D25n — QGA: Janowski-Larsen, 6.h3 Bh5 7.Nc3 a6

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Bg4 5.Bxc4 e6 6.h3 Bh5 7.Nc3 a6 * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : majorité centre (2v1), case forte d4, case forte e5, Bc4 actif, paire de fous, colonne c.
Faiblesses adverses : Bh5 mauvais fou, Bf8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, 3 pièces non développées (C1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● Bd2 — Développer Bc1
● Rc — Tour sur colonne c

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : majorité aile_dame (3v2), case forte d5, avant-poste d5(C), paire de fous, colonne d.
Faiblesses adverses : Bc1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bf8 enfermé, 4 pièces non développées (B8, F8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...Nbd7 — Développer Nb8
● ...Be7 — Développer Bf8
● ...c6 — Rupture
● ...c5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

D25n — Janowski-Larsen

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Bg4 5.Bxc4 e6 6.h3 Bh5 7.Nc3 a6

Eval: [+0.44]

Les coups candidats

8.g4 — 55.4% (483 parties) →

Ambassadeurs : Kunin, Vitaly (11x), Gleyzer, Leonid (7x), Bagirov, Vladimir (5x), Hort, Vlastimil (5x), Kopasov, Evgeny (5x), Meister, Peter (4x), Mitev, Valentin (4x), Kozma, Julius (3x)

8.O-O — 34.6% (302 parties)

Ambassadeurs : Romanishin, Oleg M (7x), Matulovic, Milan (5x), Zieher, Hartmut (5x), Hort, Vlastimil (5x), Gleyzer, Leonid (5x), Kunsztowicz, Uwe (4x), Semcesen, Daniel (4x), Kunin, Vitaly (4x)

8.Be2 — 4.7% (41 parties)

Ambassadeurs : Degenhardt, Norbert (2x), Tukmakov, Vladimir B (2x), Seppelt, Alfred (1x), Szilagyi, Gyorgy Laszlo (1x), Jankovec, Ivan (1x), Milev, Zdravko (1x), Smyslov, Vladimir (1x), Nevednichy, Boris M (1x)

8.a4 — 3.0% (26 parties)

Ambassadeurs : Vranesic, Zvonko (1x), Schweber, Samuel (1x), Balcerowski, Witold (1x), Dobrzynski, Wojciech (1x), Drebes, Gerhard, Dr. (1x), Schroeter, Thomas Bernd (1x), Agzamov, Georgy (1x), Reyes, Juan (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	8.g4	8.O-O	8.Be2	8.a4
<1800	4	75%	25%	—	—
1800-2200	142	55%	34%	4%	4%
2200-2600	516	59%	31%	5%	3%
2600+	12	75%	17%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	8.g4	8.O-O	8.Be2	8.a4
1890s	1	—	100%	—	—
1930s	2	50%	50%	—	—
1940s	7	29%	57%	—	—
1950s	13	69%	31%	—	—
1960s	63	38%	41%	11%	3%
1970s	37	22%	57%	16%	—
1980s	107	53%	38%	3%	4%
1990s	122	53%	40%	2%	2%
2000s	183	62%	30%	3%	3%
2010s	269	63%	28%	5%	4%
2020s	68	50%	38%	6%	1%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
8.g4	63%	50%	▼ -13.2%
8.O-O	28%	38%	▲ +10.7%
8.Be2	5%	6%	▲ +1.0%
8.a4	4%	1%	▼ -2.6%

Joueurs célèbres

Champions du monde dans cette position

Tal, Mikhail — 2 parties
Alekhine, Alexander — 1 partie
Smyslov, Vladimir — 1 partie
Kasparov, Garry — 1 partie

Parties historiques

8.g4 — 55.4% (483 parties)

1938 — Nield Alan E vs Goldstein, Maurice Edwards — 0-1 — Sydney AUS
1947 — Bondarevsky, Igor vs Alatortsev, Vladimir N. — 1/2-1/2 — Leningrad ch-URS
1949 — Golombek, Harry vs Foltys, Jan — 0-1 — Trencianske Teplice SVK
1950 — Kottnauer, Cenek vs Gawlikowski, Stanislaw — 1/2-1/2 — Schiavno Zdroj
1951 — Pavey, Max vs Shainswit, George — 1-0 — New York, NY USA

8.O-O — 34.6% (302 parties)

1894 — Soleski vs Charousek, Rudolf — 0-1 — Corr.
1934 — Bogoljubow, Efim vs Alekhine, Alexander — 1/2-1/2 — Baden-Baden GER
1946 — Szentkiralyi Toth, Vince vs Füster, Géza — 0-1 — HUN
1947 — Sanguinetti, Ricardo vs Najdorf, Miguel — 0-1 — Mar del Plata ARG
1947 — Sokolsky, Alexey vs Ragozin, Viacheslav — 0-1 — Moscow RUS

8.Be2 — 4.7% (41 parties)

