Koch, Zachary
Current rating: 1823 (#1667)
Record: 55-33
| Grand Prix Richmond 2018 (leg) (legacy) | starting rating: 1781 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 154 | Livingston, Robert (1628) | Won 2-1 | +161797 |
| 3legacy | 195 | Tomsovic, Tommy (1719) | Won 2-0 | +161813 |
| 4legacy | 56 | Verdesoto, Daniel (1658) | Lost 1-2 | -211792 |
| 5legacy | 138 | Kuo, Justin (1620) | Lost 0-2 | -211771 |
| 6legacy | 187 | Ahn, Sung-Jin (1847) | Won 2-0 | +201791 |
| 7legacy | 189 | Archer, Corey (1537) | Won 2-1 | +131804 |
| 8legacy | 118 | Kovacs, Robert (1573) | Won 2-1 | +141818 |
| 9legacy | 2040 | Porter, Steven (1578) | Won 2-0 | +141832 |
| 10legacy | 2019 | Biaggi, Andrea (1598) | Won 2-0 | +141846 |
| 11legacy | 2027 | Christensen, Luke (1718) | Lost 0-2 | -211825 |
| 12legacy | 2046 | Stein, Abraham (1913) | Won 2-1 | +201845 |
| 13legacy | 2035 | Blackwell, Keith (1758) | Lost 1-2 | -201825 |
| 14legacy | 2050 | Kirby, Zachary (1784) | Won 2-0 | +171842 |
| 15legacy | 2033 | Naide, Kazutaka (1785) | Lost 1-2 | -191823 |
| top | average opponent: 1694record: 9-5 | new rating: 1823 | ||
| Grand Prix Birmingham 2018 (leg) (legacy) | starting rating: 1815 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 194 | Klein, Philipp (1477) | Won 2-1 | +121827 |
| 3legacy | 125 | Vogt, Marc (1804) | Won 2-1 | +181845 |
| 4legacy | 109 | Hitz, Michael (1905) | Lost 1-2 | -171828 |
| 5legacy | 137 | Choca, Joao (1887) | Lost 1-2 | -171811 |
| 6legacy | 283 | Miracca, Alessandro (1562) | Lost 0-2 | -221789 |
| 7legacy | 323 | Tell, Jonathan (1478) | Won 2-1 | +121801 |
| 8legacy | 228 | Omrcen, Ante (1706) | Lost 0-2 | -201781 |
| top | average opponent: 1688record: 3-4 | new rating: 1781 | ||
| Grand Prix Las Vegas 2017 (legacy) (legacy) | starting rating: 1679 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 283 | Rosander, Jesse (1517) | Won 2-1 | +151694 |
| 3legacy | 2128 | Schwab, Jason (1177) | Won 2-1 | +101704 |
| 4legacy | 86 | Smith, Anthony (1433) | Won 2-0 | +131717 |
| 5legacy | 85 | Stan, Robert (1740) | Won 2-1 | +181735 |
| 6legacy | 56 | Nguyen, Michael (1558) | Won 2-1 | +151750 |
| 7legacy | 41 | Turner, Brandon7669 (1617) | Won 2-0 | +161766 |
| 8legacy | 2 | Boswell, Andrew (2003) | Won 2-0 | +221788 |
| 9legacy | 2 | Fast, Zachary (1664) | Won 2-0 | +161804 |
| 10legacy | 2 | Smith, Nathaniel (2157) | Won 2-1 | +241828 |
| 11legacy | 1 | Tierney, Patrick (2128) | Won 2-1 | +231851 |
| 12legacy | 1 | Roukas, Sam (1875) | Won 2-1 | +191870 |
| 13legacy | 1 | Semeyn, Jonathan (1665) | Lost 1-2 | -221848 |
| 14legacy | 4 | Baxter III, Lincoln (1795) | Lost 0-2 | -191829 |
| 15legacy | 4 | Tharmaratnam, Samuel (2077) | Lost 0-2 | -141815 |
| top | average opponent: 1743record: 11-3 | new rating: 1815 | ||
| Grand Prix Louisville 2017 (legacy) | starting rating: 1626 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 333 | Stuart, Steve (1547) | Lost 1-2 | -191607 |
| 4legacy | 493 | Brickman, Justin (1494) | Won 2-1 | +161623 |
| 5legacy | 538 | Pisano, Rob (2122) | Won 2-1 | +261649 |
| 6legacy | 359 | Rice, Sean (1675) | Lost 0-2 | -171632 |
| 7legacy | 593 | Lopez, Eric (1607) | Lost 1-2 | -191613 |
| 8legacy | 654 | Hoffman, Larry (1487) | Won 2-1 | +161629 |
| 9legacy | 470 | Compton, Travis (1631) | Won 2-0 | +181647 |
| 10legacy | 1118 | Magers, Jacob (1572) | Won 2-0 | +171664 |
| 11legacy | 1140 | Davidson, Keenan (1661) | Lost 1-2 | -181646 |
| 12legacy | 1155 | Saracino, Jacob (1780) | Lost 0-2 | -161630 |
| 13legacy | 1170 | Black, Thomas (1546) | Won 2-1 | +161646 |
