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

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) ; Bc2 (Anticiper ...Na5) ; Tour sur colonne d.

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

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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