C70j — Spanish: Cozio Deferred

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nge7 * ○ Trait aux Blancs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : paire de fous.
Faiblesses adverses : Bc8 enfermé, Bf8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, 4 pièces non développées (B1, C1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● Nbd2 — Développer Nb1
● d3 — Libérer Bc1
● h3 — Empêcher ...Bg4
● c3 — Préparer d4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : case forte d4, paire de fous.
Faiblesses adverses : Bc1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, Bf8 enfermé, 4 pièces non développées (C8, F8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...d6 — Libérer Bc8
● ...Bd6 — Développer Bf8
● ...Bg4 — Clouer Nf3
● ...d5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

C70j — Cozio Deferred

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nge7

Eval: [+0.56]

Les coups candidats

5.c3 — 39.3% (1253 parties)

Ambassadeurs : Avellan, Gerardo (18x), Celan, Melissa (16x), Kivimaki, Jaakko (10x), Blazeka, Matej (10x), Vavulin, Maxim (10x), Plutarco, Fosca (9x), Rantanen, Yrjo A. (8x), Czebe, Attila (8x)

5.O-O — 38.6% (1230 parties)

Ambassadeurs : Avellan, Gerardo (21x), Avellán, Gerardo (15x), Kivimaki, Jaakko (13x), Raineri, Angelo Valerio (10x), Rajkovic, Mladen (9x), Banusz, Tamas (8x), Nestorovic, Nikola (7x), Proudian, Armen (7x)

5.Nc3 — 11.3% (360 parties)

Ambassadeurs : Kivimaki, Jaakko (5x), Mozes, Ervin (5x), Blazeka, Matej (5x), Nestorovic, Nikola (5x), Grover Shivaksh (4x), Czupor, Attila (4x), Alekhine, Alexander (3x), Tomazini, Aljosa (3x)

5.d4 — 4.5% (144 parties)

Ambassadeurs : Steinitz, Wilhelm (23x), Abad Martinez, Diego (3x), Meitner, Philipp (3x), Sellman, Alexander (3x), Reipsch, Jens (3x), Van Foreest, Jorden (3x), Semenova, El1 (3x), Den Hartog, Marijn (3x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	5.c3	5.O-O	5.Nc3	5.d4
<1800	57	46%	39%	12%	2%
1800-2200	909	37%	46%	8%	4%
2200-2600	1912	42%	35%	13%	3%
2600+	112	43%	34%	12%	3%

Évolution par décennie (% des parties)

Décennie	N parties	5.c3	5.O-O	5.Nc3	5.d4
1860s	1	—	100%	—	—
1880s	36	—	11%	—	86%
1890s	4	—	25%	25%	50%
1900s	10	50%	20%	—	20%
1910s	4	—	25%	25%	25%
1920s	2	—	—	100%	—
1940s	3	—	33%	67%	—
1950s	4	—	50%	—	25%
1960s	2	—	50%	50%	—
1970s	12	33%	50%	—	17%
1980s	30	47%	30%	13%	10%
1990s	102	36%	44%	11%	6%
2000s	163	32%	51%	7%	4%
2010s	2171	39%	40%	10%	3%
2020s	645	45%	33%	17%	2%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
5.c3	39%	45%	▲ +5.4%
5.O-O	40%	33%	▼ -6.8%
5.Nc3	10%	17%	▲ +7.1%
5.d4	3%	2%	▼ -1.1%

Joueurs célèbres

Champions du monde dans cette position

Steinitz, Wilhelm — 10 parties
Gukesh D — 4 parties
Alekhine, Alexander — 3 parties
Hou, Yifan — 3 parties
Anand, Viswanathan — 2 parties
Ju, Wenjun — 1 partie

Parties historiques

5.c3 — 39.3% (1253 parties)

1901 — Taubenhaus, Jean vs Sittenfeld, Stanislaus — 1/2-1/2 — Paris FRA
1901 — Taubenhaus, Jean vs Sittenfeld, Stanislaus — 1/2-1/2 — Parijs
1903 — Rabinovich, Alexander vs Schiffers, Emanuel — 0-1 — Kiev UKR
1903 — Rabinovich, Alexander vs Kalinsky, N. — 1-0 — Kiev UKR
1903 — Lovtsky, M. vs Kalinsky, N. — 1-0 — Kiev UKR

5.O-O — 38.6% (1230 parties)

1864 — Neumann, Gustav vs Anderssen, Adolf — 0-1 — Breslau GER
1883 — Leffmann, Karl vs White, Max — 1/2-1/2 — Nuerenberg GER
1887 — Baird, John vs Lipschuetz, Salomon — 1-0 — New York, NY USA
1888 — Lee, Francis J vs Locock, Charles Dealtry — 1/2-1/2 — Bradford/ Yorkshire
1888 — Georg Irion vs Tarrasch, Siegbert — 0-1 — Nuerenberg GER

