Helfer, Zachary
Current rating: 1700 (#6550)
Record: 37-32-1
| Grand Prix Pittsburgh 2018 (DOM standard) | starting rating: 1721 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 133 | Feil, Dartangian (1500) | Lost 0-2 | -211700 |
| top | record: 0-1 | new rating: 1700 | ||
| Grand Prix Louisville 2017 (legacy) | starting rating: 1568 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 583 | Wohlmacher, James (1547) | Won 2-1 | +171585 |
| 4legacy | 339 | Stern, Jon (1958) | Lost 1-2 | -111574 |
| 5legacy | 474 | Setree, Cody (1490) | Won 2-0 | +161590 |
| 6legacy | 458 | Giaccotto, David (1561) | Won 2-0 | +181608 |
| 7legacy | 353 | Syed, Zan (1976) | Won 2-1 | +241632 |
| 8legacy | 300 | Lucy, J. Sawyer (1806) | Won 2-0 | +211653 |
| 9legacy | 310 | Darby, Wyatt (1912) | Lost 1-2 | -131640 |
| 10legacy | 1077 | Bianchi, Alex (1857) | Won 2-0 | +221662 |
| 11legacy | 1040 | Harmon, Lawrence (1743) | Lost 0-2 | -171645 |
| 12legacy | 1059 | Davidson, Keenan (1679) | Won 2-1 | +191664 |
| 13legacy | 1052 | Womack, Gabriel (1709) | Won 2-1 | +191683 |
| 14legacy | 1035 | Bunnell, Scott (1788) | Won 2-0 | +201703 |
| 15legacy | 1020 | Sasser, Drake (1746) | Won 2-0 | +181721 |
| top | average opponent: 1752record: 10-3 | new rating: 1721 | ||
| Grand Prix Pittsburgh 2016 (SOI standard) | starting rating: 1531 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 327 | Kwan, Michael (1711) | Lost 1-2 | -151516 |
| 4standard | 370 | Perlee, Travis (1690) | Won 2-0 | +211537 |
| 5standard | 259 | Corte, Donald (1518) | Won 2-0 | +181555 |
| 6standard | 169 | Naylor, Jamie (1854) | Won 2-0 | +231578 |
| 7standard | 70 | Barnett, Tyler (1711) | Won 2-0 | +201598 |
| 8standard | 53 | Andrews, Tyler (1568) | Draw 1-1 | 01598 |
| 9standard | 42 | Materewicz, Christopher (1704) | Lost 1-2 | -161582 |
| 10standard | 346 | Aminto, Marco (1810) | Lost 1-2 | -141568 |
| top | average opponent: 1696record: 4-3-1 | new rating: 1568 | ||
| Grand Prix Columbus 2016 (legacy) | starting rating: 1491 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 85 | King, Shawn (1462) | Lost 1-2 | -191472 |
| 4legacy | 478 | Mason, Joshua (1387) | Won 2-1 | +171489 |
| 5legacy | 326 | Barta, Lucas (1559) | Won 2-0 | +191508 |
| 6legacy | 231 | Arrowsmith, Michael (1495) | Lost 0-2 | -181490 |
| 7legacy | 234 | Thayer, Ryan (1540) | Won 2-0 | +191509 |
| 8legacy | 182 | Lee, Jacob (1556) | Won 2-1 | +181527 |
| 9legacy | 76 | Preston, Colin (1578) | Won 2-1 | +191546 |
| 10legacy | 52 | Baugh, Jacob (1864) | Won 2-0 | +241570 |
| 11legacy | 31 | Abell, Kyle (1559) | Won 2-1 | +181588 |
| 12legacy | 20 | Bibbs, Gabriel (1755) | Lost 0-2 | -151573 |
| 13legacy | 57 | Moughon, Evart (1748) | Lost 1-2 | -151558 |
| 14legacy | 102 | Sajgalik, Eduardo (2014) | Lost 1-2 | -101548 |
| 15legacy | 110 | Ma, Jesse (1595) | Lost 0-2 | -171531 |
| top | average opponent: 1624record: 7-6 | new rating: 1531 | ||
