Gronau, John
Current rating: 1469
| Grand Prix New Jersey 2020 (THB limited) | starting rating: 1472 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 186 | Krusinski, Michael (1459) | Draw 1-1 | 01472 |
| 2sealed | 323 | Schmidt, Steven (1503) | Won 2-0 | +181490 |
| 3sealed | 342 | Barnes, Joel (1762) | Won 2-1 | +231513 |
| 4sealed | 173 | Healy, John (1702) | Lost 0-2 | -151498 |
| 5sealed | 322 | Calcano, Christian (1866) | Lost 0-2 | -111487 |
| 6sealed | 418 | Hernandez, Alex 4383 (1506) | Lost 0-2 | -181469 |
| top | average opponent: 1633record: 2-3-1 | new rating: 1469 | ||
| Grand Prix Montreal 2019 (ELD limited) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 135 | Schultz, F. David (1500) | Lost 0-2 | -181485 |
| 2sealed | 377 | Monaghan, Thomas (1526) | Lost 0-2 | -171468 |
| 3sealed | 367 | Martel, Shai-Linh (1466) | Won 2-0 | +181486 |
| 4sealed | 322 | Kroll, Steven (1672) | Lost 0-2 | -151471 |
| 5sealed | 301 | Jeromkin, Nikolas (1520) | Won 2-0 | +191490 |
| 6sealed | 241 | Schneider, James (1484) | Lost 0-2 | -181472 |
| top | average opponent: 1528record: 2-4 | new rating: 1472 | ||
| Grand Prix New Jersey 2019 (RNA limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 92 | Wilkins, Karl (1467) | Won 2-0 | +171517 |
| 2sealed | 105 | Lorien, Jasper (1451) | Lost 0-2 | -191498 |
| 3sealed | 395 | Patell, Cyrus (1539) | Won 2-1 | +191517 |
| 4sealed | 420 | True, Samuel (1604) | Lost 1-2 | -161501 |
| 5sealed | 355 | Reale, Gabriel (1635) | Lost 1-2 | -161485 |
| 6sealed | 480 | Devault, Nancy (1492) | Won 2-0 | +181503 |
| top | average opponent: 1531record: 3-3 | new rating: 1503 | ||