nf6 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 O-O 10. Qd2 Be6
1962 Asztalos Memorial 5th – Round 8 – Pirc, Vasja – 1/2-1/2 – Portisch, Lajos – G60 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. c4 Nf6 6. Nc3 O-O 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Be6
1962 It Bamberg GER – Round 7 – Kestler, Hans-Guenther – 1/2-1/2 – Parma, Bruno – G31 1. c4 Nf6 2. Nc3 c5 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nc6 6. O-O O-O 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1962 Marianske Lazne – Round 6 – Hort, Vlastimil – 1/2-1/2 – Ghitescu, Theodor – G39 1. c4 c5 2. Nc3 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nc6 6. d4 cxd4 7. Nxd4 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1963 Hoogovens – Round 16 – Stahlberg, Gideon – 1/2-1/2 – Parma, Bruno – G135 1. Nf3 c5 2. c4 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. g3 Nxd4 6. Qxd4 g6 7. Bg2 Bg7 8. O-O O-O 9. Nc3 d6 10. Qd2 Rb8
1963 Leningrad ch-URS – Round ? – Korchnoi, Viktor – 1/2-1/2 – Geller, Efim P – G143 1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. g3 g6 5. Bg2 Bg7 6. d4 cxd4 7. Nxd4 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Be6
1964 Kecskemet zt – Round 1 – Damjanovic, Marko – 1-0 – Hort, Vlastimil – G16 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. g3 Bg7 5. Bg2 O-O 6. O-O cxd4 7. Nxd4 Nc6 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 a6
1964 POL-ch21 Warsaw POL – Round 5 – Plater Zyberg, Ambre – 0-1 – Balcerowski, Witold – G13 1. g3 g6 2. Bg2 Bg7 3. c4 c5 4. Nc3 Nc6 5. Nf3 Nf6 6. d4 cxd4 7. Nxd4 Nxd4 8. Qxd4 O-O 9. O-O d6 10. Qd2 a6
1964 Zagreb – Round 4 – Bobotsov, Milko G – 1/2-1/2 – Parma, Bruno – G19 1. c4 c5 2. Nc3 Nc6 3. Nf3 Nf6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1965 Capablanca Memorial – Round 6 – Bilek, Istvan – 1/2-1/2 – Pietzsch, Wolfgang – G64 1. Nf3 Nf6 2. g3 c5 3. Bg2 Nc6 4. c4 g6 5. d4 cxd4 6. Nxd4 Bg7 7. Nc3 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 a6
1965 FRG CupT – Round 1.1 – Lossa, Guenther – 1/2-1/2 – Kieninger, Georg – G2 1. c4 Nf6 2. Nf3 c5 3. Nc3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1965 Harrachov U26 – Round 1 – Smejkal, Jan – 1-0 – Janata, Michael – G1 1. c4 Nf6 2. Nf3 c5 3. g3 g6 4. Bg2 Bg7 5. O-O Nc6 6. d4 O-O 7. Nc3 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1965 Harrachov U26 – Round 9 – Tichy, Vladimir – 1/2-1/2 – Smejkal, Jan – G25 1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 c5 5. Nf3 Nc6 6. d4 cxd4 7. Nxd4 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Be6
1965 Kiel Open – Round 10 – Kestler, Hans-Guenther – 1-0 – Lohmann, Heinrich – G46 1. c4 c5 2. Nc3 Nc6 3. Nf3 Nf6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Qc7
