Andersen, John S
Current rating: 1463
Record: 7-9
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1477 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 516 | Auciello, Sam Z (1500) | Lost 0-2 | -171460 |
| 2sealed | 674 | Eykholt, Kevin (1482) | Lost 0-2 | -181442 |
| 3sealed | 731 | Barth, Lori (1464) | Won 2-0 | +191461 |
| 4sealed | 657 | Gilbert, Kenny S (1477) | Won 2-1 | +181479 |
| 5sealed | 642 | Herr, Elijah (1500) | Lost 0-2 | -181461 |
| 6sealed | 616 | Gordon, Roger (1498) | Lost 1-2 | -171444 |
| 7sealed | 570 | Duprez, Dean (1465) | Won 2-0 | +181462 |
| 8sealed | 525 | Halley, Chris (1485) | Lost 0-2 | -171445 |
| 9sealed | 492 | Williams, Albert (1463) | Won 2-0 | +181463 |
| average opponent: 1482record: 4-5 | new rating: 1463 | |||
| Grand Prix Indianapolis 2008 (SHM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 188 | Mohr, Bryan (1487) | Lost 0-2 | -181482 |
| 2sealed | 475 | Rust, Aaron (1393) | Won 2-1 | +161498 |
| 3sealed | 406 | Vlahovich, Heather J (1502) | Won 2-0 | +181516 |
| 4sealed | 254 | Payton, Tony (1486) | Lost 0-2 | -181498 |
| 5sealed | 280 | Shakarisaz, David (1403) | Lost 1-2 | -201478 |
| 6sealed | 306 | Harber, Gabriel (1448) | Won 2-0 | +171495 |
| 7sealed | 226 | tate, curtis (1500) | Lost 0-2 | -181477 |
| average opponent: 1460record: 3-4 | new rating: 1477 | |||