Structure de pions

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

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	● b4 (2v0), ● c5 (2v0)
Cases faibles	● c4	● g5
Centre	—	● 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)
Be6		● Be6 Actif (mob. 5)
Bf8		● Bf8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	3 (● b1, ● c1, ● a1)	3 (● f8, ● 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	mobile
Ruptures	● c2-c4	● …f7-f6

C81a — Spanish: 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 * ● Trait aux Noirs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plans. Rd1 (Tour sur colonne semi-ouverte d — 78 % des parties) ; Be3 (Fou actif (mobilité 9), Développer c1 — 10 % des parties) ; Nbd2 (Développer b1 — 5 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plans. ...Be7 (Fou actif (mobilité 8), Développer f8 — 68 % des parties) ; ...Bc5 (Clouer f2, Fou actif (mobilité 10), Développer f8 — 15 % des parties) ; ...Nc5 (Cavalier actif en c5 — 13 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Partie
1940 Krakow – Round 1 – Kohler Rosa, Tony Denis – 1-0 – Gilg, Karl – G2 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 Na5 10. Nbd2 Nxd2
1946 Staunton, Groningen NED – Round 1 – Stoltz, Gosta – 0-1 – Szabo, Ladislav – 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 Bd6 10. Nbd2 Nc5
1947 Leningrad ch-URS – Round 14 – Keres, Paul – 1-0 – Alatortsev, Vladimir N. – G133 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 Nc5 10. Rd1 Nxb3
1948 GBR Ch 35th – Round 1 – Alexander, Conol Hugh – 1-0 – Abrahams, Gerald – G4 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 Na5 10. Nd4 Bc5
1948 GBR Ch 35th – Round 3 – Thomas, George Alan – 1-0 – Abrahams, Gerald – G10 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 Na5 10. Rd1 Be7
1948 Hastings4849 – Round 2 – Bellod Thomas, Gonzalo – 1/2-1/2 – Wade, Robert G – 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 g5 10. c4 g4
1948 Saltsjobaden Interzonal – Round 12 – Boleslavsky, Isaac – 1-0 – Stoltz, Gabriel – G113 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 g5 10. c4 bxc4
1948 Saltsjobaden tt – Round 1 – Skold, Kristian – 1/2-1/2 – Kongshavn, Harry – 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 Na5 10. Nd4 Nxb3
1948 Venice – Round 1 – Lokvenc, Josef – 1/2-1/2 – Euwe, Max – G66 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 Nc5 10. Rd1 Nxb3
1948 World Championship 18th – Round 19 – Smyslov, Vladimir – 1-0 – Euwe, Max – 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 Nc5 10. Rd1 Nxb3
1948 World Championship 18th – Round 21 – Smyslov, Vladimir – 1/2-1/2 – Reshevsky, Samuel – 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 Nc5 10. Rd1 b4
1949 CAN Ch Arvida – Round 8 – Fox, Maurice – 1/2-1/2 – Andersen, Borge – 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 Nc5 10. Rd1 Be7
1949 Gambit CC Ch – Round 3 – Greenberg, Joe – 0-1 – Anderson, Frank Ross – 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 Nc5 10. Rd1 Be7
1950 Corr – Round 1 – Barda, Olaf – 1/2-1/2 – Malmgren, Adrian – G18 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 Nc5 10. Rd1 Nxb3
1950 Venice – Round 12 – Smyslov, Vladimir – 1-0 – Abadia Castillo, Mateo – 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 Nc5 10. Rd1 b4
1951 BRA Ch – Round 8 – Lemos, Jorge Joao – 0-1 – German, Eugenio – 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 Nc5 10. Rd1 Be7