1964 — Degenhardt, Norbert vs Seppelt, Alfred — 1-0 — Ingolstadt
1964 — Milev, Zdravko vs Smyslov, Vladimir — 0-1 — Tel Aviv ISR
1966 — Nevednichy, Boris M vs Luik, Helmuth — 1-0 — Moscow Tch-SU
1969 — Szilagyi, Gyorgy Laszlo vs Jankovec, Ivan — 1-0 — Stary Smokovec SVK
1969 — Malich, Burkhard, Dr. vs Kupreichik, Viktor D — 1/2-1/2 — Schwedt/Oder

8.a4 — 3.0% (26 parties)

1964 — Vranesic, Zvonko vs Schweber, Samuel — 1/2-1/2 — Tel Aviv ISR
1967 — Balcerowski, Witold vs Dobrzynski, Wojciech — 0-1 — Szczecin ch POL
1980 — Bernard, Christophe vs Cursoux, Gerard — 1-0 — Puteaux
1984 — Kovacevic, Vlatko vs Marjanovic, Slavoljub — 1/2-1/2 — Novi Sad SRB
1985 — Agzamov, Georgy vs Reyes, Juan — 1-0 — Lima PER

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→e3, g2→h3, e3→d4	● b7→a6, f7→e6
Passés	—	—
Majorité	● centre 2v1	● aile_dame 3v2

Cases

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

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● c	● d

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 1)
Bc4	● Bc4 Actif (mob. 8)
Bh5		● Bh5 Mauvais (mob. 3)
Bf8		● Bf8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	3 (c1, a1, h1)	4 (b8, f8, a8, h8)

Sécurité du roi

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

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	semi-ouvert
Ruptures	● d4-d5, ● e3-e4	● …c7-c6, ● …c7-c5, ● …e6-e5

