7 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Ong, Jonathan Si Seng | Peramunetilleke, Savin | 0-1 | C47 | 2026 Australian Championship Under 18 years | 2026-01-18 |
| Ong, Jonathan Si Seng | Ng, Clive | 0-1 | B33 | Round 9: Ong, Jonathan Si Seng - Ng, Clive | 2024-07-10 |
| Ong, Jonathan Si Seng | Smirnov, Anton | 0-1 | B00 | 2025 Sydney International Open Blitz |