| Dec 22, 2023 | Ernesto J. Fernandez Guillen | 0–1 | Chithambaram Vr. Aravindh | Round 15: Ernesto J. Fernandez Guillen - Chithambaram Vr. Aravindh | French Defense: Two Knights Variation | |
| Dec 22, 2023 | Chithambaram Vr. Aravindh | 1–0 | Ernesto J. Fernandez Guillen | Round 14: Ernesto J. Fernandez Guillen - Chithambaram Vr. Aravindh | Nimzo-Larsen Attack: Indian Variation | |
| Dec 22, 2023 | Brandon Jacobson | 1–0 | Ernesto J. Fernandez Guillen | Round 12: Brandon Jacobson - Ernesto J. Fernandez Guillen | King's Indian Defense: Orthodox Variation, Bayonet Attack | |
| Dec 22, 2023 | Ernesto J. Fernandez Guillen | 0–1 | Brandon Jacobson | Round 11: Ernesto J. Fernandez Guillen - Brandon Jacobson | King's Gambit Accepted: Abbazia Defense | |
| Dec 22, 2023 | Volodymyr Vetoshko | 0–1 | Ernesto J. Fernandez Guillen | Round 10: Volodymyr Vetoshko - Ernesto J. Fernandez Guillen | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Dec 21, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Kirill Alekseenko | Round 9: Ernesto J. Fernandez Guillen - Kirill Alekseenko | Sicilian Defense: Najdorf Variation, Lipnitsky Attack | |
| Dec 20, 2023 | Alexander Domene Mulyukov | 0–1 | Ernesto J. Fernandez Guillen | Round 8: Alexander Domene Mulyukov - Ernesto J. Fernandez Guillen | Sicilian Defense: Chekhover Variation | |
| Dec 19, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Bashiq Imrose Md | Round 7: Ernesto J. Fernandez Guillen - Bashiq Imrose Md | Caro-Kann Defense: Advance Variation | |
| Dec 18, 2023 | Volodar Murzin | 1–0 | Ernesto J. Fernandez Guillen | Round 6: Volodar Murzin - Ernesto J. Fernandez Guillen | Indian Defense: London System | |
| Dec 16, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Shubh Jayesh Laddha | Round 5: Ernesto J. Fernandez Guillen - Shubh Jayesh Laddha | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Dec 15, 2023 | Dominik Horvath | 1–0 | Ernesto J. Fernandez Guillen | Round 4: Dominik Horvath - Ernesto J. Fernandez Guillen | Italian Game: Classical Variation, Greco Gambit, Traditional Line | |
| Dec 14, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Thota Dhruva | Round 3: Ernesto J. Fernandez Guillen - Thota Dhruva | Zukertort Opening: Nimzo-Larsen Variation | |
| Dec 13, 2023 | Vishwa Shah | 0–1 | Ernesto J. Fernandez Guillen | Round 2: Vishwa Shah - Ernesto J. Fernandez Guillen | Ruy Lopez: Schliemann Defense | |
| Dec 13, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Abdumajid Botiraliev | Round 1: Ernesto J. Fernandez Guillen - Abdumajid Botiraliev | King's Indian Attack | |
| Dec 9, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Leo Valle Luis | Round 9: Ernesto J. Fernandez Guillen - Leo Valle Luis | Caro-Kann Defense: Advance Variation | |
| Dec 9, 2023 | Cristobal Henriquez Villagra | 1–0 | Ernesto J. Fernandez Guillen | Round 8: Cristobal Henriquez Villagra - Ernesto J. Fernandez Guillen | King's Indian Defense: Smyslov Variation | |
| Dec 9, 2023 | Tomas Sosa | 1–0 | Ernesto J. Fernandez Guillen | Round 7: Tomas Sosa - Ernesto J. Fernandez Guillen | Sicilian Defense: O'Kelly Variation, Venice System, Steiner Line | |
| Dec 9, 2023 | Ernesto J. Fernandez Guillen | ½–½ | Alexei Shirov | Round 6: Ernesto J. Fernandez Guillen - Alexei Shirov | King's Gambit Accepted: Bishop's Gambit, Bledow Countergambit | |
| Dec 9, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Marc Narciso Dublan | Round 5: Ernesto J. Fernandez Guillen - Marc Narciso Dublan | Pirc Defense: Byrne Variation | |