Partie
1944 Moskou ch-URS – Round 1 – Makogonov, Vladimir – 1/2-1/2 – Flohr, Salo – G13 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 Nf6 8. a3 Nbd7 9. Be2 c5 10. d5 e5
1947 Chigorin Memorial – Round 1 – Sokolsky, Alexey – 0-1 – Ragozin, Viacheslav – G7 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. Nc3 Nf6 7. h3 Bh5 8. O-O Nc6 9. Be2 Bd6 10. Ne5 Bxe2
1947 Mar del Plata – Round 12 – Sanguinetti, Ricardo – 0-1 – Najdorf, Miguel – G102 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. Nc3 Nf6 7. h3 Bh5 8. O-O Nc6 9. Be2 Bd6 10. e4 Bxf3
1948 Karlovy Vary – Round 9 – Richter, Edgar – 1/2-1/2 – Foltys, Jan – G92 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. h3 Bh5 6. Bxc4 e6 7. Nc3 Nf6 8. O-O Nc6 9. b3 Bd6 10. Bb2 O-O
1952 JUG Ch – Round 15 – Gligorić, Svetozar – 1/2-1/2 – Andric, Dragoslav – G93 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. h3 Bh5 6. Nc3 Nf6 7. Bxc4 e6 8. O-O Nc6 9. Be2 Bg6 10. Nh4 Be7
1952 Vienna 5253 – Round ? – Rabar, Braslav – 1/2-1/2 – Soluch, Leopold – G7 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. h3 Bh5 6. Bxc4 e6 7. Nc3 Nf6 8. O-O Nc6 9. Be2 Bd6 10. Qb3 O-O
1962 Bucharest – Round 11 – Kholmov, Ratmir D – 1-0 – Sajtar, Jaroslav – G54 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 Nf6 8. O-O Nc6 9. Qe2 Bd6 10. g4 Bg6
1963 Leningrad ch-URS – Round 1 – Bronstein, David I – 1/2-1/2 – Stein, Leon Rico – G27 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. b3 Bd6 10. Bb2 O-O
1963 Leningrad ch-URS – Round 1 – Geller, Efim P – 1-0 – Zakharov, Alexander V – G31 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. Be2 Bd6 10. a3 O-O
1964 Tel Aviv olm fin-A – Round 4 – Vranesic, Zvonko – 1/2-1/2 – Schweber, Samuel – G72 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. Nc3 a6 7. h3 Bh5 8. a4 Nc6 9. O-O Be7 10. Be2 O-O
1964 Tel Aviv olm fin-A – Round 6 – Milev, Zdravko – 0-1 – Smyslov, Vladimir – G118 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. h3 Bh5 6. Bxc4 e6 7. Nc3 a6 8. Be2 Nc6 9. a3 Bd6 10. e4 Bxf3
1965 Budapest HUN – Round ? – Sokolov, Vladimir – 1-0 – Sapi, Laszlo – G38 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. Be2 Bd6 10. a3 O-O
1965 Hamburg etc – Round 9 – Voiculescu, Paul – 0-1 – Buljovcic, Ivan – G130 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. a3 Nc6 9. b4 Bd6 10. Bb2 O-O
1965 Sarajevo – Round 11 – Uhlmann, Wolfgang – 1/2-1/2 – Matulovic, Milan – G74 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. h3 Bh5 6. Bxc4 e6 7. Nc3 a6 8. O-O Nc6 9. Be2 Bd6 10. a3 O-O
1965 Sarajevo – Round 4 – Malich, Burkhard, Dr. – 1/2-1/2 – Mihaljcisin, Mihajlo – G35 1. d4 d5 2. Nf3 Nf6 3. c4 dxc4 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. Be2 Bd6 10. a3 O-O
1966 CSR Ch Int – Round 6 – Jansa, Vlastimil – 1/2-1/2 – Hort, Vlastimil – G8 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. Be2 Bd6 10. a3 O-O
1966 Santa Monica – Round 2 – Najdorf, Miguel – 1-0 – Ivkov, Borislav – G10 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. h3 Bh5 6. Bxc4 e6 7. Nc3 a6 8. O-O Nc6 9. Be2 Bd6 10. b3 O-O
1967 October Revolution 50 – Round 1 – Hort, Vlastimil – 1/2-1/2 – Suetin, Alexey S – G14 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. Be2 Bd6 10. b3 O-O
1967 Reggio Emilia 6768 10th – Round 5 – Bertok, Mario Jr. – 1/2-1/2 – Matulovic, Milan – G16 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. Be2 Bd6 10. b3 Qe7
1967 Rubinstein Memorial – Round 2 – Schmidt, Waldemar – 0-1 – Hort, Vlastimil – G7 1. d4 Nf6 2. Nf3 d5 3. c4 dxc4 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. Be2 Bd6 10. b3 O-O
1967 Rubinstein Memorial – Round 7 – Uhlmann, Wolfgang – 1-0 – Schmidt, Waldemar – G27 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. Nc3 a6 7. h3 Bh5 8. O-O Nc6 9. Be2 Bd6 10. b3 O-O
1967 Sousse Interzonal – Round 22 – Reshevsky, Samuel – 1-0 – Barczay, Laszlo – G204 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. Nc3 a6 7. h3 Bh5 8. O-O Nc6 9. Be2 Bd6 10. b3 O-O
1967 Szczecin ch POL – Round 14 – Balcerowski, Witold – 0-1 – Dobrzynski, Wojciech – G62 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. Nc3 a6 7. h3 Bh5 8. a4 Nc6 9. Be2 Bd6 10. O-O O-O
1967 URS Team Ch – Round 1 – Nei, Iivo – 1-0 – Mnatsakanian, Eduard A – G9 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. Re1 Bd6 10. e4 Bxf3
1968 Alma Ata ch-URS – Round 2 – Podgaets, Mikhail – 1/2-1/2 – Bagirov, Vladimir – G37 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 Nf6 8. O-O c5 9. Be2 Nc6 10. Ne5 Bxe2
1968 Buenos Aires – Round 11 – Ocampo, Raul – 1-0 – Palermo, Vicente – G74 1. Nf3 d5 2. d4 Nf6 3. c4 dxc4 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nbd7 9. e4 c5 10. e5 cxd4
1968 IBM I – Round 11 – Marovic, Drazen – 1/2-1/2 – Ivkov, Borislav – G39 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. Nc3 a6 7. h3 Bh5 8. O-O Nc6 9. Be2 Bd6 10. b3 O-O
1968 Skopje/Ohrid – Round 5 – Gheorghiu, Florin – 0-1 – Nicevski, Risto – G38 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. Qb3 Bxf3 9. gxf3 b5 10. Be2 Nbd7
1969 Buesum – Round 2 – Bobotsov, Milko G – 1/2-1/2 – Gerusel, Mathias – G3 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 Nf6 8. O-O Nc6 9. Be2 Bd6 10. a3 O-O
1969 Buesum – Round 6 – Gerusel, Mathias – 1-0 – Kestler, Hans-Guenther – G15 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O Nc6 9. Be2 Be7 10. a3 O-O
1969 Stary Smokovec – Round 3.4 – Szilagyi, Gyorgy Laszlo – 1-0 – Jankovec, Ivan – G12 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. Be2 Nc6 9. O-O Bd6 10. b3 O-O
1970 IBM – Round 8 – Uhlmann, Wolfgang – 1/2-1/2 – Hort, Vlastimil – G28 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. Nc3 a6 7. h3 Bh5 8. O-O Nc6 9. Be2 Bd6 10. b3 O-O
1975 URS Team Ch – Round 3 – Bronstein, David Ionovich – 1/2-1/2 – Govashelishvili, Genadij – G60 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. e4 Bxf3 9. gxf3 Nc6 10. Be3 Qd7
IBM 1978 – Round 8 – Browne, Walter Shawn – 0-1 – Romanishin, Oleg M – G22 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. h3 Bh5 7. Nc3 a6 8. O-O c5 9. Be2 Nc6 10. Ne5 Bxe2

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