1965 New York ch-USA – Round 3 – Burger, Kim – 1/2-1/2 – Zuckerman, Bernard – G7 1. Nf3 c5 2. c4 Nc6 3. Nc3 Nf6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Be6
1965 POL Ch 22th – Round 4 – Brzozka, Stefan – 1-0 – Marszalek, Rafal – G17 1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1965 SWE Ch – Round 13 – Gonzalez Vidal, Yuri – 1/2-1/2 – Fridh, Anton – G40 1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 c5 5. Nf3 Nc6 6. O-O O-O 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1966 Hoogovens 28th – Round 12 – Bachtiar, Ahmad Ina – 0-1 – Szabo, Ladislav – G34 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 c5 6. O-O cxd4 7. Nxd4 Nc6 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1966 Hungary – Round 1 – Filep, Tibor – 0-1 – Bokor, Istvan – G2 1. c4 Nf6 2. Nc3 c5 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nc6 6. d4 cxd4 7. Nxd4 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Qc7
1966 La Habana olm fin-A – Round 3 – Bilek, Istvan – 1/2-1/2 – Bolbochan, J. – G9 1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. O-O O-O 5. d4 c5 6. c4 cxd4 7. Nxd4 Nc6 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 Be6
1966 Le Havre – Round 10 – Gereben, Erno – 1/2-1/2 – Thiellement, Andre – G45 1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. c4 c5 5. Nc3 Nc6 6. d4 cxd4 7. Nxd4 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1967 YUG-URS women – Round 12 – Kushnir, Alla – 1/2-1/2 – Liljak, Milka – G17 1. Nf3 Nf6 2. g3 c5 3. c4 g6 4. Bg2 Bg7 5. O-O O-O 6. d4 cxd4 7. Nxd4 Nc6 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 a6
1968 It Buesum GER – Round 2 – Kolarov, Atanas S. – 1/2-1/2 – Tringov, Georgi P – G10 1. Nf3 Nf6 2. g3 c5 3. Bg2 Nc6 4. O-O g6 5. d4 cxd4 6. Nxd4 Bg7 7. c4 O-O 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 a6
1968 Lugano olm - Round 1 - Pfleger, Helmut, Dr. - 1/2-1/2 - Janata, Michael - G471 1. Nf3 Nf6 2. c4 c5 3. g3 Nc6 4. Bg2 g6 5. O-O Bg7 6. d4 cxd4 7. Nxd4 Nxd4 8. Qxd4 O-O 9. Nc3 d6 10. Qd2 Be6
1968 New York ch-USA – Round 8 – Weinberger, Tibor – 1/2-1/2 – Zuckerman, Bernard – G46 1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. c4 O-O 5. Nc3 c5 6. d4 cxd4 7. Nxd4 Nc6 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1969 Buenos Aires – Round 5 – Schweber, Samuel – 1/2-1/2 – Pelikán, Jiří – G30 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 g6 5. Nc3 Nc6 6. g3 Bg7 7. Bg2 O-O 8. O-O Nxd4 9. Qxd4 d6 10. Qd2 Rb8
1969 Vrsac – Round 15 – Csom, Istvan – 1/2-1/2 – Janosevic, Dragoljub – G92 1. Nf3 c5 2. g3 Nf6 3. Bg2 Nc6 4. O-O g6 5. d4 cxd4 6. Nxd4 Bg7 7. c4 O-O 8. Nc3 Nxd4 9. Qxd4 d6 10. Qd2 Rb8

