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- 6.e4 (not 6...c5), D30-D39 1. d4 d5 2. c4 e6 Queen's gambit declined, D39 - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4 5. Bg5 dxc4 - Queen's Gambit Declined: Ragozin Defense, Vienna Variation, SÉRIE D
83. Tata Steel Masters 2021 – Round 12.3 – Caruana, Fabiano – 1/2-1/2 – Anton Guijarro, David – G83

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- 1. c4 e6 2. g3 d5 3. Bg2 ..., A10-A39 English Opening, A13 - 1. c4 e6 - English Opening: Agincourt Defense, A13 - 1. c4 e6 2. Nf3 d5 - English Opening: Agincourt Defense, A13 - 1. c4 e6 2. Nf3 d5 3. g3 Nf6 - English Opening: Neo-Catalan, A13 - 1. c4 e6 2. Nf3 Nf6 3. g3 d5 4. Bg2 dxc4 - English Opening: Agincourt Defense, Catalan Defense Accepted, A13 - 1. Nf3 d5 2. c4 e6 3. g3 - English Opening: Agincourt Defense, A13 - 1. Nf3 Nf6 2. c4 e6 3. g3 d5 4. Bg2 - English Opening: Neo-Catalan, SÉRIE A
83. Tata Steel Masters 2021 – Round 13.2 – Donchenko, Alexander – 0-1 – Esipenko, Andrey – G89

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- 7.Ba3 (not 7...c6, 7...c5, 7...O-O, 8.Be2, 8.Be3, 8.Qd2, 8.Rb1), 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
83. Tata Steel Masters 2021 – Round 13.3 – Carlsen, Magnus – 1-0 – Vachier-Lagrave, Maxime – G90

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- (not 8.O-O), 6...Bd6 7.Qc2 O-O — Main Line, D43-D49 Queen's Gambit Declined semi-Slav1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6, D46 - 5. e3 Nbd7 6. Bd3 - Semi-Slav Defense: Main Line (not 6.... dxc4), SÉRIE D
83. Tata Steel Masters 2021 – Round 13.7 – Duda, Jacob – 1/2-1/2 – Harikrishna, Pentala – G94

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