5.Nc3 — 11.3% (360 parties)

1891 — ? vs Kvicala, Jan — 0-1 — Prague CZE
1913 — Yates, Frederic D vs Speijer, Abraham — 0-1 — Scheveningen NED
1921 — Schulz, Jale vs Treybal, Karel — 1/2-1/2 — Brno Morava
1921 — D Marco, Gianni vs Alekhine, Alexander — 0-1 — The Hague NED
1940 — Alekhine, Alexander vs Arrais, Ayoub — 1-0 — Lisabon

5.d4 — 4.5% (144 parties)

1882 — Michaelis, O vs Steinitz, Wilhelm — 1-0 — Philadelphia, PA USA
1882 — McKenzie, George vs Steinitz, Wilhelm — 1/2-1/2 — Vienna AUT
1882 — Blackburne, Joseph vs Steinitz, Wilhelm — 1-0 — Vienna AUT
1882 — Abad Martinez, Diego vs Steinitz, Wilhelm — 0-1 — Philadelphia, PA USA
1882 — Charles AmÃdÃe Maurian vs Steinitz, Wilhelm — 0-1 — New Orleans, LA USA

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● b7→a6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	● d4 (2v1)
Cases faibles	—	—
Centre	—	● d4 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Ba4	● Ba4 Ok (mob. 3)
Bc8		● Bc8 Non développé (mob. 0)
Bf8		● Bf8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	4 (b1, c1, a1, h1)	4 (c8, f8, 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	● c2-c3, ● d2-d3	● …d7-d6, ● …d7-d5, ● …f7-f6, ● …f7-f5

