Griffiths, Mark
Current rating: 1536
Record: 17-16-1
| Grand Prix Manchester 2016 (SOI standard) | starting rating: 1549 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 440 | McIntosh, Stephen (1536) | Won 2-1 | +171566 |
| 2standard | 161 | Nother, Graham (1517) | Won 2-0 | +181584 |
| 3standard | 366 | Staton, Sam (1473) | Lost 0-2 | -201564 |
| 4standard | 228 | Jones, Guy (1493) | Lost 1-2 | -201544 |
| 5standard | 472 | Gruber, Klaas (1741) | Won 2-0 | +221566 |
| 6standard | 357 | Garner, Mike (1490) | Lost 1-2 | -201546 |
| 7standard | 543 | Bonde, Michael (1978) | Lost 0-2 | -101536 |
| top | average opponent: 1604record: 3-4 | new rating: 1536 | ||
| Grand Prix London 2015 (ORI standard) | starting rating: 1533 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 577 | Drescher, Thorsten (1510) | Lost 1-2 | -181515 |
| 2standard | 902 | Mcclelland, Craig C (1482) | Won 2-0 | +171532 |
| 3standard | 893 | Rooney, Chris (1500) | Won 2-0 | +181550 |
| 4standard | 751 | Oakes, Connor (1566) | Lost 0-2 | -181532 |
| 5standard | 903 | Green, Dan (1512) | Won 2-1 | +181550 |
| 6standard | 878 | Sezgin, Erman Z (1520) | Won 2-0 | +171567 |
| 7standard | 525 | Gascoigne, Alexis (1550) | Lost 0-2 | -181549 |
| top | average opponent: 1520record: 4-3 | new rating: 1549 | ||
| Grand Prix Manchester 2014 (Theros block) | starting rating: 1453 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 364 | Sinsbury, Helen (1500) | Won 2-0 | +191472 |
| 2block | 500 | Quinn, Andrew J (1518) | Draw 1-1 | +11473 |
| 3block | 279 | Maginness, Terence (1518) | Lost 1-2 | -181455 |
| 4block | 426 | Allen, Tim (1433) | Won 2-1 | +181473 |
| 5block | 283 | Jaeger, Andrew (1486) | Won 2-0 | +181491 |
| 6block | 182 | Dixon, Philip (1537) | Won 2-0 | +191510 |
| 7block | 117 | Baister, Mark (1590) | Won 2-0 | +201530 |
| 8block | 119 | McKeegan, Craig (1571) | Won 2-0 | +181548 |
| 9block | 123 | Kerem, Hannes (1706) | Lost 0-2 | -151533 |
| top | average opponent: 1540record: 6-2-1 | new rating: 1533 | ||
| Grand Prix Birmingham 2008 (Lorwyn block) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 111 | Connor, Sean M (1500) | Won 2-1 | +191465 |
| 2block | 88 | Davies, Russ (1546) | Won 2-0 | +201485 |
| 3block | 60 | Fornasari, Michele (1627) | Won 2-0 | +201505 |
| 4block | 61 | Alexander, Jon (1519) | Lost 0-2 | -171488 |
| 5block | 88 | Wray, Paul (1521) | Lost 1-2 | -181470 |
| 6block | 152 | Lailey, Mark (1509) | Lost 0-0 | -171453 |
| top | average opponent: 1537record: 3-3 | new rating: 1453 | ||
| Grand Prix Cardiff 2006 (GPT limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 46 | Le-con, Vincent (1500) | Lost 1-2 | -181482 |
| 2sealed | 117 | Mills, Ian (1428) | Lost 0-0 | -191463 |
| 3sealed | 148 | Cleak, James (1430) | Lost 0-2 | -191444 |
| 4sealed | 171 | De Klerk, Neil (1445) | Won 2-0 | +181462 |
| 5sealed | 152 | Cheng, Chestor (1569) | Lost 0-2 | -161446 |
| top | average opponent: 1475record: 1-4 | new rating: 1446 | ||