OSTREM, JOHN
Current rating: 1512
| Grand Prix Chicago 2014 (JOU standard) | starting rating: 1488 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 513 | Janssen, Spencer (1459) | Lost 1-2 | -181470 |
| 3standard | 900 | Adams, Jason (1523) | Won 2-1 | +191489 |
| 4standard | 663 | Hinds, Sean (1517) | Won 2-0 | +181507 |
| 5standard | 575 | Woodsmith, Tristan (1702) | Lost 1-2 | -141493 |
| 6standard | 618 | Hamel, Jared (1520) | Won 2-0 | +181511 |
| 7standard | 659 | Ruth, Jonathan (1543) | Won 2-0 | +191530 |
| 8standard | 546 | Passarelli, Hayden (1557) | Lost 0-2 | -181512 |
| top | average opponent: 1546record: 4-3 | new rating: 1512 | ||
| Grand Prix Detroit 2013 (modern) | starting rating: 1478 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 21 | Li, Binghan (1580) | Won 0-0 | +201498 |
| 3modern | 60 | Stone, Michael (1576) | Won 2-0 | +201518 |
| 4modern | 27 | Snook, Adam (1597) | Won 2-0 | +191537 |
| 5modern | 70 | Gibson, Kevin (1615) | Lost 1-2 | -161521 |
| 6modern | 146 | Nighbor, Chris (1722) | Lost 0-2 | -151506 |
| 7modern | 299 | Begian, Joshua (1521) | Lost 0-2 | -181488 |
| top | average opponent: 1602record: 3-3 | new rating: 1488 | ||
| Grand Prix Chicago 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 91 | Swift, Evan (1500) | Won 2-0 | +181518 |
| 2modern | 142 | Stankey, Matt (1518) | Won 2-1 | +181536 |
| 3modern | 82 | Jackson, Jacob (1499) | Won 2-0 | +171553 |
| 4modern | 95 | Hovis, Ryan (1673) | Lost 0-2 | -151538 |
| 5modern | 209 | Ivey, Greg (1439) | Lost 1-2 | -201518 |
| 6modern | 310 | Berg, Jimmy (1423) | Lost 1-2 | -201498 |
| 7modern | 323 | Cheng, Jonathon (1505) | Lost 0-2 | -181480 |
| 8modern | 269 | Hay, Ryan R (1482) | Lost 0-2 | -181462 |
| 9modern | 231 | Rivero, Robert A (1370) | Won 2-0 | +161478 |
| top | average opponent: 1490record: 4-5 | new rating: 1478 | ||