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- 7...c5 8.Qd2 Qa5 — Exchange, 9.Rc1, D80-D99 Gruenfeld defence1. d4 Nf6 2. c4 g6 3. Nc3 d5, D85 - 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 - Grünfeld Defense: Exchange Variation, Modern Exchange Variation, D85 - 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5- Grünfeld Defense, SÉRIE D
63. ch-USA 2019 – Round 3.1 – Akobian, Varuzhan – 1/2-1/2 – So, Wesley – G13

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- A10-A39 English Opening, A28 - 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d3 - English Opening: King's English Variation, Four Knights Variation, Flexible Line, A28 - 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4.... - English Opening, SÉRIE A
63. ch-USA 2019 – Round 3.2 – Nakamura, Hikaru – 1-0 – Sevian, Samuel – G14

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- 6.O-O O-O — Main Line, 7.Qc2 a6 8.Qxc4 b5 9.Qc2 Bb7 10.Bd2 Be4, 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
63. ch-USA 2019 – Round 4.2 – Caruana, Fabiano – 1/2-1/2 – Dominguez Perez, Leinier – G20

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- 5.d4 exd4, 6.e5 Ne4 7.Bd5 Nxf2 8.Kxf2 dxc3+ 9.Kg3, C50-C59 1. e4 e5 2. Nf3 Nc6 3. Bc4 Italian Game, C54 - 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 - Italian Game: Classical Variation, Giuoco Pianissimo, SÉRIE C
63. ch-USA 2019 – Round 4.4 – Liang, Awonder – 1/2-1/2 – Nakamura, Hikaru – G22

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- 5.Bf4 O-O, 6.e3 Nbd7, D30-D39 1. d4 d5 2. c4 e6 Queen's gambit declined, D37 - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 - Queen's Gambit Declined: Three Knights Variation, D37 - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Nbd7 - Queen's Gambit Declined: Barmen Variation, SÉRIE D
63. ch-USA 2019 – Round 4.5 – Lenderman, Aleksandr – 1/2-1/2 – Akobian, Varuzhan – G23

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- 5.d4 Nd6, 6.Bxc6 dxc6 7.dxe5 Nf5 8.Qxd8+, C60-C69 1. e4 e5 2. Nf3 Nc6 3. Bb5 Ruy Lopez (Spanish opening), C67 - 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 - Ruy Lopez: Berlin Defense, Rio Gambit Accepted, SÉRIE C
63. ch-USA 2019 – Round 4.6 – Sevian, Samuel – 1/2-1/2 – Gareyev, Timur – G24

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