| Apr 11, 2026 | Moussard | 1–0 | Fernandez Guillen | Round 8: Moussard, Jules - Fernandez Guillen, Ernesto J. | Ruy Lopez: Schliemann Defense, Tartakower Variation | |
| Apr 9, 2026 | Fernandez Guillen | 0–1 | Li | Round 5: Fernandez Guillen, Ernesto J. - Li, Di | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Apr 8, 2026 | Ermachenko | ½–½ | Fernandez Guillen | Round 3: Ermachenko, Manuel - Fernandez Guillen, Ernesto J. | Scotch Game: Schmidt Variation | |
| Apr 4, 2026 | Popovic | 1–0 | Fernandez Guillen | Round 9: Popovic, Milan S - Fernandez Guillen, Ernesto J. | Italian Game | |
| Apr 4, 2026 | Fernandez Guillen | 1–0 | Bressac | Round 8: Fernandez Guillen, Ernesto J. - Bressac, Stephane | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Apr 4, 2026 | Pomes Marcet | 0–1 | Fernandez Guillen | Round 7: Pomes Marcet, Joan - Fernandez Guillen, Ernesto J. | Nimzo-Indian Defense: Simagin Variation | |
| Apr 3, 2026 | Fernandez Guillen | * | Fernandez Lago | Round 6: Fernandez Guillen, Ernesto J. - Fernandez Lago, David | ? | |
| Apr 2, 2026 | Fernandez Guillen | * | Sanjuan Garcia | Round 5: Fernandez Guillen, Ernesto J. - Sanjuan Garcia, Miguel | ? | |
| Apr 1, 2026 | Bermejo Martinez | 1–0 | Fernandez Guillen | Round 4: Bermejo Martinez, Jorge - Fernandez Guillen, Ernesto J. | Grünfeld Defense: Russian Variation, Szabo Variation | |
| Apr 1, 2026 | Fernandez Guillen | 1–0 | Ivana Maria | Round 2: Fernandez Guillen, Ernesto J. - Ivana Maria, Furtado | King's Indian Attack | |
| Apr 1, 2026 | Sharifov | 1–0 | Fernandez Guillen | Round 3: Sharifov, Mekhriddin - Fernandez Guillen, Ernesto J. | English Opening: Anglo-Indian Defense, Slav Formation | |
| Mar 31, 2026 | Herrero Pena | 0–1 | Fernandez Guillen | Round 1: Herrero Pena, Laura - Fernandez Guillen, Ernesto J. | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Mar 21, 2026 | Fernandez Guillen | 0–1 | Bogdanov | Ronda 10 Mollet Vs Barberà: Fernandez Guillen, Ernesto J. - Bogdanov, Artyom | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Mar 14, 2026 | Fernandez Guillen | ½–½ | Ruiz Buendia | Ronda 9 Tres Peons Vs Mollet: Fernandez Guillen, Ernesto J. - Ruiz Buendia, Miguel | Zukertort Opening: Sicilian Invitation | |
| Feb 21, 2026 | Rahal Vives | ½–½ | Fernandez Guillen | Ronda 6 Ateneu Colon Vs Mollet: Rahal Vives, Michael Anthony - Fernandez Guillen, Ernesto J. | Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack | |
| Jan 24, 2026 | Radovanovic | ½–½ | Fernandez Guillen | Lira Vendrellenca Vs Mollet | Four Knights Game: Spanish Variation, Double Spanish | |
| Dec 21, 2025 | Pranav K P | 1–0 | Fernandez Guillen | Sunway Sitges 2025 | Modern Defense | |
| Dec 19, 2025 | Sarveshwaran V | ½–½ | Fernandez Guillen | Sunway Sitges 2025 | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Dec 19, 2025 | Fernandez Guillen | 1–0 | Asensio Linan | Sunway Sitges 2025 | King's Indian Attack: Symmetrical Defense | |
| Dec 4, 2025 | Marin | 0–1 | Fernandez Guillen | XXII Torneo Internacional Gran Hotel Bali Grupo A | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Dec 3, 2025 | Fernandez Guillen | ½–½ | Mosesov | XXII Torneo Internacional Gran Hotel Bali Grupo A | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Dec 3, 2025 | Del Rio De Angelis | 0–1 | Fernandez Guillen | XXII Torneo Internacional Gran Hotel Bali Grupo A | Yusupov-Rubinstein System | |
