Shaffer, Brett
Current rating: 1572
| Grand Prix Phoenix 2019 (ELD limited) | starting rating: 1523 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 5 | Hristis, Michael (1694) | Lost 0-1 | -151508 |
| 2sealed | 139 | Hu, Shengling (1778) | Won 2-1 | +221530 |
| 3sealed | 207 | Mendoza, Brandon (1407) | Won 2-0 | +161546 |
| 4sealed | 136 | Martinson, Daniel (1494) | Won 2-0 | +171563 |
| 5sealed | 90 | Swarlis, Michael (1615) | Won 2-0 | +191582 |
| 6sealed | 29 | Doherty, Shawn (1704) | Won 2-1 | +201602 |
| 7sealed | 24 | Kudva, Vikram (1734) | Lost 1-2 | -151587 |
| 8sealed | 78 | Viesca Gutierrez, Ricardo (1752) | Lost 0-2 | -151572 |
| top | average opponent: 1647record: 5-3 | new rating: 1572 | ||
| Grand Prix Phoenix 2018 (modern) | starting rating: 1542 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 19 | Coleman, Philip (1464) | Lost 0-2 | -191523 |
| top | record: 0-1 | new rating: 1523 | ||
| Grand Prix Phoenix 2017 (XLN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 26 | Gibson, Jamal (1504) | Won 2-0 | +181518 |
| 2sealed | 217 | O'Donnell, Drew (1570) | Won 2-1 | +191537 |
| 3sealed | 126 | Rockenbach, Bryan (1803) | Won 2-0 | +231560 |
| 4sealed | 66 | Cullimore, Jordan (1562) | Lost 1-2 | -181542 |
| 5sealed | 114 | De La Loza, Alejandro (1646) | Won 2-0 | +201562 |
| 6sealed | 155 | Kirkpatrick, Greg (1484) | Won 2-0 | +161578 |
| 7sealed | 62 | Rivera, Emanuel (1825) | Lost 0-2 | -131565 |
| 8sealed | 104 | Koch, Florian (1916) | Lost 0-2 | -121553 |
| 9sealed | 195 | McVety, Max (1968) | Lost 0-2 | -111542 |
| top | average opponent: 1698record: 5-4 | new rating: 1542 | ||