A39l — Symmetrical Main Line

1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d4 cxd4 8.Nxd4 Nxd4 9.Qxd4 d6 10.Qd2

Les coups candidats

10…Rb8 — 43.0% (378 parties)

Ambassadeurs : Parma, Bruno (4x), Bobotsov, Milko G (3x), Csom, Istvan (2x), Lokvenc, Josef (1x), Roess, L. (1x), Hort, Vlastimil (1x), Ghitescu, Theodor (1x), Langeweg, Kick (1x)

10…a6 — 19.8% (174 parties)

Ambassadeurs : Arkell, Keith C (2x), Manakova, Maria (2x), Buenafe Moya, Javier (2x), Burg, Brent (2x), Sande, Oystein (1x), Balaskas, Panayotis (1x), Stefanov, Josif Jovchev (1x), Popov, Luben (1x)

10…Qc7 — 16.7% (147 parties)

Ambassadeurs : Hiebler, Laura (2x), Sajtar, Jaroslav (1x), Pachman, Ludek (1x), Kestler, Hans-Guenther (1x), Lohmann, Heinrich (1x), Bisguier, Arthur B (1x), Shipman, Walter (1x), Reshko, Aron (1x)

10…Be6 — 12.5% (110 parties)

Ambassadeurs : Pirc, Vasja (3x), Geller, Efim P. (2x), Pfleger, Helmut, Dr. (2x), Hernandez Onna, Roman (2x), Sukuba, Zdenko (2x), Fernandez Murga, Roberto (1x), Fernandez, Ruben (1x), Korchnoi, Viktor (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	10…Rb8	10…a6	10…Qc7	10…Be6
<1800	14	57%	29%	7%	—
1800-2200	376	45%	19%	22%	6%
2200-2600	331	38%	23%	11%	18%
2600+	3	67%	—	—	33%

Évolution par décennie (% des parties)

Décennie	N parties	10…Rb8	10…a6	10…Qc7	10…Be6
1930s	2	50%	—	—	—
1940s	1	—	—	100%	—
1950s	9	22%	—	44%	11%
1960s	48	42%	15%	12%	29%
1970s	29	41%	21%	10%	21%
1980s	43	40%	19%	19%	21%
1990s	145	41%	21%	18%	14%
2000s	245	49%	23%	13%	9%
2010s	298	41%	18%	18%	11%
2020s	60	42%	20%	22%	5%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
10…Rb8	41%	42%	▲ +0.7%
10…a6	18%	20%	▲ +1.5%
10…Qc7	18%	22%	▲ +3.5%
10…Be6	11%	5%	▼ -6.4%

Parties historiques

10…Rb8 — 43.0% (378 parties)

1939 — Lokvenc, Josef vs Roess, L. — 1/2-1/2 — Bad Elster
1952 — Pithart, Frantisek vs Jost, Felix — 1-0 — Helsinki olm
1956 — Ståhlberg, Gideon vs Ujtelky, Maximilian — 1-0 — Marianske Lazne
1960 — Matulovic, Milan vs Trifunovic, Petar — 1-0 — Sarajevo BIH
1960 — Bobotsov, Milko G vs Prahov, Valentin — 1/2-1/2 — BUL-ch14 Sofia BUL

10…a6 — 19.8% (174 parties)

1964 — Stefanov, Josif Jovchev vs Popov, Luben — 1-0 — Sofia BUL
1964 — Damjanovic, Marko vs Hort, Vlastimil — 1-0 — Kecskemet HUN
1964 — Plater Zyberg, Ambre vs Balcerowski, Witold — 0-1 — POL-ch21 Warsaw POL
1965 — Bilek, Istvan vs Pietzsch, Wolfgang — 1/2-1/2 — Havana CUB
1967 — Kushnir, Alla vs Liljak, Milka — 1/2-1/2 — Budva MNE

10…Qc7 — 16.7% (147 parties)

1944 — Sajtar, Jaroslav vs Pachman, Ludek — 1/2-1/2 — Brno ch CZE
1950 — Denker, Arnold S vs Rabar, Bakhtyar Hamasaleh — 1-0 — Radio
1953 — Udovcic, Mijo vs Szabados, Eugenio — 1-0 — Venice ITA
1955 — Vyslouzil, Antonin vs Betak Miroslav — 1-0 — Prague CZE
1956 — Bisguier, Arthur B vs Shipman, Walter — 1-0 — Detroit, MI USA

10…Be6 — 12.5% (110 parties)

1958 — Kozma, Julius vs Fuderer, Andrija — 0-1 — 13th Olympiad final A
1962 — Kolarov, Atanas Stefanov vs Pirc, Vasja — 1/2-1/2 — Kecskemet HUN
1962 — Pirc, Vasja vs Lengyel, Levente — 1/2-1/2 — Kecskemet HUN
1962 — Pirc, Vasja vs Portisch, Lajos — 1/2-1/2 — Kecskemet HUN
1963 — Korchnoi, Viktor vs Geller, Efim P. — 1/2-1/2 — Leningrad ch-URS

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