Piles, John
Current rating: 1501
Record: 32-38-1
| Grand Prix Denver 2019 (M20 standard) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 148 | Stark, Mason (1500) | Won 2-1 | +181519 |
| 2standard | 135 | Bhuiyan, Jamil (1518) | Lost 1-2 | -191500 |
| 3standard | 171 | Billiot, Rachel (1507) | Lost 1-2 | -171483 |
| 4standard | 256 | Kot, Steven (1440) | Lost 0-2 | -191464 |
| 5standard | 249 | Barth, Ryan (1401) | Won 2-0 | +171481 |
| 6standard | 219 | Rummelhart, Joshua (1478) | Won 2-0 | +181499 |
| 7standard | 170 | Snow, Daniel (1723) | Lost 0-1 | -141485 |
| 8standard | 146 | Bueno-Coto, Bolivar (1397) | Won 2-0 | +161501 |
| top | average opponent: 1496record: 4-4 | new rating: 1501 | ||
| Grand Prix Dallas-Fort Worth 2019 (modern) | starting rating: 1542 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 389 | Leander, Mark (1500) | Lost 1-2 | -191523 |
| 2modern | 490 | Carson, Christopher (1484) | Won 2-0 | +181541 |
| 3modern | 299 | Ulrich, Katie (1463) | Lost 0-2 | -201521 |
| 4modern | 396 | Doan, Ryan (1414) | Lost 0-2 | -201501 |
| 5modern | 512 | Woelke, Dustin (1464) | Won 2-0 | +181519 |
| 6modern | 415 | Brown, Jacob (1513) | Lost 0-2 | -181501 |
| top | average opponent: 1473record: 2-4 | new rating: 1501 | ||
| Grand Prix Las Vegas 2018 (limited) (DOM limited) | starting rating: 1395 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 448 | Fellman, Sean (1717) | Won 2-0 | +241419 |
| 2sealed | 4 | Laforge, Adam (1408) | Won 2-0 | +171436 |
| 3sealed | 163 | Herr, Paul (1949) | Won 2-0 | +271463 |
| 4sealed | 107 | Lopez, Zack (1490) | Won 2-0 | +191482 |
| 5sealed | 61 | Harski, Kevin (1493) | Lost 1-2 | -181464 |
| 6sealed | 75 | Tan, James (1787) | Won 2-1 | +231487 |
| 7sealed | 1313 | Steiner, Casey (1573) | Lost 0-2 | -161471 |
| 8sealed | 190 | Arreygue, Anthony (1518) | Won 2-0 | +191490 |
| 9sealed | 170 | Martell, Tom (1866) | Won 2-1 | +241514 |
| 10draft | 5087 | Saltzman, Ryan (1558) | Won 2-0 | +191533 |
| 11draft | 5088 | Tamblyn, Mitchell (1964) | Won 2-0 | +261559 |
| 12draft | 5083 | Mok, Wilson (1887) | Lost 1-2 | -131546 |
| 13draft | 5124 | Cunniff, Raphael (1741) | Lost 1-2 | -141532 |
| 14draft | 5090 | Truong, Daniel (1680) | Lost 0-2 | -151517 |
| 15draft | 5104 | Weitz, Benjamin (1958) | Won 2-0 | +251542 |
| top | average opponent: 1706record: 10-5 | new rating: 1542 | ||
| Grand Prix Phoenix 2018 (modern) | starting rating: 1356 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 101 | Moore, Allen (1581) | Lost 1-2 | -141342 |
| 2modern | 459 | Johnson, Colin 2 (1482) | Won 2-1 | +201362 |
| 3modern | 426 | Arnson, Fritz (1498) | Won 2-0 | +211383 |
| 4modern | 400 | Pignatari, Dan (1519) | Won 2-1 | +201403 |
| 5modern | 276 | McCulley, Lance (1422) | Won 2-1 | +191422 |
| 6modern | 88 | Banuelos, Victor (1508) | Lost 0-2 | -171405 |
| 7modern | 223 | Kovac, Chase (1860) | Lost 1-2 | -101395 |
| top | average opponent: 1553record: 4-3 | new rating: 1395 | ||
