Pieroni, Matthew
Current rating: 1488
Record: 6-7
| Grand Prix Phoenix 2020 (pioneer) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 190 | Christensen, Drew (1900) | Lost 1-2 | -121504 |
| 2pioneer | 239 | Weinberger, Ben (1482) | Won 2-0 | +181522 |
| 3pioneer | 267 | Brown, Alex 2747 (1771) | Lost 0-2 | -141508 |
| 4pioneer | 371 | Baker, Steven (1412) | Won 2-1 | +171525 |
| 5pioneer | 335 | Loza, Jeremy (1498) | Lost 0-2 | -191506 |
| 6pioneer | 320 | Hill, John (1483) | Lost 0-2 | -181488 |
| average opponent: 1591record: 2-4 | new rating: 1488 | |||
| Grand Prix Las Vegas 2015 (2) (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 234 | McConnell, Dawn (1169) | Won 2-0 | +121512 |
| 2sealed | 181 | Slaugh, John (1518) | Lost 0-2 | -181494 |
| 3sealed | 217 | Keller, Michael (1425) | Lost 1-2 | -191475 |
| 4sealed | 231 | Dominguez Roldan, Alfredo (1655) | Won 2-1 | +211496 |
| 5sealed | 208 | Castro Ramirez, Arturo (1501) | Won 2-0 | +181514 |
| 6sealed | 108 | Rouse, Derek (1490) | Won 2-1 | +181532 |
| 7sealed | 99 | Shipp, Aaron (1624) | Lost 0-2 | -161516 |
| average opponent: 1483record: 4-3 | new rating: 1516 | |||