Welzenbach, Mark
Current rating: 1548
Record: 5-3-1
| Regional Championships Atlanta 2023 (pioneer) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 155 | Berkowitz, Tal (1471) | Won 2-0 | +171517 |
| 2pioneer | 276 | Valenti, Christian (1750) | Won 2-0 | +231540 |
| 3pioneer | 69 | Roper, Kaitlyn (1540) | Lost 1-2 | -181522 |
| 4pioneer | 279 | Miller, Wilson (1537) | Lost 1-2 | -181504 |
| 5pioneer | 214 | Brannon, Cory (1506) | Won 2-1 | +181522 |
| 6pioneer | 199 | Segal, Jacob (1718) | Lost 1-2 | -141508 |
| 7pioneer | 396 | Grode, Mason (1468) | Draw 1-1 | -11507 |
| 8pioneer | 302 | Calabrese, Jared (1823) | Won 2-1 | +231530 |
| 9pioneer | 220 | Matthews, Victor (1532) | Won 2-1 | +181548 |
| average opponent: 1594record: 5-3-1 | new rating: 1548 | |||