B28a — Sicilian: O’Kelly Variation

1.e4 c5 2.Nf3 a6 * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : paire de fous.
Faiblesses adverses : arriéré b7, Bc8 enfermé, Bf8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, Bf1 enfermé, 5 pièces non développées (B1, C1, F1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● Nbd2 — Développer Nb1
● d3 — Libérer Bc1
● Bd3 — Développer Bf1
● h3 — Empêcher ...Bg4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : paire de fous.
Faiblesses adverses : Bc1 enfermé, Bf1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, Bf8 enfermé, arriéré b7, 6 pièces non développées (B8, G8, C8, F8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...d6 — Libérer Bc8
● ...Nc6 — Développer Nb8
● ...Nf6 — Développer Ng8
● ...Bd6 — Développer Bf8

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

B28a — O’Kelly Variation

1.e4 c5 2.Nf3 a6

Eval: [+0.39]

Les coups candidats

3.d4 — 31.4% (8330 parties) →

Ambassadeurs : Zalys, Ignas (41x), Collins, Richard Arnold (34x), Borda, Lajos (19x), Bakalar, Jan (19x), Damia, Angelo (17x), Frey, Walter (16x), Gerhardt, Peter-Michael (16x), Morilla Morilla, Candido (15x)

3.c3 — 26.4% (7019 parties) →

Ambassadeurs : Csom, Istvan (44x), Borda, Lajos (27x), Kurajica, Bojan (27x), Green, Michael (26x), Ackermann, Hans Werner (25x), Durán Vallverdú, Joan (25x), Analiev, Dimitar (20x), Nestorovic, Nikola (17x)

3.c4 — 21.7% (5764 parties) →

Ambassadeurs : Csom, Istvan (29x), Franklin, Michael J (23x), Vasilevich, Tatjana (21x), Borda, Lajos (18x), Ardeleanu, Alin (16x), Manak, Jozef (15x), Cordova, Emilio (14x), Green, Michael (14x)

3.Nc3 — 10.7% (2844 parties) →

Ambassadeurs : Csom, Istvan (18x), Bakalar, Jan (10x), Zuluaga Mancilla, Cesar (10x), Tu, Hoang Thai (9x), Vasilevich, Tatjana (9x), Franklin, Michael J (8x), Kurajica, Bojan (8x), Karimov, Farukh (8x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	3.d4	3.c3	3.c4	3.Nc3
<1800	1402	50%	20%	10%	9%
1800-2200	11579	34%	25%	22%	9%
2200-2600	7896	13%	35%	28%	15%
2600+	117	3%	51%	21%	6%

Évolution par décennie (% des parties)

Décennie	N parties	3.d4	3.c3	3.c4	3.Nc3
1850s	2	50%	—	—	—
1900s	1	100%	—	—	—
1910s	2	50%	—	—	—
1920s	7	86%	—	14%	—
1930s	4	25%	—	—	—
1940s	28	39%	11%	36%	4%
1950s	248	42%	19%	24%	7%
1960s	537	41%	23%	16%	12%
1970s	481	29%	24%	25%	14%
1980s	726	28%	29%	23%	11%
1990s	3489	37%	22%	21%	9%
2000s	8033	35%	24%	20%	11%
2010s	9965	30%	28%	21%	11%
2020s	3033	17%	33%	30%	9%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
3.d4	30%	17%	▼ -12.5%
3.c3	28%	33%	▲ +4.6%
3.c4	21%	30%	▲ +8.8%
3.Nc3	11%	9%	▼ -2.2%

Joueurs célèbres

Champions du monde dans cette position

Hou, Yifan — 10 parties
Euwe, Max — 9 parties
Tal, Mikhail — 9 parties
Carlsen, Magnus — 5 parties
Ju, Wenjun — 4 parties
Karpov, Aleksandr — 2 parties
Kasparov, Garry — 2 parties
Smyslov, Vladimir — 1 partie
Karpov, Anatoly — 1 partie
Anand, Viswanathan — 1 partie

Parties historiques

3.d4 — 31.4% (8330 parties)

1858 — Cochrane, John Miles vs Somacarana — 1-0 — Calcutta IND
1905 — Koehler, Gustav Henschel vs Marshall, Frank — 0-1 — New York, NY USA
1911 — Hromadka, Karel vs Hafe — 1-0 — Cologne GER
1921 — Spielmann, Rudolf vs Tartakower, Savielly — 1-0 — Vienna m1 Vienna AUT
1921 — Spielmann, Rudolf vs Tartakower, Savielly — 1-0 — Vienna AUT