| Grand Prix Charlotte 2016 (modern) | starting rating: 1518 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 344 | Arch, Clayton (1659) | Won 2-0 | +211539 |
| 3modern | 198 | Karalunas, Christian (1504) | Lost 1-2 | -191520 |
| 4modern | 505 | Syed, Zan (2025) | Lost 0-2 | -91511 |
| 5modern | 720 | Winsett, Ryder (1513) | Lost 0-2 | -181493 |
| 6modern | 93 | Mitchell, Andrew (1472) | Lost 0-2 | -191474 |
| 7modern | 714 | Melton, Sean (1458) | Won 2-1 | +181492 |
| 8modern | 589 | Neal, Robert (1398) | Lost 0-2 | -201472 |
| 9modern | 525 | Chen, Shawn (1487) | Won 2-0 | +191491 |
| top | average opponent: 1564record: 3-5 | new rating: 1491 | ||
| Grand Prix Pittsburgh 2015 (modern) | starting rating: 1412 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 160 | Ewing, Ethan (1518) | Won 2-1 | +201432 |
| 3modern | 241 | Chouinard, Yann-Alexandre (1508) | Won 2-0 | +201452 |
| 4modern | 105 | Petrus, Christopher (1398) | Won 2-0 | +171469 |
| 5modern | 42 | Turchioe, Matt (1574) | Won 2-0 | +201489 |
| 6modern | 58 | Loring, Russell (1544) | Won 2-1 | +191508 |
| 7modern | 15 | Benedict, Matthew (1608) | Won 2-1 | +191527 |
| 8modern | 16 | Turner, Tim (1714) | Lost 1-2 | -141513 |
| 9modern | 30 | Cox, Patrick (2038) | Lost 0-2 | -91504 |
| 10modern | 80 | Frazier, Kurtis (1453) | Won 2-0 | +171521 |
| 11modern | 95 | Herrera, Joseph (1703) | Won 2-0 | +211542 |
| 12modern | 40 | Cuneo, Andrew (2031) | Lost 0-2 | -101532 |
| 13modern | 58 | McGuffey, Charles (1617) | Lost 1-2 | -161516 |
| 14modern | 78 | Zink, Brandon (1588) | Lost 0-2 | -171499 |
| 15modern | 94 | Baker, Steven (1570) | Won 2-0 | +191518 |
| top | average opponent: 1633record: 9-5 | new rating: 1518 | ||
| Grand Prix Cleveland 2015 (FRF limited) | starting rating: 1428 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 175 | Taylor, Zakary (1474) | Lost 1-2 | -181410 |
| 2sealed | 494 | Jenkins, Nicholas (1447) | Won 2-0 | +191429 |
| 3sealed | 415 | Haukereid, Jordan (1500) | Lost 0-2 | -171412 |
| top | average opponent: 1474record: 1-2 | new rating: 1412 | ||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 301 | Nguyen, Mitchell (1500) | Lost 0-2 | -181445 |
| 3legacy | 315 | Balaz, Andrew (1429) | Won 2-0 | +181463 |
| 4legacy | 270 | Puentes, Nelson (1522) | Won 2-1 | +191482 |
| 5legacy | 220 | Albaugh, Chalmer (1514) | Lost 1-2 | -171465 |
| 6legacy | 337 | Jannati, Navid (1377) | Lost 1-2 | -201445 |
| 7legacy | 334 | Rodaitis, Andrew (1472) | Lost 0-2 | -171428 |
| top | average opponent: 1469record: 2-4 | new rating: 1428 | ||
| Grand Prix Richmond 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 453 | Martin, Avery (1500) | Won 2-0 | +181518 |
| 2modern | 75 | Fisher, Reid (1498) | Lost 1-2 | -181500 |
| 3modern | 362 | DeLazier, Jay (1500) | Lost 0-2 | -181482 |
| 4modern | 401 | Clark, Zac (1423) | Lost 0-2 | -191463 |
| top | average opponent: 1480record: 1-3 | new rating: 1463 | ||