| Apr 21, 2024 | Costa | 0–1 | Olmos | Round 4: Costa, Milagros - Olmos, Ciro | Sicilian Defense: Dragon Variation | |
| Apr 21, 2024 | Costa | 0–1 | Caballero | Round 3: Costa, Milagros - Caballero, Tabare | French Defense: Exchange Variation | |
| Mar 30, 2024 | Altesor | 1–0 | Costa | Round 7: Altesor, Caterina - Costa, Milagros | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Mar 29, 2024 | Costa | ½–½ | Quevedo | Round 6: Costa, Milagros - Quevedo, Andreina | Philidor Defense: Lion Variation | |
| Mar 28, 2024 | Fabra | 1–0 | Costa | Round 5: Fabra, Nahiara - Costa, Milagros | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Mar 27, 2024 | Costa | 1–0 | Silva Rosas | Round 4: Costa, Milagros - Silva Rosas, Natalia | Caro-Kann Defense | |
| Mar 26, 2024 | Alves | 0–1 | Costa | Round 3: Alves, Anaclara - Costa, Milagros | English Opening: King's English Variation, Two Knights Variation, Keres Variation | |
| Mar 25, 2024 | Costa | 0–1 | Roepke | Round 2: Costa, Milagros - Roepke, Sofia | Italian Game: Paris Defense | |
| Mar 24, 2024 | Cardozo | 1–0 | Costa | Round 1: Cardozo, Camila - Costa, Milagros | Indian Defense: London System | |
| Dec 8, 2024 | Gonzabay Vidal | 1–0 | Costa | Round 9: Gonzabay Vidal, Evelyn Xiomara - Costa, Milagros | Nimzo-Larsen Attack: Indian Variation | |
| Dec 7, 2024 | Costa | 0–1 | Mollo Figueroa | Round 7: Costa, Milagros - Mollo Figueroa, Nicole | French Defense: Exchange Variation, Monte Carlo Variation | |
| Dec 5, 2024 | Costa | 0–1 | Mereles Samaniego | Round 5: Costa, Milagros - Mereles Samaniego, Mia Aylin | Sicilian Defense: Hyperaccelerated Dragon | |
| Dec 5, 2024 | Morales Perez | 1–0 | Costa | Round 6: Morales Perez, Ghisell - Costa, Milagros | Italian Game: Classical Variation, Giuoco Pianissimo, with h6 | |
| Dec 4, 2024 | Costa | 0–1 | Ascencio Salazar | Round 3: Costa, Milagros - Ascencio Salazar, Elena | Sicilian Defense: French Variation | |
| Dec 4, 2024 | Ramazzotte | 1–0 | Costa | Round 4: Ramazzotte, Esther Zilli - Costa, Milagros | Nimzo-Indian Defense | |
| Dec 3, 2024 | Costa | 0–1 | Vergara Perez | Round 1: Costa, Milagros - Vergara Perez, Marcela Sophia | Sicilian Defense: Kan Variation, Knight Variation | |
| Dec 3, 2024 | Smeets | 0–1 | Costa | Round 2: Smeets, Daphne - Costa, Milagros | Four Knights Game: Scotch Variation Accepted | |
| — | Costa | 1–0 | Jaedyn C.R.Pierre | Round 2: Costa, Milagros - Jaedyn C.R.Pierre | Caro-Kann Defense: Exchange Variation | |
| — | Costa | 0–1 | Xu | Round 4: Costa, Milagros - Xu, Luna Yuexiu | Sicilian Defense: Najdorf Variation, Zagreb Variation | |
| — | Costa | 1–0 | Gradiz Menjivar | Round 5: Costa, Milagros - Gradiz Menjivar, Oscar | French Defense: Exchange Variation, Monte Carlo Variation | |
| — | Costa | 0–1 | Grisales Gamez | FIDE World Youth U16 Chess Olympiad 2025 | Indian Defense: Colle System, King's Indian Variation | |
| — | Costa | 0–1 | Cupaban Alonso | Round 8: Costa, Milagros - Cupaban Alonso, Luciana | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| — | Viti | 1–0 | Costa | Round 3: Viti, Greta - Costa, Milagros | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| — | Fernandez Noriega | 1–0 | Costa | Round 6: Fernandez Noriega, Shayra Maria - Costa, Milagros | Italian Game: Classical Variation, Giuoco Pianissimo | |
| — | Lopez Mass | ½–½ | Costa | Round 7: Lopez Mass, Maria Fernanda - Costa, Milagros | Indian Defense | |
| — | Barreto Pulido | 0–1 | Costa | Round 9: Barreto Pulido, Mariana - Costa, Milagros | Ruy Lopez: Steinitz Defense | |