3.c3 — 26.4% (7019 parties)

1949 — Foltys, Jan vs Prins, Lodewijk — 1/2-1/2 — Venice ITA
1949 — Schifferdecker, Wilhelm vs Euwe, Max — 1-0 — Wiesbaden GER
1949 — Simagin, Vladimir vs Barcza, Gedeon — 1/2-1/2 — Budapest HUN
1950 — Unzicker, Wolfgang vs Beni, Alfred — 1-0 — Dubrovnik CRO
1950 — Pachman, Ludek vs Mueller, Hans — 1-0 — Venice ITA

3.c4 — 21.7% (5764 parties)

1922 — Euwe, Max vs Tartakower, Savielly — 0-1 — London ENG
1945 — Haberditz, Hans vs Rautenberg, Wilhelm — 1-0 — Vienna AUT
1947 — Taimanov, Mark vs Kuzminykh, Evgeny — 1-0 — Leningrad RUS
1947 — Radojcic, Miroslav vs Tot, Bora — 0-1 — Ljubljana
1948 — Acebey Michel, Veroska vs O'Kelly de Galway, Alberic — 1/2-1/2 — Buenos Aires ARG

3.Nc3 — 10.7% (2844 parties)

1949 — Fletzer, Gino vs Rossolimo, Nicolas — 0-1 — Venice ITA
1950 — Paoli, Enrico vs Tot, Bora — 1/2-1/2 — Vienna AUT
1950 — Rossolimo, Nicolas vs Steiner, Heinrich Jun. — 1-0 — Venice ITA
1951 — Eastman, George vs Martin, Raymond — 1-0 — Fort Worth, TX USA
1951 — Medina-Garcia, Antonio vs Fuentes Garcia, Juan Manuel — 0-1 — Madrid ESP

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	● b7
Chaînes	—	● b7→a6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	—
Cases faibles	—	—
Centre	● d5 (1v0), ● e5 (1v0)	—

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bf1	● Bf1 Non développé (mob. 5)
Bc8		● Bc8 Non développé (mob. 0)
Bf8		● Bf8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	5 (b1, c1, f1, a1, h1)	6 (b8, g8, c8, 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	● c2-c3, ● d2-d3, ● e4-e5	● …c5-c4, ● …d7-d6, ● …d7-d5, ● …e7-e6, ● …e7-e5, ● …f7-f6, ● …f7-f5

