Guy, Marcus
Current rating: 1470
Record: 4-6
| Grand Prix Boston 2003 (LGN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 53 | Bachmann, David (1671) | Lost 0-2 | -151485 |
| 5sealed | 48 | Dowd, Michael (1532) | Lost 0-2 | -171468 |
| 6sealed | 132 | mancuso, Stephen (1517) | Won 2-1 | +191487 |
| 7sealed | 108 | Valera, Brandon (1559) | Lost 1-2 | -171470 |
| average opponent: 1570record: 1-3 | new rating: 1470 | |||
| Grand Prix Philadelphia 2000 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 121 | Styles, Chris (1500) | Won 0-0 | +181518 |
| 2extended | 79 | Weaver, Chad (1518) | Won 0-0 | +181536 |
| 3extended | 45 | Gemmill, Benjamin (1536) | Lost 0-0 | -181518 |
| 4extended | 118 | Redman, Christopher (1516) | Won 0-0 | +181536 |
| 5extended | 49 | Carpenter, Ryan (1561) | Lost 0-0 | -181518 |
| 6extended | 114 | Lute, John (1501) | Lost 0-0 | -181500 |
| average opponent: 1522record: 3-3 | new rating: 1500 | |||