Barbara, Mark
Current rating: 1506
Record: 3-3
| Grand Prix London 2003 (Onslaught block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 79 | Ruth, Melvin (1500) | Won 2-0 | +181518 |
| 2block | 117 | Orsini Jones, Matteo (1518) | Lost 1-2 | -181500 |
| 3block | 142 | Trommelen, Jorn (1499) | Won 2-0 | +181518 |
| 4block | 146 | Marcik, Michal (1588) | Lost 1-2 | -171501 |
| 5block | 167 | Loud, Rich (1586) | Won 2-1 | +201521 |
| 6block | 139 | Schneider, Oliver (1672) | Lost 0-2 | -151506 |
| average opponent: 1561record: 3-3 | new rating: 1506 | |||