Partie
1936 Muenchen ol – Round 17 – Kaila, Osmo – 1-0 – Tot, Bora – G48 1. e4 c5 2. Nf3 a6 3. b4 d6 4. bxc5 dxc5 5. a4 Nc6 6. Bb2 Bg4 7. Be2 Nf6 8. d3 e6 9. Nbd2 Be7 10. h3 Bh5
1949 Oldenburg – Round 8 – Wade, Robert G – 0-1 – O'Kelly de Galway, Alberic – G29 1. e4 c5 2. Nf3 a6 3. g3 Nc6 4. Bg2 Nf6 5. Nc3 d5 6. exd5 Nxd5 7. O-O Nxc3 8. bxc3 e6 9. c4 Be7 10. Bb2 O-O
1949 Venice – Round 1 – Stalda, Giuseppe – 0-1 – Szabo, Ladislav – G8 1. e4 c5 2. Nf3 a6 3. b4 d6 4. b5 e6 5. Nc3 Be7 6. Be2 Nd7 7. O-O Ngf6 8. d4 cxd4 9. Nxd4 Qc7 10. Bb2 O-O
1949 Venice – Round 1 – Stalda, Giuseppe – 0-1 – Szabo, Laszlo – G7 1. e4 c5 2. Nf3 a6 3. b4 d6 4. b5 e6 5. Nc3 Be7 6. Be2 Nd7 7. O-O Ngf6 8. d4 cxd4 9. Nxd4 Qc7 10. Bb2 O-O
1950 Hungary – Round 1 – Szily, Jozsef – 1/2-1/2 – Honfi, Gyorgy – G48 1. e4 c5 2. Nf3 a6 3. g3 Nc6 4. d4 cxd4 5. Nxd4 Nf6 6. Bg2 e5 7. Nb3 b5 8. Nc3 Bb4 9. O-O d6 10. Nd5 Nxd5
1951 Reggio Emilia – Round 2 – Czerniak, Moshe – 1-0 – Millini, Paolo – G24 1. e4 c5 2. Nf3 a6 3. b4 d6 4. Bc4 e6 5. bxc5 dxc5 6. a4 Nf6 7. Nc3 Nc6 8. O-O Be7 9. Re1 Qc7 10. Bb2 Bd6
1957 DDR Ch U18 – Round 13 – Hoppensack, Manfred – 1-0 – Neukirch, Detlef – G23 1. e4 c5 2. Nf3 a6 3. a4 Nc6 4. d4 cxd4 5. Nxd4 Nf6 6. Nc3 e5 7. Nf5 d5 8. exd5 Bxf5 9. dxc6 bxc6 10. Bd3 Bg4
1957 Leningrad Ch – Round 3 – Krogius, Nikolai V – 0-1 – Spassky, Boris V. – G22 1. e4 c5 2. Nf3 a6 3. g3 g6 4. Bg2 Bg7 5. O-O Nc6 6. c3 e5 7. d3 d6 8. Na3 Nge7 9. Be3 O-O 10. d4 exd4
1957 URS Ch sf – Round 1 – Giterman, Shlomo – 1-0 – Mnatsakanian, Eduard A – G7 1. e4 c5 2. Nf3 a6 3. d3 e6 4. g3 d5 5. Nbd2 Nc6 6. Bg2 Nge7 7. O-O Ng6 8. exd5 exd5 9. d4 cxd4 10. Nb3 Be7
1958 Munich olm fin-B – Round 4 – Czerniak, Moshe – 1/2-1/2 – Raizman, Maurice – G34 1. e4 c5 2. Nf3 a6 3. g3 g6 4. Bg2 Bg7 5. O-O Nc6 6. d3 Nf6 7. Nc3 O-O 8. Be3 d6 9. h3 h6 10. Qd2 Kh7
1958 Munich olm prel – Round 4 – Tringov, Georgi P – 1-0 – Prins, Lodewijk – G94 1. e4 c5 2. Nf3 a6 3. d3 Nf6 4. g3 d5 5. Nbd2 Nc6 6. Bg2 Bg4 7. h3 Bh5 8. O-O e6 9. Re1 dxe4 10. dxe4 Qc7
1959 Corr Wch3 – Round 1 – Balogh, Janos – 1/2-1/2 – Dubinin, Peter – G6 1. e4 c5 2. Nf3 a6 3. Be2 Nc6 4. c3 Nf6 5. e5 Nd5 6. d4 cxd4 7. cxd4 d6 8. Nc3 Nxc3 9. bxc3 e6 10. O-O dxe5
1959 HUN Ch 15th – Round 14 – Dely, Peter – 1/2-1/2 – Honfi, Karoly – G49 1. e4 c5 2. Nf3 a6 3. d3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O d6 7. Nc3 Nf6 8. Nh4 O-O 9. f4 h6 10. f5 g5
1959 Kiel – Round 7 – Richter, Erik – 0-1 – Enevoldsen, Jens – G13 1. e4 c5 2. Nf3 a6 3. b4 cxb4 4. a3 bxa3 5. Nxa3 e6 6. Bb2 d5 7. e5 Bd7 8. d4 Nc6 9. Bd3 Nb4 10. Be2 Ne7
