Structure de pions
♔ Blancs ♚ Noirs
Pions doublés — —
Pions isolés — —
Arriérés — —
Chaînes ● f2→e3, e3→d4 ● f7→g6, h7→g6
Passés — —
Majorité — —
Cases
♔ Blancs ♚ Noirs
Cases fortes ● b5 (2v0), ● e5 (3v0), ● g5 (2v0) ● e4 (2v1), ● g4 (2v0), ● f5 (2v0)
Cases faibles — ● d5
Centre ● d4 (3v1), ● e5 (3v0) ● e4 (2v1)
Colonnes et diagonales
♔ Blancs ♚ Noirs
Pièces
♔ Blancs ♚ Noirs
Bf1 ● Bf1 Non développé (mob. 2)
Bf4 ● Bf4 Actif (mob. 7)
Bg7 ● Bg7 Ok (mob. 2)
Bc8 ● Bc8 Non développé (mob. 5)
Paire de fous ● Oui ● Oui
Non développées 3 (● f1, ● a1, ● h1) 3 (● b8, ● c8, ● a8)
Sécurité du roi
♔ Blancs ♚ Noirs
Statut ● Au centre ● Roqué
Droits de roque O-O / O-O-O —
Thèmes
♔ Blancs ♚ Noirs
Phase Ouverture
Centre fermé
Ruptures ● e3-e4 ● …e7-e5

D93b — Gruenfeld

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bf4 O-O 6.e3 c5   ○ Trait aux Blancs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1
bR
bN
bB
bQ
bR
bK
bP
bP
bP
bP
bB
bP
bN
bP
Case forte (2v0)
bPpawn en prise !
bP
Case forte (3v0)
Case forte (2v0)
wP
wPPion central
wBFou actif — mobilité 7
wN
wPPion central
wN
wP
wP
wP
wP
wP
wR
wQ
wK
wB
wR
abcdefgh
Plans. dxc5 (Capture en c5, Frapper le centre adverse — 63 % des parties) ; Be2 (Développer f1 — 17 % des parties) ; Rc1 (6 % des parties) ; Qb3 (Contrôle diagonale b3-g8, Prépare O-O-O — 6 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8
wR
wB
wK
wQ
wR
wP
wP
wP
wP
wP
wN
wP
wN
Case forte (2v0)
wB
Avant-poste C (accessible)
wP
wP
Avant-poste F (accessible)
bP
bPpawn en prise !
bP
bN
bP
bB
bP
bP
bP
bP
bK
bR
bQ
bBFou actif — mobilité 5
bN
bR
hgfedcba
Plans. ...Qa5 (Contrôle diagonale a5-e1 — 51 % des parties) ; ...cxd4 (Capture en d4, Occuper le centre — 17 % des parties) ; ...Ne4 (Cavalier centralisé en e4 — 13 % des parties) ; ...Nc6 (Développer b8 — 10 % des parties).
Avantages
Faiblesses
Diagonale active
Plans
Partie
1923 DSB-23.Kongress – Round 1 – Brinckmann, Alfred – 0-1 – Post, Erhard – G2
1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. Bf4 c5 6. e3 O-O 7. Qb3 cxd4 8. Nxd4 Nc6 9. Nxc6 bxc6 10. Be2 Bf5
1928 Berlin Cafe Koenig – Round 3 – List, Paul – 0-1 – Helling, Karl – G14
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be2 cxd4 8. exd4 Nc6 9. O-O Bg4 10. h3 Bxf3
1933 Trebitsch Memorial 16th – Round 15 – Beutum, Sigmund – 0-1 – Hoenlinger, Baldur – G65
1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. Be2 cxd4 8. exd4 b6 9. O-O Bb7 10. Rc1 Nc6
1936 ARG Team Ch – Round 5 – Emiliani, J. – 0-1 – Iliesco, Juan – G10
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 O-O 6. e3 c5 7. Rc1 cxd4 8. Nxd4 Nc6 9. Nxc6 bxc6 10. cxd5 Nxd5
1936 Munich – Round 1 – Bohosievicz – 1-0 – Roedl, Ludwig – G6
1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. Qb3 cxd4 8. exd4 dxc4 9. Bxc4 Nc6 10. Ne5 Na5
1936 Olympiad (unofficial) – Round 12 – Bohosiewicz, Grzegorz – 1-0 – Roedl, Ludwig – G94
1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. Qb3 cxd4 8. exd4 dxc4 9. Bxc4 Nc6 10. Ne5 Na5
1937 Semmering/Baden – Round 4 – Eliskases, Erich – 0-1 – Flohr, Salo – G15
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. cxd5 Nxd5 8. Be5 Nxc3 9. bxc3 cxd4 10. Bxg7 Kxg7
1938 Krefeld – Round 1 – Kruijer, Cornelius – 0-1 – Engels, Ludwig – G7