Partie
19. European Teams 2013 – Round 5.7 – Pavasovic, Dusko – 0-1 – Aronian, Levon – G196 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. Bb3 d5 6. Nc3 Be6 7. Ng5 Nd4 8. O-O Nxb3 9. axb3 d4 10. Nxe6 fxe6
1911 Cologne-A – Round 6 – Breyer, Gyula – 1/2-1/2 – Tereshchenko, Nikolay Semenovich – G8 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. d3 Ng6 6. Nc3 b5 7. Bb3 Na5 8. Bd2 Nxb3 9. axb3 Bb7 10. h4 d6
1913 Scheveningen – Round 10 – Yates, Frederic D – 0-1 – Speijer, Abraham – G28 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. Nc3 d6 6. Bb3 Ng6 7. d3 Be7 8. Be3 Na5 9. Qe2 Nxb3 10. axb3 O-O
1921 Brno Morava – Round 2 – Schulz, Jale – 1/2-1/2 – Treybal, Karel – G4 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. Nc3 d6 6. O-O h6 7. Nd5 Be6 8. d4 b5 9. Bb3 Nxd4 10. Nxd4 exd4
1921 The Hague – Round 2 – D Marco, Gianni – 0-1 – Alekhine, Alexander – G10 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. Nc3 g6 6. d4 Bg7 7. dxe5 Nxe5 8. Nxe5 Bxe5 9. Bh6 c5 10. Bb3 b5
1946 Moscow RUS – Round 1 – Chistiakov, Alexander – 1-0 – Solntsev, Yury – G39 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O g6 6. c3 d6 7. d4 Bd7 8. dxe5 dxe5 9. Be3 Bg7 10. Qd2 O-O
1950 Hungary – Round 1 – Szily, Jozsef – 1/2-1/2 – Sebestyen, Balazs – G67 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. d4 exd4 6. Bb3 d5 7. exd5 Nxd5 8. Nxd4 Nxd4 9. Qxd4 Qe7+ 10. Kf1 Nb4
1950 Szczawno Zdroj – Round 1 – Keres, Paul – 1-0 – Barcza, Gedeon – G6 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. Bb3 f6 6. d4 d6 7. c3 Na5 8. Bc2 g6 9. Nbd2 Bg7 10. dxe5 dxe5
20. European Teams 2015 – Round 3.9 – Hjartarson, Johann – 1/2-1/2 – Ipatov, Alexander – G148 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O g6 6. c3 Bg7 7. d4 exd4 8. cxd4 b5 9. Bc2 d6 10. h3 O-O
2024 Superbet Chess Blitz – Round 5 – Duda Jan-Krzysztof – 0-1 – Gukesh D – G23 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O Ng6 6. c3 d5 7. exd5 Qxd5 8. Bb3 Qd3 9. Bc2 Qd8 10. Re1 Be7
2024 SuperUnited Rapid & Blitz Croatia – Round 16 – Vachier-Lagrave Maxime – 1/2-1/2 – Caruana Fabiano – G77 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 Ng6 6. d4 exd4 7. cxd4 Bb4+ 8. Nc3 d5 9. exd5 Bxc3+ 10. bxc3 Qxd5
2024 SuperUnited Rapid & Blitz Croatia – Round 26 – Aronian Levon – 1/2-1/2 – Nepomniachtchi Ian – G129 1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. Be2 e5 5. O-O Be7 6. d3 O-O 7. Nbd2 Nc6 8. a3 b5 9. d4 exd4 10. cxd4 cxd4
2026 Tata Steel India Blitz - Round 1.4 - Niemann, Hans Moke - 1-0 - Praggnanandhaa R - G4 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 Ng6 6. d4 exd4 7. Nxd4 Bc5 8. Be3 Nce5 9. Qe2 b5 10. Bb3 a5
40. Olympiad Open 2012 – Round 8.3 – Akopian, Vladimir – 1-0 – Dzhumaev, Marat – G465 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. Bb3 d5 6. Nc3 Be6 7. Ng5 Nd4 8. Nxe6 fxe6 9. d3 Ng6 10. Qg4 Bb4
41. Olympiad Open 2014 – Round 2.9 – Guseinov, Gadir – 1-0 – Tate, Alan – G169 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. d3 g6 6. O-O Bg7 7. c3 O-O 8. Re1 d6 9. Nbd2 h6 10. Nf1 f5
64. ch-RUS 2011 – Round 5 – Timofeev, Artyom – 0-1 – Svidler, Peter – G14 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 g6 6. d4 exd4 7. Nxd4 Bg7 8. Be3 O-O 9. O-O b5 10. Bc2 Ne5
8. Tal Mem Blitz 2013 – Round 5 – Karjakin, Sergey – 1/2-1/2 – Mamedyarov, Shakhriyar – G24 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 g6 6. d4 exd4 7. cxd4 b5 8. Bc2 d5 9. exd5 Nxd5 10. O-O Be6
Amber-rapid 20th 2011 – Round 11 – Karjakin, Sergey – 1/2-1/2 – Aronian, Levon – G32 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 g6 6. d4 exd4 7. cxd4 b5 8. Bc2 d5 9. e5 Bg7 10. Nbd2 O-O
European Club Cup 2015 – Round 7.3 – Dvoirys, Semen I. – 0-1 – Kryvoruchko, Yuriy – G134 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O g6 6. c3 Bg7 7. d4 exd4 8. cxd4 O-O 9. d5 Na5 10. Nc3 b5
FIDE Candidates 2024 - Round 10 - Caruana, Fabiano - 1-0 - Firouzja, Alireza 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Rg1 h5 7. Bc4 g6 8. Bg5 Bg7 9. Qd2 Qa5 10. O-O-O Nc6
FIDE Grand Swiss 2025 – Round 5 – Ponomariov Ruslan – 1/2-1/2 – Deac Bogdan-Daniel – G259 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O Ng6 6. d4 exd4 7. Nxd4 Nxd4 8. Qxd4 b5 9. Bb3 Bb7 10. c4 c5
FIDE World Blitz Championship 2025 – Round 8 – Moussard Jules – 0-1 – Daniil Dubov – G150 1. e4 c5 2. d4 cxd4 3. Qxd4 Nc6 4. Qd3 Nf6 5. Nc3 g6 6. Nf3 Bg7 7. Be2 O-O 8. O-O d6 9. Nd5 Nd7 10. c3 Nc5
