C81b — Spanish: Open, Keres Attack, 9…Bc5

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2 Bc5 * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plan principal. Attaque sur le roi adverse resté au centre.

Atouts. Les Blancs s'appuient sur la paire de fous et la colonne semi-ouverte d.

Côté adverse. Le roi resté au centre.

En contrepartie. Plusieurs pièces dorment encore (le cavalier b1, le fou c1 et la tour a1).

Plans. Nbd2 (Développer Nb1) ; Be3 (Développer Bc1) ; h3 (Empêcher ...Bg4).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plan principal. Exploiter la case forte b4….

Atouts. Les Noirs s'appuient sur les cases fortes b4 et d4, des fous actifs en c5 et e6, la paire de fous et la colonne semi-ouverte e.

Côté adverse. Le fou enfermé en c1.

En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (les tours a8 et h8).

Plans. O-O (Mettre le roi en sécurité, connecter les tours) ; ...Bg4 (Clouer Nf3) ; ...d4 (Rupture) ; ...f6 (Rupture) ; ...f5 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● a6→b5
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	● b4 (2v0), ● d4 (2v1)
Cases faibles	● f2, ● c4	● g5
Centre	—	● d4 (2v1), ● d5 (2v1)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● d	● e

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bb3	● Bb3 Ok (mob. 3)
Bc5		● Bc5 Actif (mob. 10)
Be6		● Be6 Actif (mob. 5)
Paire de fous	● Oui	● Oui
Clouages	● pawn f2	—
Non développées	3 (● b1, ● c1, ● a1)	2 (● 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	semi-ouvert
Ruptures	● c2-c3	● …d5-d4, ● …f7-f6, ● …f7-f5