1. d4 d5 2. Nf3 Nf6 3. c4 g6 4. Nc3 Bg7 5. Bf4 O-O 6. e3 c5 7. Qb3 cxd4 8. exd4 dxc4 9. Bxc4 Nc6 10. O-O Na5
1938 Ljubljana – Round 10 – Vidmar Milan – 1/2-1/2 – Szabo, Ladislav – G68
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. cxd5 Nxd5 8. Be5 Nc6 9. Bxg7 Kxg7 10. Qd2 cxd4
1938 Trade Unions – Round 13 – Gothilf, Solomon Borisovich – 0-1 – Lilienthal, Andor – G102
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Rc1 cxd4 8. exd4 Nc6 9. Be2 dxc4 10. Bxc4 Bg4
1939 Bournemouth – Round 1 – Abrahams, Gerald – 0-1 – Flohr, Dennis – G8
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Be5 dxc4 8. Bxc4 Nc6 9. O-O cxd4 10. exd4 b6
1939 Buenos Aires ol f-A – Round 5 – Aleman Dovo, Miguel – 0-1 – Prins, Lodewijk – G94
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be2 Nc6 8. dxc5 Qa5 9. O-O dxc4 10. Qa4 Qxc5
1940 New York ch-USA – Round 15 – Kupchik, Abraham – 1/2-1/2 – Polland David – G87
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be2 Qa5 8. O-O cxd4 9. exd4 dxc4 10. Bxc4 Nbd7
1941 Munchen – Round 9 – Nielsen, Bardur – 1-0 – Cortlever, Nico – G71
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be5 cxd4 8. exd4 dxc4 9. Bxc4 Nbd7 10. O-O Nb6
1945 Mar del Plata it-8 – Round 13 – Rossetto, Hector – 0-1 – Pelikán, Jiří – G22
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Qb3 cxd4 8. exd4 Nc6 9. cxd5 Na5 10. Qb5 a6
1945 Novi Sad – Round 8 – Filipcic, Martin – 1/2-1/2 – Rabar, Braslav – G96
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. cxd5 Nxd5 8. Be5 Nc6 9. Bxg7 Kxg7 10. Nxd5 Qxd5
1946 Budapest – Round 1 – Gereben, Erno – 0-1 – Barcza, Gedeon – G5
1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. Qb3 cxd4 8. Nxd4 Nc6 9. cxd5 Na5 10. Qb5 a6
1946 Hastings4647 – Round 5 – Abrahams, Gerald – 1-0 – Prins, Laura – G21
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 O-O 6. e3 c5 7. Be5 dxc4 8. Bxc4 Nc6 9. O-O Bg4 10. Be2 Qa5
1946 London-A – Round 8 – Opocensky, Karel – 1/2-1/2 – Prins, Laura – G19
1. d4 Nf6 2. c4 g6 3. Bf4 Bg7 4. Nc3 d5 5. Nf3 O-O 6. e3 c5 7. Rc1 cxd4 8. exd4 Nc6 9. Ne5 Nxe5 10. Bxe5 Bh6
1947 Schlechter Memorial – Round 1 – Keller, Hans – 0-1 – Gereben, Erno – G2
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be2 cxd4 8. exd4 dxc4 9. Bxc4 Nc6 10. h3 Qb6
1948 Saltsjobaden tt – Round 1 – Nielsen, Axel – 0-1 – Ojanen, Kaarle S – G9
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 O-O 6. e3 c5 7. Qb3 cxd4 8. exd4 dxc4 9. Bxc4 e6 10. O-O Nc6
1949 Mar del Plata – Round 3 – Pomar Salamanca, Arturo – 1/2-1/2 – Lasker, Emanuel – G40
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Rc1 cxd4 8. Nxd4 Nc6 9. Nb3 e5 10. Bg5 d4
1949 Mar del Plata – Round 4 – Gentil Le Roux, Loevan – 1/2-1/2 – Rossetto, Hector – G50
1. Nf3 Nf6 2. d4 g6 3. c4 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. cxd5 Nxd5 8. Be5 Nxc3 9. bxc3 Qa5 10. Qd2 cxd4
1950 Dubrovnik olm – Round 5 – Panagopoulos, Takis – 0-1 – Gligorić, Svetozar – G60
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Be2 cxd4 8. exd4 Nc6 9. Ne5 dxc4 10. Nxc6 bxc6
1950 HUN-ch06 – Round 1 – Koberl, Ferenc – 1-0 – Monostori, Lajos – G35
