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- 4.d4 exd4 — Main Line, 5.Nxd4 Bb4 6.Nxc6 bxc6 7.Bd3 d5 8.exd5 cxd5 9.O-O O-O — Main Line, C40-C49 King's knight opening, C47 - 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 - Four Knights Game, C47 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. ....Four knights, Scotch variation, SÉRIE C
8. Sinquefield Cup 2021 – Round 3.4 – Xiong, Jeffery – 1/2-1/2 – Dominguez Perez, Leinier – G14

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- 7...h6 8.Bh4 Qb6, B20 - B99 - 1. e4 c5 - Sicilian Defense, B90-B99 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 Sicilian, Najdorf, B96 - 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 - Sicilian Defense: Najdorf Variation, B96 - 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
8. Sinquefield Cup 2021 – Round 4.1 – Swiercz, Dariusz – 1-0 – Xiong, Jeffery – G16

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- 7.Nb3 Ne5, A10-A39 English Opening, A33 - 1. c4 e6 2. Nf3 Nf6 3. Nc3 c5 4. d4 Nc6 5. g3 cxd4 6. Nxd4 Qb6 - English Opening: Symmetrical Variation, Anti-Benoni Variation, Geller Variation, A33 - 1. c4 e6 2. Nf3 Nf6 3. Nc3 c5 4.... - English Opening, SÉRIE A
8. Sinquefield Cup 2021 – Round 4.2 – Caruana, Fabiano – 1/2-1/2 – So, Wesley – G17

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- B20 - B99 - 1. e4 c5 - Sicilian Defense, B90 - 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 - Sicilian Defense: Najdorf Variation, B90 - 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 - Sicilian Defense: Najdorf Variation, English Attack, B90 - 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4.... - Sicilian Defense, B90-B99 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 Sicilian, Najdorf, SÉRIE B 1.e4 2....
8. Sinquefield Cup 2021 – Round 4.5 – Dominguez Perez, Leinier – 1-0 – Vachier-Lagrave, Maxime – G20

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- 7.a3, D20-D29 1. d4 d5 2. c4 dxc4 Queen's gambit accepted, D27 - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 - Queen's Gambit Accepted: Classical Defense, Main Line, SÉRIE D
8. Sinquefield Cup 2021 – Round 5.3 – Mamedyarov, Shakhriyar – 1/2-1/2 – Dominguez Perez, Leinier – G23

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