Poon, Tsz Sum
Current rating: 1542
Record: 5-3
| Grand Prix Yokohama 2019 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 259 | Nakayama, Hiroki (1500) | Won 2-1 | +181518 |
| 2modern | 207 | Tai, Akio (1507) | Lost 0-2 | -181500 |
| 3modern | 983 | Ishii, Ryou (1705) | Won 2-0 | +211521 |
| 4modern | 456 | Fuchimoto, Manabu (1511) | Won 2-0 | +181539 |
| 5modern | 194 | Nakajima, Masato (1475) | Won 2-1 | +171556 |
| 6modern | 171 | Nakamura, Hajime (1718) | Lost 0-2 | -151541 |
| 7modern | 277 | Ichikawa, Shoichi (1637) | Won 2-1 | +201561 |
| 8modern | 346 | Iwabuchi, Daisuke (1493) | Lost 0-2 | -191542 |
| average opponent: 1568record: 5-3 | new rating: 1542 | |||