Partie
1947 Weidenau – Round 1 – Sahlmann, Walter – 0-1 – Roedl, Ludwig – G13 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1948 Buenos Aires/La Plata it – Round 1 – Pilnik, Herman – 1-0 – Garcia Balado L – G23 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 10. ... O-O
1950 Dubrovnik olm – Round 11 – Flores Alvarez, Rodrigo – 1-0 – Sumar, Julio – G162 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1950 Dubrovnik olm – Round 14 – Skold, Kent-Ake – 1/2-1/2 – Poulsen, Christian – G217 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1950 URS Ch sf Gorky – Round 13 – Konstantinov, Alexandr – 1/2-1/2 – Estrin, Yakov – G9 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Bf5
1952 POL-ch10 – Round 5 – Grynfeld, Izaak – 1/2-1/2 – Sliwa, Bogdan – G38 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1955 Novi Sad – Round 9 – Karaklajic, Nikola – 1-0 – Puc, Stojan – G77 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Qe7
1956 CAN-op – Round 9 – Yanofsky, Daniel Abraham – 1/2-1/2 – Anderson, Frank Ross – G7 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1957 CSR Ch – Round 13 – Kozma, Julius – 1-0 – Eret, Miloslav – G54 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Ne7
1958 Corr – Round 1 – Niephaus, Walter – 1-0 – Farber, Eoghan – G11 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1958 Sarajevo ch YUG – Round 2 – Sokolov, Vladimir – 1-0 – Karaklajic, Nikolas – G3 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1961 Zagreb – Round 4 – Puc, Stojan – 1-0 – Cuderman, Vinko – G49 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Qe7
1962 CSR Ch – Round 15 – Jansa, Vlastimil – 1-0 – Augustin, Josef – G131 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1962 URS Team Ch – Round ? – Dubinsky, Alexander – 1/2-1/2 – Tukmakov, Vladimir B – G160 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1962 Whitby ch-BCF – Round 10 – Concepcion Smith, David Andrew – 0-1 – Mardle, Denis – G104 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1964 Chigorin Memorial – Round 8 – Matulovic, Milan – 1-0 – Lein, Anatoly – G53 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1964 Pecs – Round 14 – Dely, Peter – 1/2-1/2 – Honfi, Karoly – G87 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1964 Tel Aviv olm – Round 1 – Acosta Garcia, Rafael Isaac – 1-0 – Anderson, F. – G100 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1964 Tel Aviv olm fin-A – Round 4 – Garcia Rodriguez, Raimundo – 1-0 – Andersen, Borge – G80 1. e4 Nc6 2. Nf3 e5 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1965 Hamburg etc – Round 1 – Parma, Bruno – 1/2-1/2 – Barcza, Gedeon – G37 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1965 Hamburg etc – Round 7 – Huebner, Robert – 1-0 – Honfi, K. – G89 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1965 Hastings ch-BCF – Round 1 – Mardle, Denis – 1-0 – Toothill, Andrew – G17 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Bxe3
1965 HUN Ch 20th – Round ? – Kovacs, Laszlo M – 0-1 – Honfi, Karoly – G16 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1965 HUN Ch 21th – Round ? – Foldi, Jozsef – 1/2-1/2 – Honfi, Karoly – G17 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1965 HUN-ch21 – Round 1 – Kovacs, Laszlo M – 1/2-1/2 – Haag, Ervin – G53 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. a4 Rb8
1965 Hungary – Round 1 – Polgar, Istvan – 0-1 – Honfi, K. – G85 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1965 Zinnowitz 02nd – Round 5 – Dely, Peter – 1/2-1/2 – Haag, Ervin – G13 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
1966 CSR Ch Int 1st – Round 9 – Augustin, Josef – 1/2-1/2 – Kovacs, Laszlo M – G48 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1966 La Habana olm prel – Round 2 – Matulovic, Milan – 1-0 – Tsagan, T – G69 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Ne7
1966 Sarajevo – Round 3 – Janosevic, Dragoljub – 1-0 – Honfi, Karoly – G11 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1966 Sarajevo – Round 5 – Bogdanovic, Radivoje – 1/2-1/2 – Honfi, K. – G16 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1966 Sarajevo Sarajevo BIH – Round 1 – Jansa, Vlastimil – 1/2-1/2 – Honfi, K. – G6 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1967 Moscow – Round ? – Gipslis, Aivars – 1/2-1/2 – Keres, Paul Petrovich – G164 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Qe7
1967 Sochi – Round 13 – Bogdanovic, Rajko – 0-1 – Zhukhovitsky, Samuel – G105 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Qe7
1968 Lugano olm - Round 1 - Glauser, Hansruediger - 1/2-1/2 - Venalainen, Unto E. - G289 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
1969 Mar del Plata zt – Round 1 – Aceros Rodriguez, Oscar Leonardo – 1/2-1/2 – Rossetto, Hector – G34 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Qe7
1969 Villa Gesell tt – Round 4 – Emma, Jaime – 0-1 – Rossetto, Hector – G21 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Qe7
1969 Wch jr final A – Round 4 – McKay, Roderick M – 1-0 – Kaplan, Julio – G10 1. e4 Nc6 2. Nf3 e5 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 Qe7
Brussels 1987 – Round 1 – Tal, Mikhail – 1/2-1/2 – Korchnoi, Viktor – G27 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Be3 O-O
Corsican Circuit Final 2016 – Round 1.1 – Gharamian, Tigran – 1-0 – Vocaturo, Daniele – G5 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2
Linares 1981 – Round 1 – Ljubojevic, Ljubomir – 1/2-1/2 – Larsen, Bent – G8 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Bc5 10. Nbd2 Nxd2

C81b — Open Keres Attack

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2 Bc5

Eval: [+0.55]

Les coups candidats

10.Be3 — 70.0% (266 parties)

Ambassadeurs : Grivas, Efstratios (5x), Lombart, Philippe (5x), Honfi, Karoly (4x), Matulovic, Milan (4x), Antoshin, Vladimir S (4x), Georgiev, Krum (4x), ? (4x), Rossetto, Hector (3x)

10.Nbd2 — 23.7% (90 parties)

Ambassadeurs : Estrin, Yakov (3x), Grivas, Efstratios (3x), Honfi, K. (2x), Jansa, Vlastimil (2x), Augustin, Josef (2x), Sumar, Julio (2x), Sobeck, Guenter (2x), Lombart, Philippe (2x)