1960 Asuncion – Round 1 – Rivarola, Benigno – 0-1 – Letelier Martner, Rene – G18 1. e4 c5 2. Nf3 a6 3. g3 Nc6 4. Bg2 g6 5. O-O Bg7 6. c3 e6 7. d3 d5 8. Nbd2 Nge7 9. a4 O-O 10. Qc2 b6
1961 Baku ch-URS – Round 5 – Savon, Vladimir – 1-0 – Taimanov, Mark E – G50 1. e4 c5 2. Nf3 a6 3. d3 g6 4. g3 Bg7 5. Bg2 e5 6. h4 d6 7. h5 Bg4 8. h6 Bf6 9. Nbd2 Ne7 10. Nc4 O-O
1961 Budapest – Round 1 – Aczel Szabo, Janos – 1/2-1/2 – Korchnoi, Viktor – G6 1. e4 c5 2. Nf3 a6 3. d3 Nc6 4. g3 Nf6 5. Bg2 e6 6. O-O d5 7. Nbd2 Be7 8. Re1 b5 9. e5 Nd7 10. Nf1 Qc7
1961 Kiev (Ukraine) – Round 4 – Shianovsky, Vladislav I – 0-1 – Kots, Yuri I – G6 1. e4 c5 2. Nf3 a6 3. d3 g6 4. g3 Bg7 5. Bg2 Nc6 6. O-O d6 7. Nbd2 e5 8. c3 Nge7 9. Nc4 Rb8 10. a4 O-O
1961 New York ch-USA – Round 9 – Benko, Pal – 1/2-1/2 – Hearst, Eliot – G44 1. e4 c5 2. Nf3 a6 3. g3 g6 4. Bg2 Bg7 5. O-O Nc6 6. c3 e5 7. Na3 Nge7 8. Nc4 O-O 9. Nd6 Qc7 10. Nxc8 Raxc8
1961 Oberhausen etc – Round 1 – Llado Lumbera, Jaime – 1/2-1/2 – Taimanov, Mark E – G30 1. e4 c5 2. Nf3 a6 3. d3 Nc6 4. Be2 g6 5. O-O Bg7 6. c3 Nf6 7. Be3 d6 8. h3 O-O 9. Nbd2 e5 10. a4 Nh5
1961 URS-ch28 – Round ? – Khasin, Abram – 0-1 – Taimanov, Mark E – G26 1. e4 c5 2. Nf3 a6 3. d3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O d6 7. Re1 e5 8. c3 Nge7 9. Bg5 O-O 10. Qd2 f5
1962 Ch - CC – Round ? – Allen, Leighton – 0-1 – Blackstone, John – G4 1. e4 c5 2. Nf3 a6 3. d3 Nc6 4. g3 d6 5. c3 Nf6 6. Bg2 e5 7. O-O g6 8. Nbd2 Bg7 9. a4 O-O 10. Rb1 Ne8
1963 Fortaleza zt – Round 12 – Garcia Rodriguez, Raimundo – 1-0 – Klein, Juan Carlos – G64 1. e4 c5 2. Nf3 a6 3. g3 Nc6 4. Bg2 Nf6 5. d3 d5 6. Nbd2 e6 7. O-O Be7 8. Re1 O-O 9. e5 Nd7 10. Nf1 Qc7
1963 Halle zt – Round 1 – Kinnmark, Ove – 0-1 – Hamann, Slawomir – G63 1. e4 c5 2. Nf3 a6 3. b4 cxb4 4. a3 e6 5. d4 d5 6. e5 bxa3 7. Bd3 f5 8. Nxa3 Bb4+ 9. Kf1 Ne7 10. Nb5 O-O
1963 Sao Paulo – Round 6 – Engels, Ludwig – 1/2-1/2 – Fonrobert, Gert Wolfgang – G11 1. e4 c5 2. Nf3 a6 3. b4 d5 4. exd5 Qxd5 5. c4 Qe6+ 6. Be2 Qf6 7. bxc5 Qxa1 8. Nc3 e5 9. O-O Bxc5 10. Ne1 Bd4
1966 La Habana olm prel – Round 4 – Chiaramonti, Jacques – 1/2-1/2 – Schweber, Samuel – G142 1. e4 c5 2. Nf3 a6 3. b3 d6 4. Be2 Nf6 5. d3 g6 6. Bb2 Bg7 7. Nbd2 O-O 8. O-O e5 9. c3 Nc6 10. d4 exd4
1966 Oberhausen ol women – Round 9 – Polihroniade, Elisabeta – 0-1 – Gresser, Gisela Kahn – G44 1. e4 c5 2. Nf3 a6 3. d3 g6 4. g3 Bg7 5. Bg2 d6 6. O-O e5 7. c3 Ne7 8. Be3 Nbc6 9. Qd2 O-O 10. d4 b6
