Czechumski, Piotr
Current rating: 1439
Record: 4-8
| Grand Prix London 2013 (GTC limited) | starting rating: 1429 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 288 | Kelterbaum, Morgane (1522) | Won 2-1 | +201449 |
| 2sealed | 650 | Carlsson, Per (1528) | Lost 0-2 | -161433 |
| 3sealed | 705 | Goldy, Ben L (1500) | Won 2-1 | +191452 |
| 4sealed | 733 | Measures, Michael (1470) | Won 2-0 | +181470 |
| 5sealed | 252 | Tongue, C J (1541) | Lost 0-2 | -171453 |
| 6sealed | 15 | Penko, Matic (1659) | Lost 0-2 | -141439 |
| average opponent: 1537record: 3-3 | new rating: 1439 | |||
| Grand Prix Rotterdam 2009 (CON limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 124 | Lachevre, Jerome (1624) | Won 2-1 | +201520 |
| 2sealed | 137 | [anonymous] | Lost 1-2 | -181502 |
| 3sealed | 197 | Hageman, Arjan (1499) | Lost 0-2 | -181484 |
| 4sealed | 248 | Vilgo, Kristjan (1433) | Lost 1-2 | -191465 |
| 5sealed | 230 | Krutwagen, Rik (1464) | Lost 1-2 | -181447 |
| 6sealed | 203 | Heylens, Benoit (1459) | Lost 1-2 | -181429 |
| average opponent: 1499record: 1-5 | new rating: 1429 | |||