| 14legacy | 1153 | Krasa, Robert (1557) | Won 2-0 | +171663 |
| 15legacy | 1125 | Martin, Spencer (1572) | Won 2-0 | +161679 |
| top | average opponent: 1635record: 8-5 | new rating: 1679 | ||
| Grand Prix Columbus 2016 (legacy) | starting rating: 1700 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 340 | Scheffenacker, Michael (1684) | Lost 1-2 | -181682 |
| 4legacy | 318 | Mollenkopf, Tyler (1510) | Lost 0-2 | -211661 |
| 5legacy | 625 | Overfield, Jeffrey (1506) | Lost 1-2 | -211640 |
| 6legacy | 668 | Heinrich, Jered (1496) | Lost 0-2 | -211619 |
| 7legacy | 662 | Xie, Zhongyuan (1469) | Won 2-1 | +161635 |
| 8legacy | 515 | Yahya, Rachid (1351) | Won 2-0 | +131648 |
| 9legacy | 432 | D'Angelo, Derek (1460) | Lost 0-2 | -221626 |
| top | average opponent: 1497record: 2-5 | new rating: 1626 | ||
| Grand Prix Charlotte 2016 (modern) | starting rating: 1714 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 103 | Gentile, Greg (1447) | Lost 1-2 | -221692 |
| 3modern | 781 | Satterfield, Nathan (1521) | Won 2-0 | +141706 |
| 4modern | 366 | Paris, Patrick (1595) | Won 2-0 | +161722 |
| 5modern | 218 | Babson, McCray (1485) | Lost 0-2 | -221700 |
| top | average opponent: 1512record: 2-2 | new rating: 1700 | ||
| Grand Prix Seattle-Tacoma 2015 (legacy) | starting rating: 1537 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 502 | Kasprzak, Aaron (1544) | Won 2-1 | +181555 |
| 2legacy | 1 | Austria, Alfred (1539) | Won 2-0 | +181573 |
| 3legacy | 332 | Fornace, Chris (1570) | Lost 0-2 | -181555 |
| 4legacy | 543 | Houle, Ray (1663) | Won 2-1 | +201575 |
| 5legacy | 237 | Mendoza, Paige (1558) | Won 2-1 | +171592 |
| 6legacy | 76 | Miller, Michael (1462) | Won 2-1 | +161608 |
| 7legacy | 55 | Bates, Harrison (1529) | Won 2-0 | +161624 |
| 8legacy | 30 | Woolley, Tyler (1680) | Won 2-0 | +201644 |
| 9legacy | 41 | Lacey, Kyle (1608) | Won 2-0 | +171661 |
| 10legacy | 11 | Wijaya, Vidianto (2052) | Lost 0-2 | -111650 |
| 11legacy | 63 | Somerville, Michael (1597) | Won 2-1 | +171667 |
| 12legacy | 23 | Mulcahy, Luke (2012) | Won 0-0 | +241691 |
| 13legacy | 8 | Keith, Jody (1851) | Lost 0-0 | -151676 |
| 14legacy | 44 | Mok, Wilson (1848) | Won 2-1 | +211697 |
| 15legacy | 25 | Kho, Richard (1673) | Won 2-0 | +171714 |
| top | average opponent: 1679record: 12-3 | new rating: 1714 | ||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1553 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 550 | Campbell, Andrew (1500) | Won 2-1 | +171570 |
| 2modern | 430 | Brown, Grady (1517) | Won 2-0 | +171587 |
| 3modern | 216 | Orange, Gregory (1927) | Lost 1-2 | -121575 |
| 4modern | 330 | Chirichello, Carmine (1501) | Lost 1-2 | -191556 |
| 5modern | 500 | Nicholson, Matthew (1503) | Lost 1-2 | -191537 |
| top | average opponent: 1590record: 2-3 | new rating: 1537 | ||
| Grand Prix Atlanta 2014 (JOU limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 245 | Bailey, Alexander (1523) | Won 2-0 | +181518 |
| 2sealed | 385 | Garner, Christian (1519) | Won 2-1 | +181536 |
| 3sealed | 379 | Preisler, Lowell (1537) | Won 2-0 | +181554 |
| 4sealed | 333 | Mullins, Sinjin (1553) | Won 2-0 | +181572 |
| 5sealed | 260 | Lynch, Jeffrey (1568) | Won 2-1 | +181590 |
| 6sealed | 222 | Wood, Joseph (1542) | Lost 1-2 | -191571 |
| 7sealed | 259 | Flynn, Ryan (1557) | Won 2-0 | +181589 |
| 8sealed | 255 | Cardozo, Daniel (1576) | Lost 1-2 | -181571 |
| 9sealed | 274 | Adams, Sean T (1581) | Lost 1-2 | -181553 |
| top | average opponent: 1550record: 6-3 | new rating: 1553 | ||