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- C60-C69 1. e4 e5 2. Nf3 Nc6 3. Bb5 Ruy Lopez (Spanish), C67 - 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 - Ruy Lopez: Berlin Defense, Rio Gambit Accepted, C67n - 6.dxe5 - Open Berlin Defense, l'Hermet Variation (1900), SÉRIE C
63. ch-USA 2019 – Round 4.1 – Xiong, Jeffery – 0-1 – Robson, Ray – G19
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- 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, E05t - 10…Be4 - Open, Classical (1982), SÉRIE E
63. ch-USA 2019 – Round 4.2 – Caruana, Fabiano – 1/2-1/2 – Dominguez Perez, Leinier – G20
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