Johnston, Sam
Current rating: 1635
Record: 21-13-1
| Grand Prix Milwaukee 2018 (GRN standard) | starting rating: 1597 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 88 | Pohl, Thomas (1486) | Won 2-0 | +161613 |
| 2standard | 128 | Galitz, Nick (1500) | Won 2-1 | +161629 |
| 3standard | 139 | Lunn, Angel (1534) | Won 2-1 | +161645 |
| 4standard | 128 | Sikkink Johnson, Matt (2114) | Lost 0-2 | -101635 |
| 5standard | 172 | Theisen, Brad (1667) | Won 2-1 | +191654 |
| 6standard | 156 | Kizuka, Jeremy (1598) | Won 2-1 | +171671 |
| 7standard | 30 | Den Boon, Martijn (1533) | Lost 0-2 | -211650 |
| 8standard | 135 | Neville, John (1559) | Won 2-1 | +161666 |
| 9standard | 52 | Casassanta, Thiago (1912) | Lost 0-2 | -131653 |
| 10standard | 117 | Weber, Cody (1690) | Lost 0-2 | -181635 |
| top | average opponent: 1659record: 6-4 | new rating: 1635 | ||
| Grand Prix San Antonio 2014 (KTK standard) | starting rating: 1606 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 111 | George, John (1554) | Won 2-1 | +171623 |
| 3standard | 180 | Hebert, Daniel (1544) | Lost 0-2 | -191604 |
| 4standard | 168 | Homsi, Chris (1482) | Lost 0-2 | -201584 |
| 5standard | 390 | Trnavsky, Brad (1500) | Won 2-1 | +161600 |
| 6standard | 172 | Soliz, Noe (1521) | Won 2-1 | +171617 |
| 7standard | 191 | Wiznitzer, Aryeh (1696) | Lost 0-2 | -171600 |
| 8standard | 192 | Williams, Jonathan (1498) | Lost 1-2 | -201580 |
| 9standard | 164 | Castillo, Nicholas (1501) | Won 2-1 | +171597 |
| top | average opponent: 1537record: 4-4 | new rating: 1597 | ||
| Grand Prix Louisville 2013 (THS standard) | starting rating: 1571 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 181 | Hains, Thomas (1518) | Won 2-1 | +171588 |
| 3standard | 145 | Wright, Tom (1538) | Won 2-0 | +171605 |
| 4standard | 129 | Rodgers, Logan (1573) | Won 2-1 | +181623 |
| 5standard | 110 | Usary, Marsh (1798) | Lost 1-2 | -151608 |
| 6standard | 182 | Krupski, Jared (1577) | Won 2-1 | +171625 |
| 7standard | 189 | Turner, Audis (1572) | Won 2-0 | +171642 |
| 8standard | 144 | Herrera, Joseph (1671) | Lost 1-2 | -171625 |
| 9standard | 142 | Clark, Eric (1579) | Lost 1-2 | -191606 |
| top | average opponent: 1603record: 5-3 | new rating: 1606 | ||
| Grand Prix Detroit 2013 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 314 | Smalley, Matt (1500) | Draw 1-1 | 01500 |
| 2modern | 334 | Foshe, Chris (1507) | Lost 0-0 | -181482 |
| 3modern | 572 | Groen, Joshua (1417) | Won 2-0 | +171499 |
| 4modern | 486 | Orr, Kevin (1501) | Lost 0-2 | -181481 |
| 5modern | 563 | Somma, Mike (1482) | Won 2-1 | +181499 |
| 6modern | 444 | Luplow, Steve (1499) | Won 2-0 | +181517 |
| 7modern | 162 | Ayers, Patrick (1555) | Won 2-1 | +191536 |
| 8modern | 231 | Fox, Eric (1502) | Won 2-1 | +171553 |
| 9modern | 159 | Davis, Samar (1567) | Won 2-0 | +181571 |
| top | average opponent: 1504record: 6-2-1 | new rating: 1571 | ||