10.c3 — 4.2% (16 parties)

Ambassadeurs : Georgescu, Vasile Sr (1x), Troianescu, Octav (1x), Draxl, Rudolph (1x), Anderson, Frank Ross (1x), Karim Firrat (1x), Zapata Jaya, Wilson Daniel (1x), Maus, Siegfried (1x), Pieper-Emden, Carsten (1x)

10.a4 — 1.1% (4 parties)

Ambassadeurs : Ousatchi, Mark (1x), Shianovsky, Vladislav I (1x), Nilsson, Zandor (1x), Hult, Bjorn (1x), Kovacs, Laszlo M (1x), Haag, Ervin (1x), Cygan, Tomasz (1x), Kozdryk, Andrzej (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	10.Be3	10.Nbd2	10.c3	10.a4
<1800	9	56%	33%	11%	—
1800-2200	87	64%	32%	3%	—
2200-2600	129	75%	20%	3%	—
2600+	5	60%	40%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	10.Be3	10.Nbd2	10.c3	10.a4
1940s	5	80%	20%	—	—
1950s	25	52%	40%	4%	4%
1960s	46	74%	20%	2%	4%
1970s	37	70%	22%	8%	—
1980s	37	73%	19%	5%	—
1990s	74	78%	15%	4%	1%
2000s	64	73%	17%	8%	—
2010s	66	62%	35%	2%	—
2020s	26	62%	38%	—	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
10.Be3	62%	62%	▼ -0.6%
10.Nbd2	35%	38%	▲ +3.6%
10.c3	2%	0%	▼ -1.5%
10.a4	0%	0%	+0.0%

Joueurs célèbres

Champions du monde dans cette position

Smyslov, Vladimir — 1 partie

Parties historiques

10.Be3 — 70.0% (266 parties)

1948 — Pilnik, Herman vs Garcia Balado L — 1-0 — Buenos Aires/La Plata
1949 — Aitken, James vs Durham, Daniel — 1-0 — London ENG
1949 — Znosko-Borovsky, Eugene vs Unzicker, Wolfgang — 0-1 — Lucerne SUI
1949 — Ivkov, Borislav vs Fuderer, Andrija — 0-1 — Yugoslavia
1950 — Mertins, Klaus vs Bachl, Alois — 0-1 — Northeim

10.Nbd2 — 23.7% (90 parties)

1947 — Sahlmann, Walter vs Roedl, Ludwig — 0-1 — Weidenau
1950 — Konstantinov, Alexander Ivanovich vs Estrin, Yakov — 1/2-1/2 — Gorky
1950 — Konstantinov, Alexandr vs Estrin, Yakov — 1/2-1/2 — URS-ch sf Gorky
1950 — Flores Alvarez, Rodrigo vs Sumar, Julio — 1-0 — Dubrovnik CRO
1950 — Aguilar Flores, Renata Camila vs Sumar, Julio — 1-0 — Dubrovnik olm

10.c3 — 4.2% (16 parties)

1955 — Draxl, Rudolph vs Anderson, Frank Ross — 1-0 — Toronto CAN
1967 — Georgescu, Vasile Sr vs Troianescu, Octav — 0-1 — Bucharest ROU
1973 — Nepomuceno Moreno, Emilio vs Casacobos — 1-0 — ESP
1976 — Karim Firrat vs Zapata Jaya, Wilson Daniel — 0-1 — Caracas VEN
1976 — Bade, Heidrun vs Winter, Irene — 1/2-1/2 — Groeditz

10.a4 — 1.1% (4 parties)

1953 — Nilsson, Zandor vs Hult, Bjorn — 1-0 — Oerebro
1960 — Ousatchi, Mark vs Shianovsky, Vladislav I — 1/2-1/2 — ?
1965 — Kovacs, Laszlo M vs Haag, Ervin — 1/2-1/2 — Budapest HUN
1991 — Cygan, Tomasz vs Kozdryk, Andrzej — 1/2-1/2 — Pyskovice

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