D45c — Semi-Slav: 5.e3 Be7

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Be7 * ○ Trait aux Blancs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte d4, case forte e5, paire de fous.
Faiblesses adverses : Bc8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, Bf1 enfermé, 4 pièces non développées (C1, F1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● Bd2 — Développer Bc1
● Bd3 — Développer Bf1
● h3 — Empêcher ...Bg4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : case forte e4, avant-poste e4(C), Be7 actif, paire de fous.
Faiblesses adverses : Bc1 enfermé, Bf1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, 4 pièces non développées (B8, C8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...Bd7 — PRIORITÉ: libérer le Bc8 (...Bd7, b6+Bb7, ...Bg4, ...Bf5)
● ...Nbd7 — Développer Nb8
● ...Bg4 — Clouer Nf3
● ...c5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

D45c —

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Be7

Eval: [+0.34]

Les coups candidats

6.Bd3 — 60.7% (3303 parties)

Ambassadeurs : Basson, Heinrich (14x), Steiner, Lajos (7x), ? (6x), Stull, Norbert (5x), Gereben, Erno (4x), Commons, Kim S (4x), Hackbarth, Christa (4x), Horvath, Ilona Klara (4x)

6.Qc2 — 21.0% (1141 parties)

Ambassadeurs : Plahuta, Darko (4x), Gudat, Alfons (4x), Kovacs, Marton (4x), Kock, Hans-Uwe (4x), Jahn, Constanze (3x), Paasikangas, Johanna (3x), Kuenitz, Klaus (3x), Czyz, Pawel (3x)

6.Be2 — 6.3% (341 parties)

Ambassadeurs : Manoliu, Marian (2x), ? (2x), Kovacs, Sandor (2x), Konya, Laszlo (2x), Hoeschele, Hans-Ulrich (2x), Alsemairi, Dalia (2x), Fabbri , Leonardo (1x), Ramella, Andrei (1x)

6.b3 — 5.4% (295 parties)

Ambassadeurs : Basson, Heinrich (4x), Le Thanh Tu (3x), Aloni, Itzchak (2x), Panno, Oscar (2x), Sadzikowski, Daniel (2x), Ederer, Karel (2x), Votruba, Pavel (2x), von Koslowski, Utz (2x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	6.Bd3	6.Qc2	6.Be2	6.b3
<1800	373	57%	16%	10%	8%
1800-2200	2663	59%	23%	6%	5%
2200-2600	911	63%	26%	3%	7%
2600+	9	44%	33%	—	22%

Évolution par décennie (% des parties)

Décennie	N parties	6.Bd3	6.Qc2	6.Be2	6.b3
1870s	1	100%	—	—	—
1890s	2	50%	—	—	—
1900s	3	67%	—	—	—
1920s	11	82%	9%	—	—
1930s	45	78%	9%	—	—
1940s	27	89%	4%	—	7%
1950s	41	63%	22%	—	15%
1960s	59	81%	8%	5%	3%
1970s	64	69%	12%	3%	11%
1980s	138	65%	20%	5%	6%
1990s	843	61%	21%	7%	4%
2000s	1889	61%	22%	6%	4%
2010s	2013	59%	21%	6%	7%
2020s	302	52%	25%	10%	9%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
6.Bd3	59%	52%	▼ -7.4%
6.Qc2	21%	25%	▲ +3.5%
6.Be2	6%	10%	▲ +4.3%
6.b3	7%	9%	▲ +2.1%

Joueurs célèbres

Champions du monde dans cette position

Alekhine, Alexander — 3 parties
Euwe, Max — 2 parties
Lasker, Emanuel — 1 partie
Karpov, Anatoly — 1 partie
Gukesh D — 1 partie

Parties historiques

6.Bd3 — 60.7% (3303 parties)

1874 — Elder, Frederic vs Bock, Frederic — 0-1 — Chicago, IL USA
1893 — Lasker, Emanuel vs Hanham, James — 1-0 — New York, NY USA
1907 — Olley, R vs Carey, J W — 1-0 — ?
1907 — Sergeant, Edward vs Wainwright snr, George Edward — 0-1 — Crystal Palace
1923 — Alekhine, Alexander vs Nait ahmed, Azzedine — 1-0 — Boston, MA USA

6.Qc2 — 21.0% (1141 parties)

1924 — Fox, Maurice vs Ledain, Dudley M — 1-0 — Hamilton
1931 — Rubinstein, Akiba vs Daniuszewski, Dawid — 0-1 — Lodz POL
1935 — Kolski, Josek vs Steiner, Lajos — 1-0 — Lodz POL
1938 — Lipnitsky, Isaac vs Bronstein, David I — 1/2-1/2 — Kiev Adults-Juniors
1939 — Van Doesburgh, Gerrit vs Fazekas, Stephan — 0-1 — Margate ENG