| Dec 2, 2025 | Fernandez Guillen | ½–½ | Assylov | XXII Torneo Internacional Gran Hotel Bali Grupo A | Sicilian Defense: Sozin Attack, Leonhardt Variation | |
| Nov 30, 2025 | Garcia | 0–1 | Fernandez Guillen | XXII Torneo Internacional Gran Hotel Bali Grupo A | English Opening: Anglo-Indian Defense, Queen's Indian Formation | |
| Nov 30, 2025 | Fernandez Guillen | 1–0 | Shah Jeet | XXII Torneo Internacional Gran Hotel Bali Grupo A | King's Indian Attack: Sicilian Variation | |
| Nov 29, 2025 | Manukyan | 1–0 | Fernandez Guillen | XXII Torneo Internacional Gran Hotel Bali Grupo A | Queen's Gambit Declined | |
| Nov 28, 2025 | Fernandez Guillen | 1–0 | Olsson | XXII Torneo Internacional Gran Hotel Bali Grupo A | Scotch Game: Scotch Gambit, Kingside Variation | |
| Nov 28, 2025 | Alvarez Morales | 0–1 | Fernandez Guillen | XXII Torneo Internacional Gran Hotel Bali Grupo A | English Opening: Symmetrical Variation, Fianchetto Variation | |
| Jul 31, 2025 | Serrano Almendros | ½–½ | Fernandez Guillen | Granada Chess Open 25 | Four Knights Game | |
| Jul 31, 2025 | Fernandez Guillen | ½–½ | Roebers | Granada Chess Open 25 | French Defense: Wing Gambit | |
| Jul 30, 2025 | Carrascoso Morales | 0–1 | Fernandez Guillen | Granada Chess Open 25 | Nimzo-Indian Defense: Rubinstein System | |
| Jul 30, 2025 | Fernandez Guillen | 1–0 | Perez Epinin | Granada Chess Open 25 | King's Indian Attack | |
| Jul 29, 2025 | Valenzuela Fernandez | 0–1 | Fernandez Guillen | Granada Chess Open 25 | English Opening: Symmetrical Variation, Fianchetto Variation | |
| Jul 9, 2025 | Fernandez Guillen | ½–½ | Martinez Alcantara | XLIV Open Internacional Villa de Benasque | Petrov's Defense: French Attack | |
| Apr 27, 2025 | Woodward | 1–0 | Fernandez Guillen | Round 9: Woodward, Andy - Fernandez Guillen, Ernesto J. | Catalan Opening: Closed | |
| Apr 26, 2025 | Fernandez Guillen | 1–0 | Pranav | Round 7: Fernandez Guillen, Ernesto J. - Pranav, V | Indian Defense: Knights Variation | |
| Apr 26, 2025 | Fernandez Guillen | ½–½ | Sethuraman | Round 8: Fernandez Guillen, Ernesto J. - Sethuraman, S.P. | Sicilian Defense: Najdorf Variation, Lipnitsky Attack | |
| Apr 24, 2025 | Kostov | * | Fernandez Guillen | Round 4: Kostov, Deyan Samuil - Fernandez Guillen, Ernesto J. | ? | |
| Apr 21, 2025 | Espinosa Aranda | 1–0 | Fernandez Guillen | Semana Santa A. 2025 | Sicilian Defense: Modern Variations | |
| Apr 20, 2025 | Fernandez Guillen | ½–½ | Vetokhin | Semana Santa A. 2025 | Italian Game: Scotch Gambit, Anderssen Attack | |
| Apr 20, 2025 | Fernandez Guillen | 0–1 | Lu | Semana Santa A. 2025 | Sicilian Defense: Najdorf Variation, Lipnitsky Attack | |
| Apr 19, 2025 | Flores Quillas | 0–1 | Fernandez Guillen | Semana Santa A. 2025 | Ruy Lopez: Cozio Defense | |
| Apr 18, 2025 | Fernandez Guillen | 1–0 | Garza Marco | Semana Santa A. 2025 | Sicilian Defense: French Variation, Normal | |
| Apr 18, 2025 | Ladron De Guevara Pinto | ½–½ | Fernandez Guillen | Semana Santa A. 2025 | Sicilian Defense: Accelerated Dragon, Maróczy Bind, Breyer Variation | |
| Apr 17, 2025 | Fernandez Guillen | 1–0 | Martin Duque | Semana Santa A. 2025 | Italian Game: Evans Gambit, Anderssen Variation, Cordel Line | |
| Apr 17, 2025 | Tulliez | 0–1 | Fernandez Guillen | Semana Santa A. 2025 | Sicilian Defense: Hyperaccelerated Fianchetto | |
| Apr 16, 2025 | Fernandez Guillen | 1–0 | Saad | Semana Santa A. 2025 | King's Indian Defense: Fianchetto Variation, Classical Fianchetto | |