1951 Bucharest GMT 2nd – Round 6 – Pietzsch, Wolfgang – 1/2-1/2 – Urseanu, Veniamin – G26 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 Nc5 10. Rd1 Be7
1951 Toronto Ch finals – Round 9 – Siemms, Ross E – 0-1 – Anderson, Frank Ross – G14 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 Nc5 10. Rd1 Be7
1951 Vancouver – Round 1 – Bohatyrchuk, Fedir Parfenovych – 0-1 – Divinsky, Nathan – G19 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 Na5 10. Nbd2 Nxd2
1951 Vancouver – Round 1 – Yanofsky, Daniel Abraham – 0-1 – Andersen, Borge – G18 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 Nc5 10. Rd1 Be7
1952 Belgrade – Round 15 – Bogdanovic, Rajko – 0-1 – Fuderer, Andrija – 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 Nc5 10. Rd1 Be7
1952 JUG Ch – Round 15 – Djurasevic, Bozidar – 1/2-1/2 – Trifunovic, Petar – G96 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 Nc5 10. Rd1 Nxb3
1952 Liverpool – Round 4 – Bronstein, David I – 1-0 – Katragadda, G. – 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 Nc5 10. Rd1 Nxb3
1952 Mar del Plata – Round 13 – Budowski, Gerardo – 0-1 – German, Eugenio – G96 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 Nc5 10. Rd1 Be7
1952 Saltsjobaden Interzonal – Round 18 – Pilnik, Herman – 1-0 – Unzicker, Wolfgang – G171 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 Nc5 10. Rd1 Be7
1954 Mar del Plata – Round 15 – Benko, Francisco – 0-1 – Estrada Degrandi, Walter – G116 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 Na5 10. Rd1 c6
1955 Ljubljana – Round 6 – Karaklajic, Nikola – 1/2-1/2 – Krivec Slavko – G51 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 Nc5 10. Rd1 Be7
1956 Denmark ch corr – Round ? – Stoltze, Kurt – 1/2-1/2 – From, Sigfred – 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 Nc5 10. Rd1 Be7
1956 URS Ch, semi final – Round 17 – Kotkov, Yuri – 1-0 – Gurgenidze, Bukhuti – G114 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 Nc5 10. Rd1 Be7
1957 CSR Ch – Round 4 – Pachman, Ludek – 1-0 – Koska, Josef – 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 Na5 10. Nd4 Qd7
1957 Danmarksmesterskabet – Round 4 – Pedersen, Eigil – 1-0 – Norman Hansen, Holger – 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 Na5 10. Nd4 Qh4
1957 Reykjavik – Round 4 – Johannsson, Ingi R – 1/2-1/2 – Pilnik, Herman – G31 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 Nc5 10. Rd1 b4
1957 Sombor – Round 12 – Milic, Borislav – 1/2-1/2 – Karaklajic, Nikola – G121 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 Nc5 10. Bg5 Be7
1958 Buenos Aires V – Round 1 – Rossetto, Hector – 1-0 – Estrada Degrandi, Walter – 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 Nc5 10. Rd1 Be7
1958 Mar del Plata – Round 12 – Panno, Oscar – 1/2-1/2 – Sumar, Julio – G90 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 Nc5 10. Rd1 Nxb3
1959 Berlin Ch – Round 6 – Darga, Klaus – 1-0 – Lohsse, Hans Peter – G14 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 Nc5 10. Rd1 Be7
1959 Buenos Aires Ch – Round 11 – Bartis, Gustavo – 0-1 – Piazzini, Luis – G46 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 Na5 10. Nbd2 Nxd2
1959 CSR Ch – Round 12 – Blatny, Frantisek – 1-0 – Augustin, Josef – G96 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 Nc5 10. Rd1 Nxb3
1959 Zuerich – Round 1 – Nievergelt, Erwin – 1/2-1/2 – Bhend, Edwin – G57 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 Na5 10. Rd1 Be7