6.Be2 — 6.3% (341 parties)

1962 — Detthow, Bo vs Seabra, Geraldo — 1-0 — Campinas
1967 — Dabin, E. vs Esquivel Vargas, Hersson — 1-0 — Mar del Plata ARG
1969 — Fabbri , Leonardo vs Ramella, Andrei — 0-1 — Imperia
1975 — Kovacs, Laszlo M vs Blatny, Frantisek — 1-0 — Decin CZE
1979 — Ornstein, Axel vs Schneider, Lars-Ake — 1-0 — Stockholm SWE

6.b3 — 5.4% (295 parties)

1942 — Heesche, L. vs Willemoes, P. — 1-0 — North Sundby
1948 — Richter, Edgar vs Vidmar, Marjeta — 1/2-1/2 — Karlovy Vary
1952 — Zalys, Ignas vs Salisnjak, J. — 1-0 — Montreal CAN
1952 — Neikirkh, Oleg vs Jakovlev, Evgeni — 1-0 — Sofia BUL
1954 — Aloni, Itzchak vs Panno, Oscar — 1/2-1/2 — Olympiad final A

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● f2→e3, e3→d4	● c6→d5, e6→d5, b7→c6, f7→e6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d4 (3v0), ● e5 (2v0)	● e4 (2v1)
Cases faibles	—	—
Centre	● d4 (3v0), ● e5 (2v0)	● d5 (4v2), ● e4 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 1)
Bf1	● Bf1 Non développé (mob. 2)
Be7		● Be7 Actif (mob. 5)
Bc8		● Bc8 Non développé (mob. 1)
Paire de fous	● Oui	● Oui
Non développées	4 (c1, f1, a1, h1)	4 (b8, c8, 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	fermé
Ruptures	● c4-c5, ● e3-e4	● …c6-c5, ● …e6-e5

