| Torres Rebolledo, Alvaro2322 | 1-0 | Costa, Francisco Passos1954 | World Youth Open U14 2026 | 2026 |
| Costa, Francisco Passos1954 | 1-0 | Tay, Mason1749 | World Youth Open U14 2026 | 2026 |
| Warren, Julian | 0-1 | Costa, Francisco Passos1954 | World Youth Open U14 2026 | 2026 |
| Costa, Francisco Passos1954 | ½-½ | Vozhzhov, Leonard1618 | World Youth Open U14 2026 | 2026 |
| Belen, James Matthew1612 | 1-0 | Costa, Francisco Passos1954 | World Youth Open U14 2026 | 2026 |
| Costa, Francisco Passos1954 | 0-1 | Ivarlac, Vladislav2096 | World Youth Open U14 2026 | 2026 |
| Ragavan, Samarth Rajesh2148 | 1-0 | Costa, Francisco Passos1954 | World Youth Open U14 2026 | 2026 |
| Costa, Francisco Passos1954 | ½-½ | Vyas, Miransh Purven2109 | World Youth Open U14 2026 | 2026 |
| Xhelaj, Roel | 0-1 | Costa, Francisco Passos1954 | World Youth Open U14 2026 | 2026 |
| Costa, Francisco Passos1954 | 1-0 | Mintz, Nathan1665 | World Youth Open U14 2026 | 2026 |
| Ambartsumian, Tyhran2398 | 1-0 | Costa, Francisco Passos1954 | World Youth Open U14 2026 | 2026 |
| Costa, Francisco Passos1801 | 0-1 | Greau Carreno, Rodrigo Alberto1961 | Brazil Chess - Floripa | 2026 |
| Costa, Francisco Passos1801 | ½-½ | Horota, Edson Kazumi De Oliveira | Brazil Chess - Floripa | 2026 |
| Yokomizo, Wilton1620 | 0-1 | Costa, Francisco Passos1801 | Brazil Chess - Floripa | 2026 |
| Costa, Francisco Passos1801 | ½-½ | E Silva, Bernardo Caio C1654 | Brazil Chess - Floripa | 2026 |