David, Herbert
Current rating: 1489
| Grand Prix Manila 2015 (KTK standard) | starting rating: 1509 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 345 | Abdul Rahim, Adnan Faiz (1520) | Won 2-1 | +181527 |
| 2standard | 260 | Tan, Gerald (1500) | Draw 1-1 | 01527 |
| 3standard | 231 | Ramos, Oscar Keene (1518) | Lost 1-2 | -181509 |
| 4standard | 422 | Argie Genosas, Marc (1431) | Draw 1-1 | -21507 |
| 5standard | 486 | De Quiros, Paul Michael (1499) | Lost 0-2 | -181489 |
| top | average opponent: 1494record: 1-2-2 | new rating: 1489 | ||
| Grand Prix Manila 2012 (AVR standard) | starting rating: 1520 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 89 | Lee, Rick Hup Beng (1642) | Won 2-0 | +201540 |
| 4standard | 83 | Alba, Alberto Jr. (1525) | Won 2-1 | +181558 |
| 5standard | 22 | Jen, Chien-Ming (1710) | Lost 1-2 | -161542 |
| 6standard | 111 | De Guzman, Ray (1689) | Lost 0-2 | -151527 |
| 7standard | 128 | Banda, Mark Joseph (1536) | Lost 1-2 | -181509 |
| top | average opponent: 1621record: 2-3 | new rating: 1509 | ||
| Grand Prix Manila 2010 (ROE standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 196 | Fortuno, Christopher A (1500) | Won 2-0 | +181518 |
| 2standard | 4 | Magcalas, Juan Paolo (1518) | Won 2-0 | +181536 |
| 3standard | 51 | Manumbale, Josueh (1536) | Lost 1-2 | -181518 |
| 4standard | 270 | tina, michael (1517) | Won 2-1 | +181536 |
| 5standard | 143 | Dealca, Hezekiah G (1536) | Lost 1-2 | -181518 |
| 6standard | 162 | Salangsang, Jaime Jr (1515) | Won 2-1 | +181536 |
| 7standard | 111 | Aquino, Sherwin (1631) | Lost 0-2 | -161520 |
| top | average opponent: 1536record: 4-3 | new rating: 1520 | ||