FIDE World Cup 2025 – Round R2 Armageddon – Svane – 1-0 – Rauf Mamedov – G436 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. a4 b4 9. a5 d6 10. c3 Rb8
FIDE World Rapid Championship 2025 – Round 12 – Nepomniachtchi Ian – 1/2-1/2 – Praggnanandhaa R – G226 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O Ng6 6. d4 exd4 7. Nxd4 Bc5 8. c3 O-O 9. Be3 Ba7 10. Nxc6 dxc6
GCT Blitz YourNextMove 2018 – Round 17.2 – Anand, Viswanathan – 1-0 – Giri, Anish – G82 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O g6 6. c3 Bg7 7. d4 exd4 8. cxd4 b5 9. Bb3 O-O 10. Nc3 d6
GCT Blitz YourNextMove 2018 – Round 3.2 – Caruana, Fabiano – 1/2-1/2 – Giri, Anish – G12 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O g6 6. c3 Bg7 7. d4 exd4 8. cxd4 b5 9. Bc2 d5 10. exd5 Nb4
Lindores Abbey Tal Memorial 2021 – Round 1.53 – Arakhamia-Grant, Ketevan – 1-0 – Demchenko, Aleksandr – G49 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 Ng6 6. O-O d5 7. d3 Be7 8. Nbd2 O-O 9. Re1 b5 10. Bb3 Be6
Lindores Abbey Tal Memorial 2021 – Round 14.36 – Morovic Fernandez, Ivan – 1-0 – Demchenko, Aleksandr – G617 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O Ng6 6. c3 d5 7. d3 Be7 8. Re1 O-O 9. Nbd2 Be6 10. Nf1 b5
Lindores Abbey Tal Memorial 2021 – Round 16.32 – Kuybokarov, Temur – 1-0 – Henriquez Villagra, Cristobal – G694 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 Ng6 6. d4 exd4 7. cxd4 d5 8. exd5 Qxd5 9. Nc3 Qh5 10. O-O Bd6
Renova FIDE GP Zug 2013 – Round 7.3 – Leko, Peter – 1/2-1/2 – Mamedyarov, Shakhriyar – G38 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 g6 6. d4 exd4 7. cxd4 b5 8. Bc2 d5 9. exd5 Nxd5 10. O-O Be6
Saint Louis Blitz 2024 - Round 8 - Vachier Lagrave Maxime - 1-0 - Praggnanandhaa R - G39 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 Ng6 6. d4 exd4 7. cxd4 Bb4+ 8. Nc3 d5 9. O-O dxe4 10. Nxe4 O-O
Saint Louis Rapid and Blitz 2025 – Round 16 – Gukesh D – 0-1 – Le Quang Liem – G80 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 Ng6 6. d4 exd4 7. cxd4 d5 8. exd5 Qxd5 9. O-O Bg4 10. Nc3 Qh5
SportAccord Blitz 2014 – Round 6.8 – Dominguez Perez, Leinier – 0-1 – Mamedyarov, Shakhriyar – G48 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. Bb3 Ng6 6. d4 exd4 7. O-O Be7 8. Nxd4 Na5 9. Nf5 O-O 10. Nc3 Nxb3
World Blitz 2021 – Round 17.45 – Saric, Ivan – 1-0 – Paravyan, David – G1012 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O Ng6 6. c3 d5 7. d3 Be7 8. Re1 O-O 9. Nbd2 Be6 10. Nf1 b5
World Blitz 2021 – Round 17.49 – Sychev, Klementy – 1/2-1/2 – Durarbayli, Vasif – G1016 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 g6 6. d4 exd4 7. cxd4 b5 8. Bb3 Bg7 9. d5 Na5 10. Bd2 Nxb3
World Blitz 2021 – Round 18.54 – Puranik, Abhimanyu – 1-0 – Bartel, Mateusz – G1075 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. Nc3 Ng6 6. h4 Nf4 7. g3 Ne6 8. d3 Bc5 9. Nd5 d6 10. Be3 Bxe3
World Blitz 2021 – Round 19.57 – Szpar, Milosz – 0-1 – Durarbayli, Vasif – G1134 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O g6 6. c3 b5 7. Bb3 Bg7 8. d4 exd4 9. cxd4 d6 10. h3 O-O
World Blitz 2022 – Round 20.29 – Niemann, Hans Moke – 1/2-1/2 – Sychev, Klementy – G1060 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O Ng6 6. c3 d5 7. exd5 Qxd5 8. Bb3 Qd3 9. Ng5 Nd8 10. Bc2 Qd6
World Blitz 2022 – Round 21.55 – Dragnev, Valentin – 1-0 – Durarbayli, Vasif – G1136 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 g6 6. d4 exd4 7. cxd4 b5 8. Bc2 d5 9. exd5 Nxd5 10. O-O Be6
World Blitz 2023 – Round 17.37 – Gukesh D – 1-0 – Demchenko, Aleksandr – G980 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. O-O Ng6 6. c3 d6 7. d4 Bd7 8. d5 Nb8 9. Bxd7+ Qxd7 10. c4 Be7
World Blitz 2023 – Round 19.65 – Agmanov, Zhandos – 1-0 – Demchenko, Aleksandr – G1109 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 Ng6 6. d4 exd4 7. Nxd4 Be7 8. O-O O-O 9. Be3 b5 10. Bc2 Bb7
World Blitz 2023 – Round 7.14 – Gharibyan, Mamikon – 0-1 – Yakubboev, Nodirbek – G388 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 Ng6 6. d4 exd4 7. cxd4 d5 8. exd5 Qxd5 9. Nc3 Bb4 10. O-O Bxc3
World Blitz 2023 – Round 9.64 – Kakabayev, Mergen – 0-1 – Demchenko, Aleksandr – G546 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 Ng6 6. d4 exd4 7. cxd4 Bb4+ 8. Nc3 d5 9. e5 O-O 10. h3 f6
World Rapid Final 2012 – Round 12 – Ismagambetov, Anuar – 0-1 – Grischuk, Alexander – G91 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 5. c3 g6 6. d4 exd4 7. cxd4 Bg7 8. d5 b5 9. dxc6 bxa4 10. Qxa4 Nxc6

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