Kobayashi, Jon
Current rating: 1449
| Grand Prix Phoenix 2020 (pioneer) | starting rating: 1479 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 65 | Hennessey, Jeremy (1390) | Lost 1-2 | -201459 |
| 2pioneer | 269 | Bose, Cameron (1483) | Won 2-1 | +191478 |
| 3pioneer | 344 | Betts, Jonathan (1811) | Lost 1-2 | -121466 |
| 4pioneer | 357 | Coats, Jenise (1481) | Lost 1-2 | -181448 |
| 5pioneer | 390 | Seymour, Jim (1431) | Won 2-0 | +181466 |
| 6pioneer | 310 | Geyser, Mason (1524) | Lost 0-2 | -171449 |
| top | average opponent: 1520record: 2-4 | new rating: 1449 | ||
| Grand Prix Las Vegas 2019 (modern) (modern) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 537 | Mattie, David (1519) | Lost 0-2 | -171447 |
| 2modern | 539 | Cook, Nolan (1428) | Won 2-0 | +171464 |
| 3modern | 444 | Nguyen, Khang (1469) | Won 2-1 | +181482 |
| 4modern | 460 | Sutherin, Brian (1518) | Won 2-1 | +191501 |
| 5modern | 369 | Gonzalez, Dangelo (1444) | Lost 1-2 | -191482 |
| 6modern | 425 | Lehosit, Christopher (1451) | Won 2-1 | +181500 |
| 7modern | 270 | Withers, Matthew (1363) | Lost 0-2 | -211479 |
| top | average opponent: 1456record: 4-3 | new rating: 1479 | ||
| Grand Prix Los Angeles 2019 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 256 | Routzahn, Aaron (1498) | Won 2-0 | +181518 |
| 2modern | 70 | Lu, Robert (1627) | Lost 0-2 | -161502 |
| 3modern | 516 | Marin, Travis (1451) | Lost 0-2 | -191483 |
| 4modern | 693 | Otto, Matthew (1483) | Lost 0-2 | -181465 |
| 5modern | 642 | Lynguyen, Michael (1463) | Won 2-1 | +181483 |
| 6modern | 514 | Jose, Christopher (1453) | Lost 1-2 | -191464 |
| 7modern | 440 | Martinez, Jonathan 7193 (1406) | Won 2-1 | +171481 |
| 8modern | 365 | Lee, David (1499) | Lost 0-2 | -171464 |
| top | average opponent: 1485record: 3-5 | new rating: 1464 | ||