Markowitz, Jonathan
Current rating: 1467
Record: 3-5-1
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 94 | Hamel, Dave W (1500) | Lost 0-2 | -181482 |
| 2sealed | 299 | Eisenhauer, Michael (1500) | Won 2-0 | +181500 |
| 3sealed | 214 | Lara Reinhold, Marcos (1482) | Lost 0-2 | -181482 |
| 4sealed | 305 | Moore, John B (1449) | Won 2-1 | +171499 |
| 5sealed | 180 | Blackman, Brett (1710) | Lost 0-2 | -141485 |
| 6sealed | 220 | Herrmann, Nate (1485) | Won 2-0 | +181503 |
| 7sealed | 164 | Wadden, Bill (1500) | Draw 1-1 | 01503 |
| 8sealed | 124 | Hall, Lloyd (1497) | Lost 0-2 | -181485 |
| 9sealed | 95 | Tietze, Harrison (1504) | Lost 1-2 | -181467 |
| average opponent: 1514record: 3-5-1 | new rating: 1467 | |||