| Grand Prix Las Vegas 2017 (limited) (AKH limited) | starting rating: 1362 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 598 | Verbiest, Bart (1734) | Lost 1-2 | -111351 |
| 2sealed | 795 | Chen, Elly (1487) | Lost 0-2 | -161335 |
| 3sealed | 1050 | Vogler, Zeke (1465) | Won 2-1 | +201355 |
| 4sealed | 827 | Her, Christian (1484) | Won 2-0 | +211376 |
| 5sealed | 801 | Bautista, Gino (1266) | Lost 0-2 | -201356 |
| top | average opponent: 1487record: 2-3 | new rating: 1356 | ||
| Grand Prix Albuquerque 2016 (SOI limited) | starting rating: 1390 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 226 | Sturgis, Kirk (1500) | Lost 0-2 | -161374 |
| 2sealed | 467 | Haberthier, Matthew (1485) | Won 2-1 | +201394 |
| 3sealed | 512 | Poncelet, Kevin (1469) | Lost 0-2 | -171377 |
| 4sealed | 457 | Garcia, Jeremy (1485) | Draw 1-1 | +21379 |
| 5sealed | 465 | Martin, James (1420) | Lost 0-2 | -171362 |
| top | average opponent: 1472record: 1-3-1 | new rating: 1362 | ||
| Grand Prix Las Vegas 2015 (2) (MM2 limited) | starting rating: 1435 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 73 | Scofield, Garrett (1500) | Lost 1-2 | -161419 |
| 4sealed | 190 | Kelly, Sean (1526) | Won 2-1 | +201439 |
| 5sealed | 48 | Friberg, Chris (1503) | Won 2-0 | +191458 |
| 6sealed | 74 | Jones, Gregory (1538) | Lost 0-2 | -171441 |
| 7sealed | 98 | Howa, Levi (1460) | Lost 0-2 | -171424 |
| 8sealed | 104 | Lucas, Michael (1474) | Lost 1-2 | -181406 |
| 9sealed | 87 | Pierce, Lucius (1500) | Lost 0-2 | -161390 |
| top | average opponent: 1500record: 2-5 | new rating: 1390 | ||
| Grand Prix Los Angeles 2014 (KTK standard) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 182 | Overton, Thomas (1549) | Won 2-1 | +191506 |
| 2standard | 328 | Boutin, Alec (1518) | Lost 0-2 | -181488 |
| 3standard | 456 | Rubin, Rafi (1538) | Lost 1-2 | -171471 |
| 4standard | 694 | Tse, Wang (1548) | Won 2-0 | +191490 |
| 5standard | 504 | Subasi, Omer (1503) | Won 2-0 | +181508 |
| 6standard | 271 | Schafer, Jordan (1477) | Lost 1-2 | -181490 |
| 7standard | 410 | Le, Tony (1486) | Lost 1-2 | -181472 |
| 8standard | 379 | Chow, Edward (1452) | Lost 0-2 | -191453 |
| 9standard | 307 | Vetter, Christopher (1451) | Lost 1-2 | -181435 |
| top | average opponent: 1502record: 3-6 | new rating: 1435 | ||
| Grand Prix Phoenix 2014 (BNG standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 191 | Windsor, Aaron (1500) | Won 2-0 | +181518 |
| 2standard | 8 | Hristis, Michael (1698) | Lost 1-2 | -151503 |
| 3standard | 321 | Martineau, Trevor (1468) | Lost 1-2 | -181485 |
| 4standard | 598 | Chang, Kat (1482) | Won 2-0 | +181503 |
| 5standard | 340 | Easley, Chris (1500) | Won 2-1 | +181521 |
| 6standard | 261 | Franklin, Lance (1602) | Won 2-0 | +191540 |
| 7standard | 291 | bailey, kenneth d (1557) | Lost 0-2 | -181522 |
| 8standard | 283 | Squires, Ryan (1519) | Lost 0-2 | -181504 |
| 9standard | 257 | Fox, Adam H (1520) | Lost 0-2 | -171487 |
| top | average opponent: 1539record: 4-5 | new rating: 1487 | ||