1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. c4 O-O 5. Nc3 d5 6. e3 c5 7. Be2 cxd4 8. exd4 dxc4 9. O-O Be6 10. Rc1 Nc6
1952 Tatranska ch CZE – Round 10 – Mikula, Ladislav – 0-1 – Pachman, Ludek – G26
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be2 cxd4 8. exd4 Nc6 9. O-O Bg4 10. h3 Bxf3
1953 Wch-jr final – Round 3 – Penrose, Jonathan – 1/2-1/2 – Sherwin, James T – G8
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Be5 cxd4 8. exd4 dxc4 9. Bxc4 Nc6 10. O-O Na5
1954 ARG Ch – Round 3 – Maderna, Carlos – 1-0 – Lipiniks, Leonardo – G5
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 O-O 5. Bf4 d5 6. e3 c5 7. Rc1 Qa5 8. Qb3 cxd4 9. exd4 Nc6 10. cxd5 Nb4
1954 Pan American Ch 2nd – Round 4 – Goldberg, Nathan – 0-1 – Sherwin, James T – G15
1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. Be2 Nc6 8. O-O cxd4 9. exd4 dxc4 10. Bxc4 Bg4
1955 Argentina – Round 15 – Maderna, Carlos – 1-0 – Laurencena Lopez, Gustavo Adrian – G111
1. Nf3 Nf6 2. c4 g6 3. d4 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. Qb3 cxd4 8. Nxd4 dxc4 9. Bxc4 Nbd7 10. Bg3 Nh5
1955 Budapest HUN – Round 1 – Erdy, Bela – 1/2-1/2 – Grob, Henry – G1
1. d4 Nf6 2. c4 g6 3. Bf4 Bg7 4. e3 c5 5. Nc3 O-O 6. Nf3 d5 7. Be2 cxd4 8. exd4 Nc6 9. Ne5 dxc4 10. Nxc6 bxc6
1955 Long Beach US-open – Round 5 – Brandts, Paul – 1-0 – Sherwin, James T – G8
1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. Be2 Nc6 8. O-O cxd4 9. Nxd4 Nxd4 10. Qxd4 Be6
1955 USSR – Round 1 – Rosenberg Morch, Mathias – 0-1 – Tal, Mikhail – G1
1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 O-O 5. Bf4 d5 6. e3 c5 7. Be2 cxd4 8. exd4 Nc6 9. O-O b6 10. Ne5 Bb7
1956 CSR Ch – Round 18 – Marsalek, Josef – 1-0 – Holas, Josef – G167
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Qb3 cxd4 8. Nxd4 dxc4 9. Bxc4 a6 10. Bxb8 Rxb8
1956 Moscow olm prel – Round 2 – Benkner, Otto – 0-1 – Padevsky, Nikola – G46
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. h3 Nc6 8. Be2 Be6 9. Qa4 cxd4 10. exd4 dxc4
1957 USA Ch Open 58th – Round 1 – Hanken, Jerome B – 0-1 – Santasiere, Anthony – G5
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 O-O 6. e3 c5 7. Rc1 cxd4 8. exd4 Nc6 9. Be2 dxc4 10. Bxc4 Bg4
1960 Leipzig olm prel – Round 8 – Kraidman, Yair – 1/2-1/2 – Milev, Zdravko – G278
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Be2 Nc6 8. O-O cxd4 9. Nxd4 Nxd4 10. exd4 dxc4
1961 GDR Ch Premnitz GER – Round 7 – Golz, Werner – 0-1 – Hartmann, Claus – G29
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Be2 cxd4 8. exd4 Nc6 9. O-O Bf5 10. c5 Ne4
1961 Moscow Ch – Round ? – Vasilchuk, Yury – 0-1 – Simagin, Vladimir – G54
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be5 cxd4 8. Bxd4 dxc4 9. Bxc4 Nc6 10. Bxf6 Bxf6
1961 Moscow Ch – Round ? – Volovich, Anatoly – 0-1 – Goldberg, Grigory A – G55
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be5 cxd4 8. exd4 e6 9. c5 Nc6 10. Bd6 Re8
1961 Netanya – Round 2 – Kraidman, Yair – 1-0 – Persitz, Raaphi – G11
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 O-O 6. e3 c5 7. Rc1 cxd4 8. exd4 Nc6 9. h3 Bf5 10. Be2 dxc4
1962 DDR-12ch – Round 12 – Golz, Werner – 1/2-1/2 – Malich, Burkhard, Dr. – G31
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Be2 cxd4 8. exd4 dxc4 9. Bxc4 Bg4 10. O-O Nfd7