| Dec 9, 2023 | Filemon Cruz | 0–1 | Ernesto J. Fernandez Guillen | Round 4: Filemon Cruz - Ernesto J. Fernandez Guillen | English Opening: Anglo-Indian Defense, Queen's Indian Formation | |
| Dec 9, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Michael A Rahal | Round 3: Ernesto J. Fernandez Guillen - Michael A Rahal | French Defense: Two Knights Variation | |
| Jul 16, 2023 | Ernesto J. Fernandez Guillen | 0–1 | Baadur Jobava | Round 9: Ernesto J. Fernandez Guillen - Baadur Jobava | Caro-Kann Defense: Advance Variation, Short Variation | |
| Jul 15, 2023 | Hannes Stefansson | 0–1 | Ernesto J. Fernandez Guillen | Round 8: Hannes Stefansson - Ernesto J. Fernandez Guillen | Ruy Lopez: Schliemann Defense | |
| Jul 14, 2023 | Radoslaw Barski | 0–1 | Ernesto J. Fernandez Guillen | Round 7: Jacques Elbilia - Julen Luis Arizmendi Martinez | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Jul 13, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Jaime Rey Martinez | Round 6: Ernesto J. Fernandez Guillen - Jaime Rey Martinez | Sicilian Defense: O'Kelly Variation | |
| Jul 12, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Aaron Bendayan Claros | Round 5: Ernesto J. Fernandez Guillen - Aaron Bendayan Claros | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Jul 9, 2023 | Kavin Venkatesan | 1–0 | Ernesto J. Fernandez Guillen | Round 2: Kavin Venkatesan - Ernesto J. Fernandez Guillen | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jul 8, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Leandro Cortes Fernandez | Round 1: Ernesto J. Fernandez Guillen - Leandro Cortes Fernandez | Modern Defense: Standard Defense | |
| May 7, 2023 | Filemon Cruz | 0–1 | Ernesto J. Fernandez Guillen | Round 9: Filemon Cruz - Ernesto J. Fernandez Guillen | English Opening: King's English Variation | |
| May 7, 2023 | Ernesto J. Fernandez Guillen | 0–1 | Tomas Sosa | Round 6: Ernesto J. Fernandez Guillen - Tomas Sosa | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| May 7, 2023 | Olexiy Bilych | ½–½ | Ernesto J. Fernandez Guillen | Round 5: Olexiy Bilych - Ernesto J. Fernandez Guillen | King's Indian Defense: Semi-Averbakh System | |
| May 7, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Jose Antonio Lacasa Diaz | Round 4: Ernesto J. Fernandez Guillen - Jose Antonio Lacasa Diaz | Sicilian Defense: Dragon Variation | |
| Apr 10, 2023 | Yi Xu | 1–0 | Ernesto J. Fernandez Guillen | Ronda 9: Yi Xu - Ernesto J. Fernandez Guillen | Three Knights Opening | |
| Apr 9, 2023 | Ernesto J. Fernandez Guillen | ½–½ | Tomas Sosa | Ronda 8: Ernesto J. Fernandez Guillen - Tomas Sosa | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Apr 9, 2023 | Ernesto J. Fernandez Guillen | ½–½ | Leon Luke Mendonca | Ronda 7: Ernesto J. Fernandez Guillen - Leon Luke Mendonca | King's Indian Attack: Yugoslav Variation | |
| Apr 8, 2023 | Evgeny Postny | ½–½ | Ernesto J. Fernandez Guillen | Ronda 6: Evgeny Postny - Ernesto J. Fernandez Guillen | Queen's Indian Defense: Capablanca Variation | |
| Apr 7, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Sabrina Vega Gutierrez | Ronda 5: Ernesto J. Fernandez Guillen - Sabrina Vega Gutierrez | Sicilian Defense: French Variation | |
| Apr 7, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Mauricio Vassallo Barroche | Ronda 4: Ernesto J. Fernandez Guillen - Mauricio Vassallo Barroche | Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation | |
