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- 4.d4 exd4 — Main Line, 5.Nxd4 Bb4 6.Nxc6 bxc6 7.Bd3 d5 8.exd5 cxd5 — 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
Saint Louis Blitz 2019 – Round 13.5 – Karjakin, Sergey – 1-0 – Rapport, Richard – G65

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- 6...h6 7.Bh4 (not 7...b6), D50-D69 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Queen's Gambit Declined, 4.Bg5, D54 - 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 O-O 6. Rc1 - Queen's Gambit Declined: Neo-Orthodox Variation, SÉRIE D
Saint Louis Blitz 2019 – Round 14.2 – Rapport, Richard – 1-0 – Dominguez Perez, Leinier – G67

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- 6.O-O O-O — Main Line, 7.Qc2 a6 8.a4, E01-E09 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Catalan, closed, E05 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Be7 - Catalan Opening: Open Defense, Classical Line, SÉRIE E
Saint Louis Blitz 2019 – Round 15.1 – Aronian, Levon – 1/2-1/2 – Dominguez Perez, Leinier – G71

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- 6.O-O O-O, 7.d5 exd5, E12-E19 1. d4 Nf6 2. c4 e6 3. Nf3 b6 Queen's Indian defence, E17 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 - Queen's Indian Defense: Traditional Variation, SÉRIE E
Saint Louis Blitz 2019 – Round 15.2 – Mamedyarov, Shakhriyar – 1-0 – Rapport, Richard – G72

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