| Oct 1, 2024 | Fier | 1–0 | Fernandez Guillen | IBEROAMERICANO | King's Indian Defense: Orthodox Variation, Classical System | |
| Sep 30, 2024 | Fernandez Guillen | ½–½ | Gines Esteo | IBEROAMERICANO | Caro-Kann Defense: Advance Variation | |
| Sep 29, 2024 | Vallejo Pons | 0–1 | Fernandez Guillen | IBEROAMERICANO | Scotch Game: Mieses Variation | |
| Sep 28, 2024 | Fernandez Guillen | 1–0 | Garrido Outon | IBEROAMERICANO | Italian Game: Paris Defense | |
| Sep 27, 2024 | Fernandez Guillen | ½–½ | Ladron De Guevara Pinto | IBEROAMERICANO | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Sep 27, 2024 | Jimenez Garcia | ½–½ | Fernandez Guillen | IBEROAMERICANO | Torre Attack: Classical Defense | |
| Sep 26, 2024 | Domingo Nunez | 0–1 | Fernandez Guillen | IBEROAMERICANO | King's Indian Attack | |
| Sep 25, 2024 | Fernandez Guillen | ½–½ | Vitier Vazquez | IBEROAMERICANO | King's Indian Attack | |
| Sep 25, 2024 | Galvan Cipriani | 0–1 | Fernandez Guillen | IBEROAMERICANO | English Opening: King's English Variation, Botvinnik System | |
| Jul 14, 2024 | Fernandez Guillen | 1–0 | Gorshtein | XLIII Open Villa de Benasque 2024 | Caro-Kann Defense: Advance Variation | |
| Jul 11, 2024 | Fernandez Guillen | 0–1 | Bartel | XLIII Open Villa de Benasque 2024 | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jul 9, 2024 | Fernandez Guillen | 0–1 | Pranav Anand | XLIII Open Villa de Benasque 2024 | Zukertort Opening | |
| Jul 8, 2024 | Yuffa | 0–1 | Fernandez Guillen | XLIII Open Villa de Benasque 2024 | Catalan Opening: Closed | |
| Apr 19, 2024 | Fernandez Guillen | 0–1 | Moussard | Round 10: Fernandez Guillen, Ernesto J. - Moussard, Jules | Italian Game: Giuoco Pianissimo, Normal | |
| Apr 18, 2024 | Alsina Leal | 1–0 | Fernandez Guillen | Round 9: Alsina Leal, Daniel - Fernandez Guillen, Ernesto J. | Sicilian Defense: Moscow Variation | |
| Apr 16, 2024 | Xiao | 1–0 | Fernandez Guillen | Round 7: Xiao, Tong(QD) - Fernandez Guillen, Ernesto J. | Ruy Lopez: Berlin Defense | |
| Apr 15, 2024 | Fernandez Guillen | 1–0 | Dragnev | Round 6: Fernandez Guillen, Ernesto J. - Dragnev, Valentin | Philidor Defense: Lion Variation | |
| Apr 12, 2024 | Ivanchuk | 1–0 | Fernandez Guillen | Round 4: Ivanchuk, Vasyl - Fernandez Guillen, Ernesto J. | Queen's Indian Defense: Fianchetto Variation, Traditional Line | |
| Apr 11, 2024 | Fernandez Guillen | ½–½ | Baklan | Round 3: Fernandez Guillen, Ernesto J. - Baklan, Vladimir | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Apr 10, 2024 | Schulman | 0–1 | Fernandez Guillen | Round 2: Schulman, Julia - Fernandez Guillen, Ernesto J. | Sicilian Defense: O'Kelly Variation, Venice System | |
| Apr 6, 2024 | Fernandez Guillen | 1–0 | Oro | Menorca Open 2024 | Zukertort Opening | |
| Mar 31, 2024 | Zylka | 1–0 | Fernandez Guillen | Round 8: Zylka, Stanislaw - Fernandez Guillen, Ernesto J. | Slav Defense: Czech Variation, Classical System | |
| Mar 28, 2024 | Gkavardinas | 1–0 | Fernandez Guillen | Round 2: Gkavardinas, Antonios - Fernandez Guillen, Ernesto J. | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Mar 27, 2024 | Fernandez Guillen | 1–0 | Martinez Sanchez | Round 1: Fernandez Guillen, Ernesto J. - Martinez Sanchez, Antonio Manuel | French Defense: Winawer Variation, Alekhine Gambit, Kan Variation | |