1962 Hungary – Round 14 – Dozsa, Paul – 0-1 – Liptay, Laszlo Dr. – G109
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 c5 6. Nf3 O-O 7. Be2 Nc6 8. dxc5 Qa5 9. O-O dxc4 10. Qa4 Qxc5
1962 URU Ch – Round 9 – Olivera, Juan Francisco – 1/2-1/2 – Silva Nazzari, Roberto – G15
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be2 Nc6 8. dxc5 Qa5 9. O-O dxc4 10. Bxc4 Qxc5
1962 Varna – Round 11 – Purevzhav, S – 1/2-1/2 – Jimenez Zerquera, Eleazar – G53
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 O-O 5. Bf4 d5 6. e3 c5 7. Rc1 cxd4 8. Nxd4 Nc6 9. Nxc6 bxc6 10. Be2 Be6
1964 Capablanca Memorial – Round 21 – Donner, Jan-Hein – 1-0 – Garcia Martinez, Silvino – G211
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be2 Be6 8. Ng5 Ne4 9. Ngxe4 dxe4 10. d5 Bc8
1964 Moscow RUS – Round ? – Volovich, Anatoly – 1/2-1/2 – Yudovich, Mikhail M – G40
1. c4 Nf6 2. Nf3 g6 3. d4 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. cxd5 cxd4 8. Qxd4 Nxd5 9. Be5 Nf6 10. Rd1 Bd7
1964 Tel Aviv olm – Round 1 – Rantanen, Martti – 0-1 – Milev, Zdravko – G60
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 O-O 6. e3 c5 7. Be2 Nc6 8. O-O cxd4 9. Nxd4 Nxd4 10. exd4 dxc4
1964 Tel Aviv olm fin-B – Round 3 – Campomanes, Florencio – 1/2-1/2 – Baxter, RWM. – G33
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Be2 Nc6 8. O-O cxd4 9. Nxd4 Nxd4 10. Qxd4 Be6
1964 Tel Aviv olm prel – Round 6 – Rantanen, Matti – 0-1 – Milev, Zdravko – G54
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 O-O 6. e3 c5 7. Be2 Nc6 8. O-O cxd4 9. Nxd4 Nxd4 10. exd4 dxc4
1965 ISR Ch – Round 5 – Ben Moshe, Shalom – 0-1 – Persitz, Raaphi – G15
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 O-O 6. e3 c5 7. Be2 cxd4 8. Nxd4 Nc6 9. Nxc6 bxc6 10. O-O Bf5
1965 Titograd – Round 12 – Cebalo, Miso – 1-0 – Sofrevski, Jovan – G84
1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. Nc3 O-O 5. Bf4 d5 6. e3 c5 7. Be2 Nc6 8. O-O cxd4 9. Nxd4 Nxd4 10. exd4 dxc4
1966 La Habana olm prel – Round 5 – Campomanes, Florencio – 1/2-1/2 – Glauser, Hansruediger – G186
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Be2 Nc6 8. O-O cxd4 9. Nxd4 Nxd4 10. Qxd4 Be6
1967 Halle zt – Round 1 – Zinn, Lothar – 1/2-1/2 – Uhlmann, Wolfgang – G2
1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. Be2 cxd4 8. exd4 Nc6 9. O-O Bg4 10. c5 Ne4
1967 ISR Ch – Round 11 – Aloni, Itzchak – 1-0 – Bar Ziv, Izak – G47
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Nf3 c5 7. Be2 Nc6 8. dxc5 Qa5 9. O-O dxc4 10. Bxc4 Qxc5
1968 Cardenas/Matanzas/Santa Clara – Round 2 – Angulo Castillo, Francisco – 0-1 – Garcia Martinez, Silvino – G13
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 O-O 6. e3 c5 7. Be2 Nc6 8. O-O cxd4 9. exd4 dxc4 10. Bxc4 Na5
1968 Lugano SUI – Round 7 – Camara, Helder – 0-1 – Cobo Arteaga, Eldis – G89
1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. Bf4 O-O 6. e3 c5 7. Be2 cxd4 8. exd4 Nc6 9. O-O Bg4 10. c5 Ne4
World Blitz 2022 – Round 1.88 – Petrosyan, Manuel – 1/2-1/2 – Nissinen, Niilo Man – G61
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 c5 7. Rc1 cxd4 8. Nxd4 a6 9. Be2 dxc4 10. Bxc4 b5

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