Partie
1907 BCF Ch 4th – Round 5 – Sergeant, Edward – 0-1 – Wainwright snr, George Edward – G9 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 c6 5. e3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 Bb7 10. Qe2 a6
1928 Barcelona sim – Round ? – Alekhine, Alexander – 1/2-1/2 – Alderete, Rigoberto – G4 1. c4 c6 2. d4 d5 3. Nf3 Nf6 4. Nc3 e6 5. e3 Be7 6. Bd3 dxc4 7. Bxc4 b5 8. Bb3 Nbd7 9. O-O O-O 10. a3 Bb7
1931 Budapest – Round 1 – Havasi, Kornel – 1/2-1/2 – Steiner, Lajos – G3 1. d4 d5 2. c4 c6 3. e3 Nf6 4. Nc3 e6 5. Nf3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 Nbd7 9. e4 b5 10. Bd3 b4
1931 New York – Round 1 – Capablanca, Jose – 1/2-1/2 – Harvard Univ – G17 1. Nf3 Nf6 2. c4 c6 3. Nc3 d5 4. d4 e6 5. e3 Be7 6. a3 O-O 7. Qc2 Nbd7 8. Bd3 dxc4 9. Bxc4 Qc7 10. O-O e5
1932 Trebitsch mem15 – Round 3 – Mueller, Hans – 1/2-1/2 – Eliskases, Erich – G6 1. d4 d5 2. c4 c6 3. Nf3 e6 4. e3 Nf6 5. Nc3 Be7 6. Bd3 b6 7. O-O Bb7 8. b3 O-O 9. Bb2 c5 10. cxd5 Nxd5
1934 Hastings3435 – Round 1 – Michell, Reginald – 1-0 – Norman, George – G5 1. d4 d5 2. c4 c6 3. e3 Nf6 4. Nc3 e6 5. Nf3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Ne2 Nbd7
1934 Hastings3435 – Round 1 – Norman, George – 1/2-1/2 – Lilienthal, Andor – G7 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Be7 6. Bd3 dxc4 7. Bxc4 O-O 8. O-O b5 9. Bd3 b4 10. Na4 Ba6
1935 Argentina – Round 13 – Piazzini, Luis – 0-1 – Grau, Roberto G – G13 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Be7 6. Ne5 O-O 7. Bd3 dxc4 8. Bxc4 Nbd7 9. f4 c5 10. O-O cxd4
1935 Lodz – Round 8 – Kolski, Josek – 1-0 – Steiner, Lajos – G9 1. d4 d5 2. c4 c6 3. e3 Nf6 4. Nc3 e6 5. Nf3 Be7 6. Qc2 O-O 7. a3 Nbd7 8. Bd3 c5 9. O-O cxd4 10. exd4 dxc4
1935 Lodz IT – Round 6 – Winter, William – 1/2-1/2 – Appel, Izaak – G7 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Ne4 Ba6
1935 Tatatovaros – Round 3 – Sacconi, Antonio – 1/2-1/2 – Gereben, Erno – G18 1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. Nc3 c6 5. e3 Be7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 Nbd7 10. O-O b4
1935 Vienna – Round 10 – Gruenfeld, Ernst – 1/2-1/2 – Kolnhofer, Josef – G50 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Be7 6. Ne5 O-O 7. Bd3 dxc4 8. Bxc4 c5 9. O-O a6 10. a4 Qc7
1935 Vienna – Round 11 – Becker, Albert – 1/2-1/2 – Mueller, Hans – G54 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Ne4 Ba6
1935 Vienna – Round 5 – Gruenfeld, Ernst – 1-0 – Steiner, Lajos – G31 1. d4 d5 2. c4 c6 3. e3 Nf6 4. Nc3 e6 5. Nf3 Be7 6. Bd3 dxc4 7. Bxc4 O-O 8. O-O b5 9. Bd3 b4 10. Ne4 Ba6
1935 Warsaw POL – Round 1 – Pleci, Isaias – 1-0 – Szabo, Laszlo – G1 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Ne2 Ba6
1936 Budapest – Round 12 – Glass, Eduard – 1-0 – Szigeti, Miklos – G42 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. e3 e6 5. Nc3 Be7 6. a3 O-O 7. Qc2 Nbd7 8. Bd2 a6 9. Rd1 dxc4 10. Bxc4 b5
1936 Mar del Plata – Round 14 – Vinuesa, Juan – 0-1 – Pleci, Isaias – G93 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Na4 Ba6
1936 Semmering m – Round 2 – Eliskases, Erich – 1/2-1/2 – Spielmann, Rudolf – G2 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Na4 Ba6
1936 UJCS-14.Kongress – Round 7 – Gilg, Karl – 1-0 – May, Desider – G17 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. e3 e6 5. Nc3 Be7 6. Bd3 O-O 7. O-O b6 8. Ne5 Bb7 9. cxd5 cxd5 10. f4 Ne4
1938 Argentina – Round 3 – Bolbochan, J. – 1/2-1/2 – Pasero, Paolina – G12 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Nb1 Ba6
1938 Lodz – Round 1 – Najdorf, Miguel – 0-1 – Appel, Israel – G21 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. e3 e6 5. Nc3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Ne4 Ba6
1939 Amsterdam VARA – Round 1 – Euwe, Max – 1-0 – Szabo, Ladislav – G1 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Na4 Ba6
1939 Margate Premier Reserves A – Round 9 – Landau, Salo – 1-0 – Prins, Lodewijk – G12 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Be7 6. Bd3 O-O 7. O-O b6 8. b3 Nbd7 9. Bb2 Bb7 10. Qe2 dxc4
1942 GER Ch 09th – Round 10 – Loose, Walter – 1-0 – Niephaus, Walter – G18 1. Nf3 d5 2. d4 e6 3. c4 c6 4. e3 Nf6 5. Nc3 Be7 6. Bd3 dxc4 7. Bxc4 c5 8. O-O O-O 9. dxc5 Bxc5 10. Qe2 a6