| Sep 1, 2024 | Banusz | ½–½ | Fernandez Guillen | Round 10: Banusz, Tamas - Fernandez Guillen, Ernesto J. | Indian Defense: London System | |
| Aug 31, 2024 | Fernandez Guillen | 1–0 | Hovakimyan | Round 9: Fernandez Guillen, Ernesto J. - Hovakimyan, Vache | Scotch Game: Mieses Variation | |
| Aug 30, 2024 | Valle Luis | 0–1 | Fernandez Guillen | Round 8: Valle Luis, Leo - Fernandez Guillen, Ernesto J. | Ruy Lopez: Cozio Defense | |
| Aug 29, 2024 | Fernandez Guillen | ½–½ | Zhukov | Round 7: Fernandez Guillen, Ernesto J. - Zhukov, Dmitry | Sicilian Defense: Wing Gambit Deferred | |
| Aug 27, 2024 | Fernandez Guillen | ½–½ | Ochedzan | Round 5: Fernandez Guillen, Ernesto J. - Ochedzan, Tymon | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Aug 25, 2024 | Fernandez Guillen | 0–1 | Hernando Rodrigo | Round 3: Fernandez Guillen, Ernesto J. - Hernando Rodrigo, Julio Antonio | Zukertort Opening | |
| Aug 24, 2024 | Boix Redorta | 0–1 | Fernandez Guillen | Round 2: Boix Redorta, Roc - Fernandez Guillen, Ernesto J. | Sicilian Defense: Accelerated Dragon, Modern Variation | |
| Apr 28, 2023 | Fernandez Guillen | 0–1 | Xu | II CHESSABLE SUNWAY FORMENTERA | Alekhine Defense: Sämisch Attack | |
| Apr 27, 2023 | Jacobson | 0–1 | Fernandez Guillen | II CHESSABLE SUNWAY FORMENTERA | Queen's Indian Defense: Fianchetto Variation, Traditional Line | |
| Apr 26, 2023 | Maisuradze | ½–½ | Fernandez Guillen | II CHESSABLE SUNWAY FORMENTERA | Queen's Indian Defense: Capablanca Variation | |
| Apr 25, 2023 | Fernandez Guillen | ½–½ | Doluhanova | II CHESSABLE SUNWAY FORMENTERA | Italian Game: Giuoco Pianissimo, Normal | |
| Apr 24, 2023 | Jacobson | 1–0 | Fernandez Guillen | II CHESSABLE SUNWAY FORMENTERA | Catalan Opening | |
| Apr 22, 2023 | Fernandez Guillen | 1–0 | Ivanov | II CHESSABLE SUNWAY FORMENTERA | French Defense: Two Knights Variation | |
| Apr 21, 2023 | Pranav | 1–0 | Fernandez Guillen | II CHESSABLE SUNWAY FORMENTERA | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| Apr 20, 2023 | Fernandez Guillen | 1–0 | Liu | Formentera 2023 | French Defense: Tarrasch Variation, Morozevich Variation | |
| Apr 19, 2023 | Aryan | 1–0 | Fernandez Guillen | Formentera 2023 | Sicilian Defense: Najdorf Variation, English Attack | |
| Apr 16, 2023 | Fernandez Guillen | * | Sidhant | Menorca Open | ? | |
| Apr 15, 2023 | Fier | 1–0 | Fernandez Guillen | Menorca Open | Ruy Lopez: Morphy Defense | |
| Apr 15, 2023 | Kalogridis | * | Fernandez Guillen | Menorca Open | ? | |
| Apr 14, 2023 | Fernandez Guillen | 0–1 | Sanal | Menorca Open | Italian Game: Giuoco Pianissimo, Normal | |
| Apr 14, 2023 | Fernandez Guillen | * | Sanal | Menorca Open | ? | |
| Apr 13, 2023 | Fernandez Guillen | 1–0 | Jumabayev | Menorca Open | French Defense: Two Knights Variation | |
| Apr 13, 2023 | Schenderowitsch | * | Fernandez Guillen | Menorca Open | ? | |
| Apr 12, 2023 | Fernandez Guillen | 1–0 | Villiers | Menorca Open | ? | |
| Apr 12, 2023 | De Groote | 1–0 | Fernandez Guillen | Menorca Open | ? | |
| Apr 11, 2023 | Fernandez Guillen | 1–0 | Montesinos Diaz | Menorca Open | ? | |
| Dec 14, 2022 | Yu | 1–0 | Fernandez Guillen | Sunway Sitges | King's Indian Defense: Semi-Averbakh System | |
| Jul 23, 2022 | Manolache | * | Fernandez Guillen | Sevilla Open | East Indian Defense | |
| Jul 22, 2022 | Fernandez Guillen | * | Ramos Del Campo | Sevilla Open | Sicilian Defense: Kan Variation, Modern Variation | |