Pieron, Bob
Current rating: 1502
Record: 16-18
| Grand Prix Seattle 2019 (MH1 limited) | starting rating: 1454 | |||
| round | table | opponent (rating) | result | Δrating |
| A1sealed | 517 | Chiruvolu, Jay (1500) | Won 2-1 | +191473 |
| A2sealed | 335 | Silva, Austin (1605) | Lost 1-2 | -151458 |
| A3sealed | 308 | Lawton, Kyle (1530) | Lost 0-2 | -171441 |
| B1sealed | 346 | Larison, Peter (1516) | Won 2-1 | +191460 |
| B2sealed | 301 | Rapp, Douglas (1515) | Won 2-0 | +191479 |
| B3sealed | 181 | Zhi, Yimin (2035) | Won 2-1 | +271506 |
| B4sealed | 58 | Taylor, Logan (1727) | Won 2-1 | +221528 |
| B5sealed | 18 | Boyd, Ben (1613) | Lost 0-2 | -161512 |
| B6sealed | 137 | Kennon, Jesse (1686) | Won 2-1 | +211533 |
| B7sealed | 25 | Petronzio, Nicolas (1678) | Lost 0-2 | -151518 |
| B8sealed | 108 | Alexander, Damon (1630) | Lost 0-2 | -161502 |
| top | average opponent: 1639record: 6-5 | new rating: 1502 | ||
| Grand Prix Mexico City 2018 (GRN limited) | starting rating: 1470 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 128 | Marli, Mario (1500) | Won 2-0 | +191489 |
| 2sealed | 46 | Boone, Allan (1648) | Won 2-0 | +201509 |
| 3sealed | 76 | Paz, Juan (1442) | Lost 0-2 | -191490 |
| 4sealed | 98 | Maya, Victor (1521) | Lost 0-2 | -171473 |
| 5sealed | 148 | Perez, Luis [MEX] (1445) | Lost 0-2 | -191454 |
| top | average opponent: 1511record: 2-3 | new rating: 1454 | ||
| Grand Prix Las Vegas 2018 (limited) (DOM limited) | starting rating: 1486 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 385 | Pangman, Rob (1550) | Lost 1-2 | -171469 |
| 2sealed | 477 | Kathrens, Joel (1466) | Won 2-0 | +181487 |
| 3sealed | 608 | Irwin, Jacob (1485) | Lost 1-2 | -181469 |
| 4sealed | 678 | Van Dyk, Scott (1545) | Won 2-0 | +201489 |
| 5sealed | 551 | Daquiz, Abraham (1460) | Lost 0-2 | -191470 |
| top | average opponent: 1501record: 2-3 | new rating: 1470 | ||
| Grand Prix Las Vegas 2017 (modern) (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 453 | Pappas, Lee (1520) | Won 2-1 | +181518 |
| 2modern | 339 | Domeij, Johan (1437) | Won 2-0 | +171535 |
| 3modern | 765 | Noine, Kazuhiro (1848) | Lost 0-2 | -131522 |
| 4modern | 485 | Heckman, Christopher (1516) | Lost 1-2 | -181504 |
| 5modern | 1035 | Lee, Michael 6132 (1497) | Lost 1-2 | -181486 |
| top | average opponent: 1564record: 2-3 | new rating: 1486 | ||
| Grand Prix Las Vegas 2017 (limited) (AKH limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 476 | Ernst, Andrew (1479) | Won 2-0 | +181518 |
| 2sealed | 68 | Rowan, Richard (1432) | Won 2-0 | +161534 |
| 3sealed | 373 | Fazio, Michael (1311) | Lost 0-2 | -221512 |
| 4sealed | 613 | Henderson, Craig (1483) | Won 2-0 | +181530 |
| 5sealed | 327 | Larsson, Joel (1938) | Lost 0-2 | -111519 |
| 6sealed | 465 | Jeffries, Jeremiah (1522) | Lost 1-2 | -181501 |
| 7sealed | 655 | Brooks, Garrick (1493) | Won 2-0 | +171518 |
| 8sealed | 382 | Collister, Jason (1488) | Lost 1-2 | -181500 |
| top | average opponent: 1518record: 4-4 | new rating: 1500 | ||