Piedras, Miguel Angel
Current rating: 1415
Record: 4-9
| Grand Prix Mexico City 2016 (OGW limited) | starting rating: 1426 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 231 | Rodriguez Salas, Isaac Axayacatl (1500) | Lost 0-2 | -161410 |
| 2sealed | 239 | Cruz, Juan (1482) | Lost 0-2 | -171393 |
| 3sealed | 341 | Jimenez Orta, Ricardo (1463) | Lost 1-2 | -171376 |
| 4sealed | 380 | Rodriguez Romo, Gustavo (1423) | Won 2-0 | +191395 |
| 5sealed | 321 | Flores Sanchez, Jonathan Michel (1467) | Won 2-1 | +191414 |
| 6sealed | 253 | Ruiz, Antonio (1436) | Won 2-0 | +191433 |
| 7sealed | 213 | Aguilar Garcia, Raul Eloy (1468) | Lost 0-2 | -181415 |
| average opponent: 1463record: 3-4 | new rating: 1415 | |||
| Grand Prix Mexico City 2015 (FRF limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 133 | Mejia, Gerardo (1500) | Lost 1-2 | -181482 |
| 2sealed | 199 | Winkler, Alejandro (1482) | Lost 0-2 | -181464 |
| 3sealed | 295 | Yozafat, Ricardo (1461) | Lost 0-2 | -181446 |
| 4sealed | 296 | rios, elias (1339) | Won 2-0 | +161462 |
| 5sealed | 255 | Hernandez Castillo, Oscar (1469) | Lost 0-2 | -181444 |
| 6sealed | 234 | Rosales Guillen, Miguel Angel (1446) | Lost 0-2 | -181426 |
| average opponent: 1450record: 1-5 | new rating: 1426 | |||