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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
Smyslov Region Group Cup 2021 – Round 12.7 – Paravyan, David – 1-0 – Esipenko, Andrey – G128

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- 6.Be3 c5, 7.Nge2 Nc6 8.d5, E60-E99 1. d4 Nf6 2. c4 g6 King's Indian defence, E81 - 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O - King's Indian Defense: Sämisch Variation, Normal Defense, SÉRIE E
Smyslov Region Group Cup 2021 – Round 12.8 – Ponkratov, Pavel – 1-0 – Lagno, Kateryna – G129

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- A10-A39 English Opening, A14 - 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Be7 5. O-O - English Opening: Agincourt Defense, Neo-Catalan Declined, A14 - 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4.... - English Opening, SÉRIE A
Smyslov Region Group Cup 2021 – Round 12.9 – Chigaev, Maksim – 1-0 – Predke, Alexandr – G130

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- 5.Re1 Nd6 6.Nxe5, 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
Smyslov Region Group Cup 2021 – Round 13.1 – Nepomniachtchi, Ian – 1/2-1/2 – Grischuk, Alexander – G131

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- 5.e3 b5, 6.b3, D10-D19 1. d4 d5 2. c4 c6 Queen's Gambit Slav defence, D15 - 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 - Slav Defense: Three Knights Variation, D15 - 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6 - Slav Defense: Chebanenko Variation, SÉRIE D
Smyslov Region Group Cup 2021 – Round 13.11 – Potkin, Vladimir – 1-0 – Karjakin, Sergey – G133

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- B20 - B99 - 1. e4 c5 - Sicilian Defense, B30 - 1. e4 c5 2. Nf3 Nc6 - Sicilian Defense: Old Sicilian, B30 - 1. e4 c5 2. Nf3 Nc6 3. Nc3 e5 4. Bc4 Be7 5. d3 d6 - Sicilian Defense: Closed, Anti-Sveshnikov Variation, with d6, B30 - 1. e4 c5 2. Nf3 Nc6 3. Nc3 e5 4.... - Sicilian Defense, B30 - B39 1.e4 c5 2. Nf3 Nc6 Sicilian defence, SÉRIE B 1.e4 2....
Smyslov Region Group Cup 2021 – Round 13.2 – Fedoseev, Vladimir – 1-0 – Sjugirov, Sanan – G134

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