1961 Moscow Ch – Round ? – Ignatiev, Felix N – 1/2-1/2 – Khasin, Abram – G103 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 Nc5 10. Rd1 Be7
1961 URU Ch sf – Round ? – Kaszdan Ernesto – 0-1 – Estrada Degrandi, Walter – 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 Na5 10. Nd4 Bc5
1962 Erevan ch-URS – Round 1 – Novopashin, Arkady – 1-0 – Zaitsev, Alexander – G128 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 Nc5 10. Rd1 Be7
1962 Hastings II – Round 2 – Brinck-Claussen, Bjorn – 1/2-1/2 – Aabel Thomas Eapen – G4 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 Nc5 10. Rd1 Nxb3
1962 Varna olm – Round 8 – Cobo Arteaga, Eldis – 1-0 – Capilla Murphy, Serena – G372 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 Na5 10. Nd4 Nxb3
1964 Pecs – Round 7 – Gipslis, Aivars – 1-0 – Haag, Ervin – G42 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 Nc5 10. Rd1 Nxb3
1964 Tel Aviv olm – Round 1 – Kuijpers, Frans – 1-0 – Myagmarsuren, Lkhamsuren – G102 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 Nc5 10. Rd1 Nxb3
1964 Tel Aviv olm prel – Round 3 – Cuijpers, Frans Andre – 1-0 – Myagmarsuren, Lkhamsuren – G28 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 Nc5 10. Rd1 Nxb3
1964 WchT U26 11. fin-A – Round 11.3 – Jansa, Vlastimil – 1-0 – Zorigt, Damdzinhav – G199 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 Nc5 10. Rd1 Nxb3
1964 WchT U26 11. fin-A – Round 9.3 – Seuss, Oswald – 0-1 – Ujtumen, Tudev – G159 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 Nc5 10. Rd1 Nxb3
1965 Capablanca Memorial – Round 13 – Ivkov, Borislav – 1-0 – Donner, Jan-Hein – G135 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 Nc5 10. Rd1 Nxb3
1965 Chigorin Memorial – Round 13 – Jansa, Vlastimil – 1-0 – Ujtumen, Tudev – G64 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 Nc5 10. Rd1 Nxb3
1965 Mar del Plata – Round 11 – Sanguinetti, Ricardo – 1-0 – Palermo, Vicente – 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 Nc5 10. Rd1 Nxb3
1965 Marianske Lazne – Round 6 – Hort, Vlastimil – 1/2-1/2 – Pachman, Ludek – G30 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 Nc5 10. Rd1 Be7
1967 Maribor – Round 8 – Matulovic, Milan – 1/2-1/2 – Unzicker, Wolfgang – 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 Nc5 10. Rd1 Be7
1969 San Juan – Round 13 – Kavalek, Lubomir – 0-1 – Kaplan, Julio – G89 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 a6 6. Ba4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Nc5 10. Rd1 Nxb3
1969 Zalaegerszeg – Round 1 – Nikolic, Stanimir – 1-0 – Gesos, Pavlos – 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 Nc5 10. Rd1 Na5
1970 Palma de Mallorca Interzonal – Round 2 – Matulovic, Milan – 0-1 – Ujtumen, Tudev – G209 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 Nc5 10. Rd1 Nxb3
4. Sinquefield Cup 2016 – Round 9.5 – Caruana, Fabiano – 1-0 – Giri, Anish – G45 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 Nc5 10. Rd1 Nxb3
42. Olympiad 2016 – Round 6.7 – Perez Ponsa, Federico – 0-1 – Ding, Liren – G455 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 Nc5 10. Rd1 Nxb3
43. Olympiad 2018 – Round 7.9 – Bellahcene, Bilel – 1/2-1/2 – Anton Guijarro, David – G493 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 Nc5 10. Rd1 Nxb3
GCT Rapid Paris 2017 – Round 5.4 – Caruana, Fabiano – 0-1 – Mamedyarov, Shakhriyar – G24 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 Nc5 10. Nc3 Nxb3