| Apr 6, 2023 | Jose Remolar Gallen | 0–1 | Ernesto J. Fernandez Guillen | Ronda 3: Jose Remolar Gallen - Ernesto J. Fernandez Guillen | Nimzo-Indian Defense: Simagin Variation | |
| Apr 6, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Alvaro Torres Rebolledo | Ronda 2: Ernesto J. Fernandez Guillen - Alvaro Torres Rebolledo | Zukertort Opening: Reversed Grünfeld | |
| Jan 21, 2023 | Alberto Quintin Navarro | ½–½ | Ernesto J. Fernandez Guillen | Round 9: Alberto Quintin Navarro - Ernesto J. Fernandez Guillen | Queen's Indian Defense: Classical Variation, Traditional Variation | |
| Jan 20, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Cristhian Camilo Rios | Round 8: Ernesto J. Fernandez Guillen - Cristhian Camilo Rios | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jan 19, 2023 | Gabriel Flom | ½–½ | Ernesto J. Fernandez Guillen | Round 7: Gabriel Flom - Ernesto J. Fernandez Guillen | Nimzo-Indian Defense: Sämisch Variation | |
| Jan 18, 2023 | Ernesto J. Fernandez Guillen | ½–½ | Vignesh N R | Round 6: Ernesto J. Fernandez Guillen - Vignesh N R | Vienna Game: Mieses Variation | |
| Jan 17, 2023 | Ernesto J. Fernandez Guillen | ½–½ | Rodrigo Vasquez Schroeder | Round 5: Ernesto J. Fernandez Guillen - Rodrigo Vasquez Schroeder | Sicilian Defense: Scheveningen Variation, English Attack, with f3 | |
| Jan 16, 2023 | Juan M. Carrasco Martinez | 0–1 | Ernesto J. Fernandez Guillen | Round 4: Juan M. Carrasco Martinez - Ernesto J. Fernandez Guillen | Sicilian Defense: Closed | |
| Jan 15, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Sergio Estremera Panos | Round 3: Ernesto J. Fernandez Guillen - Sergio Estremera Panos | Vienna Game: Frankenstein-Dracula Variation | |
| Jan 14, 2023 | Patrick Van Hoolandt | 0–1 | Ernesto J. Fernandez Guillen | Round 2: Patrick Van Hoolandt - Ernesto J. Fernandez Guillen | Grünfeld Defense: Exchange Variation, Spassky Variation | |
| Jan 13, 2023 | Ernesto J. Fernandez Guillen | 1–0 | Christian Fernando Gutierrez Marconi | Round 1: Ernesto J. Fernandez Guillen - Christian Fernando Gutierrez Marconi | Scotch Game: Scotch Gambit, London Defense | |
| Aug 28, 2022 | Ernesto J. Fernandez Guillen | ½–½ | Emilio Cordova | Round 10: Ernesto J. Fernandez Guillen - Emilio Cordova | Sicilian Defense: Classical Variation, Anti-Sozin Variation | |
| Aug 27, 2022 | Bobby Cheng | ½–½ | Ernesto J. Fernandez Guillen | Round 9: Bobby Cheng - Ernesto J. Fernandez Guillen | Catalan Opening: Closed | |
| Aug 26, 2022 | Ernesto J. Fernandez Guillen | ½–½ | C R G Krishna | Round 8: Ernesto J. Fernandez Guillen - C R G Krishna | French Defense: Two Knights Variation | |
| Aug 25, 2022 | Cristobal Henriquez Villagra (2620) | 0–1 | Ernesto J. Fernandez Guillen | Round 7: Cristobal Henriquez Villagra (2620) - Ernesto J. Fernandez Guillen | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Aug 24, 2022 | Ernesto J. Fernandez Guillen | 1–0 | Maximilian Neef | Round 6: Ernesto J. Fernandez Guillen - Maximilian Neef | French Defense: Two Knights Variation | |
| Aug 23, 2022 | Babu M R Lalith | ½–½ | Ernesto J. Fernandez Guillen | Round 5: Babu M R Lalith - Ernesto J. Fernandez Guillen | Catalan Opening | |
| Aug 22, 2022 | Ernesto J. Fernandez Guillen | 1–0 | Alan Pichot (2641) | Round 4: Ernesto J. Fernandez Guillen - Alan Pichot (2641) | Sicilian Defense: Sozin Attack, Flank Variation | |
| Aug 21, 2022 | Fernando Peralta | ½–½ | Ernesto J. Fernandez Guillen | Round 3: Fernando Peralta - Ernesto J. Fernandez Guillen | Nimzo-Indian Defense: Rubinstein System | |