1966 Sunderland ch-BCF – Round 10 – Hindle, Owen M – 1/2-1/2 – Borwell, Alan P – G87 1. e4 c5 2. Nf3 a6 3. d3 g6 4. g3 Bg7 5. Bg2 Nc6 6. O-O d6 7. c3 e5 8. Nbd2 Bg4 9. Nc4 Nge7 10. h3 Be6
1967 It II – Round 11 – Van Wijngaarden, Fedde – 1/2-1/2 – Szily, Jozsef – G23 1. e4 c5 2. Nf3 a6 3. d3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O d6 7. c3 b5 8. d4 cxd4 9. Nxd4 Nxd4 10. cxd4 Bb7
1967 URS Team Ch – Round 1 – Gaprindashvili, Nona – 1/2-1/2 – Zatulovskaya, Tatiana – G69 1. e4 c5 2. Nf3 a6 3. g3 Nc6 4. Bg2 Nf6 5. d3 d6 6. O-O g6 7. Nbd2 Bg7 8. a4 O-O 9. c3 Bg4 10. h3 Bd7
1969 Monte Carlo-B – Round 7 – Mazzoni, Guy – 0-1 – Gerusel, Mathias – G31 1. e4 c5 2. Nf3 a6 3. d3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O d6 7. Nc3 Bd7 8. a3 e6 9. Rb1 Nge7 10. Nh4 O-O
CCT Final KO 2023 – Round 2.13 – So, Wesley – 0-1 – Carlsen, Magnus – G24 1. e4 c5 2. Nf3 a6 3. Be2 d6 4. d4 cxd4 5. Qxd4 Nc6 6. Qd3 g6 7. O-O Bg7 8. Nc3 Nf6 9. Nd5 O-O 10. c3 b5
FIDE World Rapid Championship 2025 – Round 4 – Javokhir Sindarov – 1-0 – Nikolas Theodorou – G68 1. e4 c5 2. Nf3 a6 3. g3 Nc6 4. Bg2 e5 5. O-O g6 6. a3 Bg7 7. b4 d6 8. bxc5 dxc5 9. Nc3 Nge7 10. d3 O-O
USA Ch 2017 – Round 1.6 – Zherebukh, Yaroslav – 1/2-1/2 – Kamsky, Gata – G6 1. e4 c5 2. Nf3 a6 3. Be2 e6 4. O-O b5 5. a4 b4 6. c3 Bb7 7. cxb4 cxb4 8. d3 Nf6 9. Be3 Nc6 10. Nbd2 Be7
USA Ch 2022 – Round 5.5 – Shankland, Sam – 1-0 – Moradiabadi, Elshan – G32 1. e4 c5 2. Nf3 a6 3. g3 Nc6 4. Bg2 g6 5. O-O Bg7 6. Re1 e5 7. Nc3 Nge7 8. a3 d6 9. Rb1 O-O 10. b4 b5
World Blitz 2016 – Round 21.21 – Vitiugov, Nikita – 1-0 – Pantsulaia, Levan – G825 1. e4 c5 2. Nf3 a6 3. b3 d6 4. Bb2 Nf6 5. e5 dxe5 6. Nxe5 e6 7. g3 Qd5 8. Qf3 Nbd7 9. Bg2 Nxe5 10. Qxd5 Nxd5
World Blitz 2019 – Round 20.34 – Amin, Bassem – 1-0 – Drygalov, Sergey – G1351 1. e4 c5 2. Nf3 a6 3. g3 b5 4. Bg2 Bb7 5. d3 e6 6. O-O d6 7. Re1 Nf6 8. a4 Be7 9. Na3 O-O 10. Bf4 e5
World Blitz 2019 – Round 4.54 – Zvjaginsev, Vadim – 1/2-1/2 – Kazakouski, Valery – G278 1. e4 c5 2. Nf3 a6 3. Be2 b5 4. a4 Bb7 5. axb5 axb5 6. Rxa8 Bxa8 7. d3 e6 8. O-O d6 9. d4 Qb6 10. d5 exd5
World Blitz 2021 – Round 2.17 – Onyshchuk, Volodymyr – 0-1 – Van Foreest, Lucas – G77 1. e4 c5 2. Nf3 a6 3. b3 Nc6 4. Bb2 d6 5. g3 e5 6. Bg2 g6 7. O-O Bg7 8. h3 Nge7 9. c3 O-O 10. d4 exd4
World Blitz 2021 – Round 7.70 – Bartel, Mateusz – 0-1 – Kozak, Adam – G441 1. e4 c5 2. Nf3 a6 3. g3 b5 4. Bg2 Bb7 5. d3 g6 6. O-O Bg7 7. Nc3 d6 8. a4 b4 9. Nd5 Nf6 10. Nxf6+ Bxf6

Fin du contenu

Aucune page supplémentaire à charger

Articles plus anciens →