Piazza, John
Current rating: 1615
Record: 36-27
| Grand Prix Louisville 2017 (legacy) | starting rating: 1686 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 449 | Gard, Jeffrey (1524) | Won 2-1 | +151701 |
| 2legacy | 558 | Ewell, Oliver (1467) | Lost 1-2 | -221679 |
| 3legacy | 722 | Smith, Derrik (1538) | Lost 1-2 | -211658 |
| 4legacy | 990 | Spurlock, Brian (1508) | Lost 1-2 | -211637 |
| 5legacy | 934 | Downs, James (1413) | Lost 1-2 | -221615 |
| top | average opponent: 1490record: 1-4 | new rating: 1615 | ||
| Grand Prix Columbus 2016 (legacy) | starting rating: 1725 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 216 | Collins, Kenyon (1682) | Lost 1-2 | -191706 |
| 2legacy | 568 | Mangels, James (1613) | Won 2-0 | +161722 |
| 3legacy | 612 | Zulinski, Seth (1493) | Won 2-0 | +141736 |
| 4legacy | 381 | Cotton, Brian (1542) | Lost 0-2 | -211715 |
| 5legacy | 601 | Burton-Edwards, Jacob (1505) | Won 2-1 | +141729 |
| 6legacy | 427 | Gradert, Andrew (1549) | Lost 1-2 | -221707 |
| 7legacy | 588 | Sturtzel, Nick (1497) | Lost 1-2 | -211686 |
| top | average opponent: 1554record: 3-4 | new rating: 1686 | ||
| Grand Prix Detroit 2016 (modern) | starting rating: 1557 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 817 | Keen, Dylan (1471) | Lost 0-2 | -191538 |
| 2modern | 768 | Fitzgerald, Joshua (1482) | Won 2-0 | +171555 |
| 3modern | 932 | Whetstone, John Phillip (1485) | Lost 1-2 | -191536 |
| 4modern | 1077 | Klisiwecz, Michael (1482) | Won 2-0 | +171553 |
| 5modern | 608 | Switzer, Paul (1444) | Won 2-1 | +161569 |
| 6modern | 652 | Ostap, Adam (1533) | Won 2-1 | +171586 |
| 7modern | 364 | Timmerman, Trace (1532) | Won 2-1 | +171603 |
| 8modern | 144 | McLaren, Dean (1562) | Won 2-1 | +171620 |
| 9modern | 154 | Lepore, Frank (1969) | Won 2-1 | +241644 |
| 10modern | 61 | Henke, Patrick (1564) | Won 2-1 | +171661 |
| 11modern | 28 | Baugh, Jacob (1822) | Won 2-1 | +211682 |
| 12modern | 52 | Arts, Marshall (1579) | Won 2-1 | +161698 |
| 13modern | 8 | Syed, Zan (1987) | Won 2-1 | +231721 |
| 14modern | 14 | Delano, Jonathan (1747) | Won 2-1 | +191740 |
| 15modern | 11 | Reed, David (1907) | Lost 0-2 | -151725 |
| top | average opponent: 1638record: 12-3 | new rating: 1725 | ||
| Grand Prix Detroit 2013 (modern) | starting rating: 1525 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 14 | Olszowy, John h (1471) | Won 2-1 | +171542 |
| 2modern | 283 | Davis, Randy (1614) | Lost 0-0 | -171525 |
| 3modern | 447 | Pellizzoni, Rodolfo (1497) | Won 2-1 | +181543 |
| 4modern | 419 | Burrell, Joseph (1448) | Lost 1-2 | -201523 |
| 5modern | 543 | Czubek, Michael R (1385) | Won 2-0 | +151538 |
| 6modern | 335 | Hoyt, Matthew (1451) | Won 2-0 | +171555 |
| 7modern | 309 | Ribak, Sergei (1535) | Won 0-0 | +171572 |
| 8modern | 98 | Estrada, Caleb (1739) | Lost 0-2 | -151557 |
| top | average opponent: 1517record: 5-3 | new rating: 1557 | ||
| Grand Prix Columbus 2012 (modern) | starting rating: 1547 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 211 | Lis, Dan (1466) | Won 2-1 | +171564 |
| 3modern | 138 | Weidinger, Christopher (1519) | Lost 1-2 | -191545 |
| 4modern | 228 | Moore, Jeffrey (1514) | Lost 0-2 | -191526 |
| 5modern | 408 | Turner, Maxx (1441) | Won 2-1 | +171543 |
| 6modern | 286 | Stewart, Edward (1537) | Lost 0-2 | -181525 |
| top | average opponent: 1495record: 2-3 | new rating: 1525 | ||
| Grand Prix Indianapolis 2012 (legacy) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 172 | Bogucki, Dan J (1500) | Lost 1-2 | -181518 |
| 2legacy | 347 | Rosberry, Jake (1482) | Won 2-0 | +171535 |
| 3legacy | 285 | Seliskar, Stephen (1413) | Won 2-1 | +161551 |
| 4legacy | 292 | Mani, Jimmy D (1502) | Won 2-1 | +171568 |
| 5legacy | 197 | Holt, Robert (1522) | Won 2-1 | +171585 |
| 6legacy | 132 | Hamilton, Alexander (1556) | Won 2-1 | +171602 |
| 7legacy | 67 | Van Deelen, Mike (1503) | Lost 0-2 | -191583 |
| 8legacy | 88 | Glantzman, Joshua (1551) | Lost 1-2 | -191564 |
| 9legacy | 101 | Burton, Brandon (1634) | Lost 1-2 | -171547 |
| top | average opponent: 1518record: 5-4 | new rating: 1547 | ||
| Grand Prix Columbus 2010 (legacy) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 500 | Sasset, Alex (1500) | Won 2-0 | +181517 |
| 2legacy | 494 | Inlow, Sean (1618) | Won 2-0 | +201537 |
| 3legacy | 402 | March, Joey (1536) | Lost 0-2 | -181519 |
| 4legacy | 539 | Maddock, Todd (1569) | Lost 1-2 | -171502 |
| 5legacy | 568 | Mackenzie, Rachel C (1494) | Won 2-0 | +181520 |
| 6legacy | 557 | Flanigan, Shane (1474) | Won 2-1 | +171537 |
| 7legacy | 481 | Ramaley, Frank C (1534) | Won 2-1 | +181555 |
| 8legacy | 452 | Duncan, Kyle A (1502) | Lost 0-2 | -191536 |
| top | average opponent: 1528record: 5-3 | new rating: 1536 | ||
| Grand Prix Washington DC 2010 (ROE standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 717 | Daniel, Anthony M (1500) | Won 2-0 | +181518 |
| 2standard | 701 | Pambianchi, Robert (1518) | Lost 1-2 | -181500 |
| 3standard | 857 | Anderegg, Morgan (1502) | Lost 0-2 | -181482 |
| 4standard | 997 | Zwyer, Edward D (1518) | Won 2-1 | +191501 |
| 5standard | 833 | Orlick, Robert (1499) | Won 2-0 | +181519 |
| 6standard | 833 | Richardson, Chris (1453) | Lost 1-2 | -201499 |
| top | average opponent: 1498record: 3-3 | new rating: 1499 | ||