Barkowski, Merle
Current rating: 1561
Record: 17-14-1
| Grand Prix Mexico City 2012 (DKA limited) | starting rating: 1620 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 1 | Leon, Gilbert (1518) | Lost 0-2 | -201600 |
| 3sealed | 156 | Casasa, Miguel (1500) | Lost 1-2 | -201580 |
| 4sealed | 265 | Flores Marquez, Alejandro (1482) | Lost 1-2 | -191561 |
| top | average opponent: 1500record: 0-3 | new rating: 1561 | ||
| Grand Prix Nashville 2012 (DKA limited) | starting rating: 1538 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 53 | Findley, Anna (1500) | Won 2-0 | +171555 |
| 3sealed | 104 | Krupski, Jared (1526) | Won 2-1 | +181573 |
| 4sealed | 19 | Nunn, Ryan (1470) | Lost 1-2 | -201553 |
| 5sealed | 251 | Conrad, Jacob (1535) | Won 2-0 | +181571 |
| 6sealed | 73 | Edwards, Craig (1829) | Won 2-0 | +221593 |
| 7sealed | 58 | Josh J., (1557) | Won 2-0 | +181611 |
| 8sealed | 49 | Rickard, Jacob R (1573) | Won 2-1 | +171628 |
| 9sealed | 17 | Cordell, Robbie (1827) | Lost 1-2 | -141614 |
| 10draft | 70 | Lee, Alex (1634) | Won 2-0 | +181632 |
| 11draft | 30 | Geary, Justin (1591) | Lost 0-2 | -191613 |
| 12draft | 17 | Harvie, Donovan (1716) | Lost 1-2 | -161597 |
| 13draft | 12 | Sulla, Aaron (1654) | Won 2-1 | +191616 |
| 14draft | 37 | Tietze, Maxwell (1904) | Lost 1-2 | -131603 |
| 15draft | 61 | Stoyer, Michael (1546) | Won 2-1 | +171620 |
| top | average opponent: 1633record: 9-5 | new rating: 1620 | ||
| Grand Prix Prague 2011 (NPH limited) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 144 | Loucim, Jaroslav (1500) | Won 2-0 | +171520 |
| 2sealed | 56 | Niznansky, Milan (1527) | Lost 1-2 | -171503 |
| 3sealed | 118 | Fukala, Dalibor (1588) | Lost 1-2 | -171486 |
| 4sealed | 260 | Schafer, Benedikt (1364) | Won 2-0 | +161502 |
| 5sealed | 147 | Kotas, Jindrich (1508) | Won 1-0 | +181520 |
| 6sealed | 144 | Havlicek, Drahomir (1516) | Won 2-0 | +181538 |
| 7sealed | 92 | Pekarek, Martin (1507) | Draw 1-1 | -11537 |
| 8sealed | 90 | Kot, Jan (1640) | Lost 1-2 | -161521 |
| 9sealed | 86 | Danek, Jan (1462) | Won 2-1 | +171538 |
| top | average opponent: 1512record: 5-3-1 | new rating: 1538 | ||
| Grand Prix Bochum 2010 (SOM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 274 | Janssen, Joris (1468) | Won 2-1 | +171517 |
| 2sealed | 146 | Stangl, Alexander (1428) | Lost 0-2 | -191498 |
| 3sealed | 238 | Friedrich, Fabian (1541) | Won 2-1 | +191517 |
| 4sealed | 241 | Pfendert, Felix (1519) | Won 2-0 | +181535 |
| 5sealed | 112 | Kanis, Jeroen (1761) | Lost 1-2 | -141521 |
| 6sealed | 235 | Kuebler, Dennis (1511) | Lost 0-2 | -181503 |
| top | average opponent: 1538record: 3-3 | new rating: 1503 | ||