| 9 feb 2018 | Garcia Serrano, Jose Manuel 1919 | Ver la partida ½-½ | Rojas Pozo, Jose Luis 1952 | B10 Caro-Kann Defense: Two Knights Attack | ronda 4 · mesa 1 |
| 9 feb 2018 | Rodriguez Lopez, David 2044 | Ver la partida 1-0 | Garcia Prados, David 1919 | C00 French Defense: Schlechter Variation | ronda 4 · mesa 2 |
| 9 feb 2018 | Andrade Sandoval, Jim Carlos 1971 | Ver la partida 1-0 | Andrade Sandoval, Bianca 1850 | | ronda 4 · mesa 3 |
| 9 feb 2018 | Gil Sierra, Jacinto 1879 | Ver la partida 0-1 | Cabanas Bravo, Juan Andres 1954 | C64 Ruy Lopez: Classical Variation, Central Variation | ronda 4 · mesa 4 |
| 9 feb 2018 | Corral Aragon, Juan Maria 1852 | Ver la partida 1-0 | Vukotic Jovsic, Dragan 1948 | | ronda 4 · mesa 5 |
| 9 feb 2018 | Anton Quevedo, Andrea 1940 | Ver la partida 1-0 | Marin Aso, Jose Luis 1837 | B48 Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | ronda 4 · mesa 6 |
| 9 feb 2018 | Cano Mercado, Francisco Manuel 1819 | Ver la partida 1-0 | Baeza Escudero, Javier 1884 | | ronda 4 · mesa 7 |
| 9 feb 2018 | Lopez Ziegler, Carlos 1881 | Ver la partida 0-1 | Tirado Parra, Alberto 1804 | B07 Lion Defense | ronda 4 · mesa 8 |
| 9 feb 2018 | Marquez Leon, Juan A. 1740 | Ver la partida 0-1 | Cardena Contreras, Javier 1907 | D32 Tarrasch Defense: Symmetrical Variation | ronda 4 · mesa 9 |
| 9 feb 2018 | Tarrio Ocana, Jose Manuel 1869 | Ver la partida 1-0 | Castro Uceda, Jose Antonio 1622 | B23 Sicilian Defense: Closed | ronda 4 · mesa 10 |
| 9 feb 2018 | Aragon Pena, Andres J. 1813 | Ver la partida ½-½ | Martinez Pascual, Gonzalo 1406 | B17 Caro-Kann Defense: Karpov Variation | ronda 4 · mesa 11 |
| 9 feb 2018 | Pareja Cerrato, Antonio 1533 | Ver la partida 0-1 | Cuellar Gutierrez, Raul 1965 | C01 French Defense: Exchange Variation | ronda 4 · mesa 12 |
| 9 feb 2018 | Parral Puerta, Carlos 1527 | Ver la partida ½-½ | Garcia Guitian, Angel 1816 | E80 King's Indian Defense: Sämisch Variation | ronda 4 · mesa 13 |
| 9 feb 2018 | Jimenez Gonzalez, Marcos 1806 | Ver la partida 1-0 | Santos Rodriguez, Jose 1582 | | ronda 4 · mesa 14 |
| 9 feb 2018 | Amati, Franco | Ver la partida 1-0 | Galarreta Santana, Javier 1619 | | ronda 4 · mesa 15 |
| 9 feb 2018 | Alameda Arellano, Cristeto 1616 | Ver la partida 0-1 | Ortega Sanchez, Carlos | A45 Indian Defense: Accelerated London System | ronda 4 · mesa 16 |
| 9 feb 2018 | Olmos Rodriguez, Arcadio 1391 | Ver la partida 1-0 | Rojas Fernandez, Antonio 1247 | A20 English Opening: King's English Variation | ronda 4 · mesa 17 |
| 9 feb 2018 | Farinas Lucas, Juan Antonio 1548 | Ver la partida 0-1 | Martin Rodriguez, Jose Luis 1300 | C01 French Defense: Exchange Variation, Monte Carlo Variation | ronda 4 · mesa 18 |
| 9 feb 2018 | Sierra Garcia, Ricardo 1380 | Ver la partida 0-1 | Palacios Sanchez, Victor 1387 | B33 Sicilian Defense: Open | ronda 4 · mesa 19 |