C81a — Open, Howell Attack (1940)

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

Les coups candidats

9…Be7 — 68.5% (1789 parties) →

Ambassadeurs : Matulovic, Milan (16x), Jansa, Vlastimil (16x), Timman, Jan H (13x), ? (10x), Korchnoi, Viktor (9x), Donner, Jan-Hein (8x), Kavalek, Lubomir (8x), Buj, Pablo (8x)

9…Bc5 — 14.6% (382 parties) →

Ambassadeurs : Honfi, Karoly (10x), Grivas, Efstratios (10x), Lombart, Philippe (7x), Anderson, Frank Ross (5x), ? (5x), Simacek, Pavel (5x), Sobeck, Guenter (4x), Abanin, Vladimir (4x)

9…Nc5 — 12.7% (332 parties)

Ambassadeurs : Ujtumen, Tudev (9x), Anderson, Frank Ross (8x), German, Eugenio (4x), Myagmarsuren, Lkhamsuren (4x), Palermo, Vicente (4x), Girya, Olga (4x), Siemms, Ross E (3x), Jansa, Vlastimil (3x)

9…Na5 — 3.4% (89 parties)

Ambassadeurs : Bohatyrchuk, Fedir Parfenovych (2x), Neubert, Gerhard (2x), Janik, Stanislav (2x), Kampman, Tijmen (1x), Illgen, Hans (1x), Mazzoni, Guido (1x), Gardais Philippe (1x), Hammar, Bengt (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	9…Be7	9…Bc5	9…Nc5	9…Na5
<1800	80	62%	20%	10%	8%
1800-2200	610	67%	18%	10%	4%
2200-2600	848	71%	15%	12%	1%
2600+	72	71%	6%	24%	—

Évolution par décennie (% des parties)

Décennie	N parties	9…Be7	9…Bc5	9…Nc5	9…Na5
1950s	186	44%	13%	32%	10%
1960s	253	61%	18%	17%	4%
1970s	375	75%	10%	10%	4%
1980s	355	81%	10%	6%	2%
1990s	403	74%	19%	4%	3%
2000s	307	69%	21%	7%	3%
2010s	411	65%	16%	14%	4%
2020s	320	64%	10%	24%	1%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
9…Be7	65%	64%	▼ -1.1%
9…Bc5	16%	10%	▼ -5.7%
9…Nc5	14%	24%	▲ +10.7%
9…Na5	4%	1%	▼ -2.7%

Joueurs célèbres

Champions du monde dans cette position

Tal, Mikhail — 8 parties
Carlsen, Magnus — 4 parties
Karpov, Anatoly — 2 parties
Kasparov, Garry — 1 partie
Kramnik, Vladimir — 1 partie
Anand, Viswanathan — 1 partie
Ding, Liren — 1 partie
Gukesh D — 1 partie

Parties historiques

9…Be7 — 68.5% (1789 parties)

1950 — Malmgren, Harald vs Cuadrado Orlando — 1-0 — cr.
1950 — Neatby, Leslie Hamilton vs Anderson, Frank Ross — 0-1 — Toronto CAN
1950 — Mross, Paul vs Eken, Max — 0-1 — ?
1950 — Franklin Kagoni vs Ragozin, Viacheslav — 0-1 — URS-ch sf Kiev UKR
1950 — Bosch van Rosenthal, Edzard vs Cuadrado Pastor, Antonio — 1/2-1/2 — ?

9…Bc5 — 14.6% (382 parties)

1950 — Skold, Kristian vs Poulsen, Christian — 1/2-1/2 — Dubrovnik olm
1950 — Konstantinov, Alexander vs Estrin, Yakov — 1/2-1/2 — Gorky
1950 — Konstantinov, Alexandr vs Estrin, Yakov — 1/2-1/2 — URS-ch sf Gorky
1950 — Mertins, Klaus vs Bachl, Anton — 0-1 — Northeim
1950 — Weiss, Adam vs Watzl — 0-1 — cr.

9…Nc5 — 12.7% (332 parties)

1950 — Siemms, Ross E vs Anderson, Frank Ross — 0-1 — Toronto CAN
1950 — Smyslov, Vasily vs Castillo Bermudez, Manuel — 1-0 — Venice ITA
1950 — Munch, Anders vs Hrudka, Oleksandr — 0-1 — DDR
1950 — Madsen, Sverre vs Malmgren, Harald — 1/2-1/2 — ICCF
1950 — Madsen, Alexander vs Malmgren, Adrian — 1/2-1/2 — cr.

9…Na5 — 3.4% (89 parties)

1950 — Kampman, Tijmen vs Illgen, Hans — 1/2-1/2 — Bielefeld
1950 — Fontana, Alessandro vs Gabiro Soul — 1-0 — cr.
1950 — Shaffer, Alexander vs Hadolt, Matthias — 1-0 — ?
1950 — Bohatyrchuk, Fedir Parfenovych vs Paterson, Smyth — 0-1 — Toronto CAN
1950 — Sigurdsson, Gudjon vs Vestol, Aage — 1-0 — Reykjavik ISL

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