Beresford, John
Current rating: 1457
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1451 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 2 | Leone, James (1500) | Lost 1-2 | -171434 |
| 2sealed | 216 | McClure, Tom j (1481) | Won 2-0 | +191453 |
| 3sealed | 240 | Nota, Al (1500) | Won 2-0 | +191472 |
| 4sealed | 282 | Jannen, Bill (1600) | Lost 1-2 | -161456 |
| 5sealed | 188 | Schuller, Mike (1499) | Won 2-0 | +191475 |
| 6sealed | 116 | Warren, Eric (1492) | Lost 0-2 | -181457 |
| top | average opponent: 1512record: 3-3 | new rating: 1457 | ||
| Grand Prix Boston 2003 (LGN limited) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 186 | Cogswell, Phillip (1500) | Won 2-1 | +191482 |
| 2sealed | 123 | Costello, Jay (1555) | Lost 0-2 | -171465 |
| 3sealed | 141 | Shears, Brett (1650) | Lost 0-2 | -141451 |
| 4sealed | 197 | Miner, Keith (1483) | Lost 1-2 | -181433 |
| 5sealed | 206 | Race, Allan (1423) | Won 2-1 | +181451 |
| top | average opponent: 1522record: 2-3 | new rating: 1451 | ||
| Grand Prix Boston 2001 (PLS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 152 | Priest, Joel (1481) | Lost 0-2 | -181482 |
| 2sealed | 186 | Ohrt, Joseph (1482) | Won 2-1 | +181500 |
| 3sealed | 161 | Lewis, Jonathan I. (1500) | Lost 0-2 | -181482 |
| 4sealed | 214 | Radzville, Rick (1465) | Lost 1-2 | -191463 |
| top | average opponent: 1482record: 1-3 | new rating: 1463 | ||