Ong, Williamson
Current rating: 1524
| Grand Prix Manila 2010 (ROE standard) | starting rating: 1524 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 398 | Mencias, Ryan (1500) | Won 2-1 | +171541 |
| 2standard | 63 | Tolentino, Jonee (1518) | Lost 1-2 | -181523 |
| 3standard | 172 | Daracan, Jeffrey Allen (1499) | Lost 0-1 | -191504 |
| 4standard | 325 | Chao, Peter (1555) | Won 2-1 | +191523 |
| 5standard | 350 | Trinidad, Jason (1501) | Won 2-0 | +181541 |
| 6standard | 236 | Meneses, Kenneth (1519) | Won 2-0 | +181559 |
| 7standard | 126 | Jaro, Ogie (1668) | Lost 1-2 | -161543 |
| 8standard | 158 | Balais, Jay (1519) | Lost 0-2 | -191524 |
| top | average opponent: 1535record: 4-4 | new rating: 1524 | ||
| Grand Prix Manila 2008 (Lorwyn block) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 62 | Asehan, Ceasar John (1558) | Won 2-0 | +191522 |
| 3block | 42 | David, Voncer (1536) | Won 2-0 | +181540 |
| 4block | 17 | Santiago, Rainier (1537) | Lost 0-2 | -181522 |
| 5block | 105 | Romero, Alexander David (1535) | Won 2-0 | +181540 |
| 6block | 41 | Tan, Lloyd Ryan (1589) | Lost 0-2 | -171523 |
| 7block | 59 | De Leon, Marco (1554) | Draw 1-1 | +11524 |
| top | average opponent: 1552record: 3-2-1 | new rating: 1524 | ||
| Grand Prix Manila 2006 (GPT limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 12 | Monteclaro, Norman L. (1518) | Won 2-0 | +181518 |
| 3sealed | 16 | Espano, Ryan (1536) | Lost 0-2 | -171501 |
| 4sealed | 62 | Villar, Ivan Louie (1518) | Won 2-0 | +181519 |
| 5sealed | 36 | Piechnick, Daniel (1582) | Lost 0-2 | -171502 |
| 6sealed | 86 | Igarta, Jeffrey (1518) | Won 2-1 | +181520 |
| 7sealed | 43 | Bibat, Bryan Jay (1543) | Lost 1-2 | -171503 |
| top | average opponent: 1536record: 3-3 | new rating: 1503 | ||