1946 Maastricht – Round 8 – Wolthuis, Willem – 0-1 – Soultanbeieff, Victor – G33 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Be7 6. Bd3 O-O 7. O-O b6 8. Qe2 Nbd7 9. Rd1 Qc7 10. b3 e5
1946 Pittsburgh Open – Round 1 – Almgren, Sven – 0-1 – Aguilar Aleman, Diego Ignacio – G26 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 c6 5. e3 Be7 6. Bd3 dxc4 7. Bxc4 Nbd7 8. O-O b5 9. Bd3 a6 10. e4 b4
1948 Budapest HUN – Round 2 – Barcza, Gedeon – 1-0 – Füster, Géza – G6 1. d4 Nf6 2. c4 c6 3. Nc3 d5 4. e3 e6 5. Nf3 Be7 6. Bd3 dxc4 7. Bxc4 c5 8. O-O Nc6 9. dxc5 Bxc5 10. Qxd8+ Kxd8
1948 Karlovy Vary – Round 13 – Richter, Edgar – 1/2-1/2 – Vidmar, Marjeta – G125 1. c4 c6 2. d4 d5 3. e3 e6 4. Nf3 Nf6 5. Nc3 Be7 6. b3 O-O 7. Bd3 c5 8. O-O Nc6 9. dxc5 Bxc5 10. Bb2 Qe7
1948 Karlovy Vary – Round 8 – Foltys, Jan – 1-0 – Steiner, Laszlo – G82 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Be7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 b4 9. Na4 Ba6 10. O-O O-O
1948 Saltsjobaden Interzonal – Round 5 – Kotov Lundqvist, Alex – 1-0 – Steiner, Laszlo – G37 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Be7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 b4 9. Na4 Ba6 10. O-O O-O
1952 Budapest HUN – Round ? – Kluger, Gyula – 1-0 – Typary, L – G14 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Be7 6. Qc2 O-O 7. b3 a6 8. Bd3 b5 9. O-O Nbd7 10. Bb2 Ra7
1956 USSR Ch Semifinal – Round 3 – Korchnoi, Viktor – 1/2-1/2 – Voronkov, Boris – G5 1. c4 c6 2. d4 d5 3. Nc3 Nf6 4. e3 e6 5. Nf3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Ne4 Ba6
1959 Berlin Ch – Round 2 – Elstner, Rudolf – 1-0 – Seppelt, Alfred – G4 1. d4 d5 2. Nf3 e6 3. c4 c6 4. e3 Nf6 5. Nc3 Be7 6. Bd3 O-O 7. O-O dxc4 8. Bxc4 b5 9. Bd3 b4 10. Na4 Ba6
1959 UKR Ch – Round 14 – Kostiuchenko, Alexander – 1-0 – Zamikhovsky, Abram – G103 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Be7 6. b3 O-O 7. Bd3 c5 8. cxd5 cxd4 9. Nxd4 Nxd5 10. Nxd5 Qxd5
1961 CSR Ch – Round 2 – Pachman, Ludek – 1/2-1/2 – Trmal, Jaroslav – G11 1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 c6 5. e3 Be7 6. Qc2 O-O 7. b3 b6 8. Bb2 Bb7 9. Rd1 Nbd7 10. Bd3 Rc8
1962 Stockholm Interzonal – Round 15 – Schweber, Samuel – 1/2-1/2 – Yanofsky, Daniel Abraham – G131 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Be7 6. Bd3 O-O 7. cxd5 cxd5 8. O-O Nc6 9. b3 b6 10. Bb2 Bb7
1964 Budapest ch-HUN – Round 1 – Bilek, Istvan – 1/2-1/2 – Hajtun, Jozsef – G67 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Be7 6. Qc2 O-O 7. Bd2 Nbd7 8. O-O-O a5 9. e4 b5 10. exd5 b4
1964 DDR Ch 14th – Round 1 – Malich, Burkhard, Dr. – 1/2-1/2 – Bruemmer, Ullrich – G1 1. c4 Nf6 2. Nf3 c6 3. d4 d5 4. Nc3 e6 5. e3 Be7 6. Bd3 dxc4 7. Bxc4 O-O 8. O-O c5 9. Qe2 a6 10. dxc5 Bxc5
1964 Sarajevo 7th – Round 5 – Polugaevsky, Lev – 1-0 – Kozomara, Vlado – G6 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 c6 5. e3 Be7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. O-O c5 10. dxc5 Nc6
1965 Budapest HUN – Round 3 – Osnos, Viatcheslav – 1-0 – Kovacs, Laszlo M – G16 1. Nf3 d5 2. c4 c6 3. d4 Nf6 4. Nc3 e6 5. e3 Be7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 Bb7 10. e5 Nd5
1965 Hungary – Round 1 – Kluger, Gyula – 1-0 – Hajtun, Joseph – G15 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Be7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O Nbd7
1966 Rio Hondo zt – Round 7 – Quinones Carrillo, Oscar – 0-1 – Acevedo Carmona, Juan Diego – G14 1. Nf3 Nf6 2. c4 e6 3. e3 d5 4. d4 Be7 5. Nc3 c6 6. Bd3 a6 7. O-O O-O 8. b3 b5 9. Qc2 Nbd7 10. Ne5 Bb7
1968 Moscow Ch – Round 1 – Petrosian, Tigran A. – 1-0 – Ageichenko, Genadi A – G5 1. c4 Nf6 2. Nc3 c6 3. d4 d5 4. Nf3 e6 5. e3 Be7 6. b3 O-O 7. Bb2 Nbd7 8. Bd3 b6 9. O-O Bb7 10. Qe2 Bd6
1969 Schwerin – Round 5 – Baumbach, Friedrich, Dr. – 1-0 – Pfeil, Antoine – G48 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Be7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O O-O
85. Tata Steel Masters 2023 – Round 9.6 – Aronian, Levon – 1/2-1/2 – Van Foreest, Jorden – G62 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Be7 6. Qc2 O-O 7. b3 dxc4 8. Bxc4 b5 9. Be2 Bb7 10. O-O Nbd7
Levitov Chess Week Rapid 2023 – Round 6.1 – Gelfand, Boris – 0-1 – Aronian, Levon – G26 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 e6 5. e3 Be7 6. Qc2 O-O 7. b3 dxc4 8. Bxc4 b5 9. Bd3 Na6 10. a3 b4

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