Hallahan, Brian
Current rating: 1632
Record: 58-51-1
Grand Prix Chicago 2009Grand Prix Minneapolis 2009Grand Prix Lincoln 2012Grand Prix Minneapolis 2012Grand Prix Chicago 2012Grand Prix Oklahoma City 2013Grand Prix Minneapolis 2014Grand Prix Chicago 2014Grand Prix Oklahoma City 2015Grand Prix Madison 2015Grand Prix Minneapolis 2016Grand Prix Minneapolis 2017Grand Prix Minneapolis 2018Grand Prix Milwaukee 2018Grand Prix Minneapolis 2019
| Grand Prix Minneapolis 2019 (modern) | starting rating: 1622 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 239 | Carlson, Cody (1576) | Won 2-1 | +171639 |
| 2modern | 102 | Woodward, Scott (1581) | Lost 1-2 | -191620 |
| 3modern | 338 | Schoppers, Kody (1505) | Won 2-0 | +161636 |
| 4modern | 118 | Taugner, Devin (1518) | Lost 0-2 | -201616 |
| 5modern | 339 | Anderson, Anthony (1487) | Won 2-1 | +161632 |
| 6modern | 210 | Marino, Lee (1838) | Won 2-1 | +211653 |
| 7modern | 95 | Knopp, Charles (1478) | Lost 1-2 | -211632 |
| top | average opponent: 1569record: 4-3 | new rating: 1632 | ||
| Grand Prix Milwaukee 2018 (GRN standard) | starting rating: 1633 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 234 | Spiering, Sean (1500) | Won 2-1 | +151648 |
| 2standard | 148 | Dawson, John (1514) | Won 2-1 | +161664 |
| 3standard | 142 | Cullinan, Shane (1535) | Lost 0-2 | -211643 |
| 4standard | 323 | Darnall, Matthew (1680) | Won 2-0 | +191662 |
| 5standard | 83 | Ruettiger, Bryant (1588) | Lost 0-2 | -191643 |
| 6standard | 359 | Graebner, Samuel (1495) | Lost 0-2 | -211622 |
| top | average opponent: 1552record: 3-3 | new rating: 1622 | ||
| Grand Prix Minneapolis 2018 (M19 limited) | starting rating: 1663 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 124 | Morley, Jeremy (1500) | Lost 1-2 | -201643 |
| 2sealed | 439 | Kesher, Max (1482) | Won 2-0 | +151658 |
| 3sealed | 449 | Styczinski, Aaron (1500) | Won 2-1 | +151673 |
| 4sealed | 386 | VanDinter, Nathan (1480) | Lost 1-2 | -221651 |
| 5sealed | 462 | Roy, Anjon (1610) | Lost 1-2 | -181633 |
| top | average opponent: 1515record: 2-3 | new rating: 1633 | ||
| Grand Prix Minneapolis 2017 (HOU standard) | starting rating: 1662 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 29 | Tran, Saron (1413) | Won 2-1 | +131675 |
| 2standard | 245 | Cheney, Calvin (1500) | Lost 0-2 | -211654 |
| 3standard | 344 | Dreblow, Caroline (1523) | Won 2-1 | +161670 |
| 4standard | 273 | Edwards, Mitchell (1707) | Lost 0-2 | -181652 |
| 5standard | 246 | Crowder, Justin (1432) | Won 2-1 | +151667 |
| 6standard | 199 | Nelson, Erik (1469) | Won 2-0 | +141681 |
| 7standard | 201 | Peters, Kyle (1944) | Won 2-1 | +231704 |
| 8standard | 144 | Tan, Edgar (1617) | Lost 0-2 | -201684 |
| 9standard | 146 | Dillon, Rax (1542) | Lost 0-2 | -211663 |
| top | average opponent: 1572record: 5-4 | new rating: 1663 | ||
| Grand Prix Minneapolis 2016 (SOI standard) | starting rating: 1631 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 165 | Scofield, Garrett (1587) | Lost 1-2 | -191612 |
| 2standard | 516 | Schaitberger, Christopher (1482) | Won 2-0 | +161628 |
| 3standard | 596 | Richter, Nicholas (1559) | Won 2-0 | +171645 |
| 4standard | 317 | Tierney, Justin (1466) | Won 2-0 | +141659 |
| 5standard | 176 | Wilt, Ryan (1485) | Lost 1-2 | -211638 |
| 6standard | 260 | Mathis, Jeffrey (1466) | Won 2-0 | +151653 |
| 7standard | 146 | Bugenhagen, Jeff (1588) | Won 2-0 | +171670 |
| 8standard | 123 | Zahn, Michael (1726) | Won 2-0 | +191689 |
| 9standard | 50 | Andrews, Joey (1619) | Won 2-0 | +171706 |
| 10standard | 77 | Pearse, Christian (1718) | Lost 0-2 | -181688 |
| 11standard | 109 | Rappaport, Ben (1506) | Lost 0-2 | -211667 |
| 12standard | 154 | Kiefer, Quinn (1461) | Won 2-1 | +141681 |
| 13standard | 119 | Althiser, Matthan (1615) | Lost 0-2 | -191662 |
| top | average opponent: 1560record: 8-5 | new rating: 1662 | ||
| Grand Prix Madison 2015 (BFZ limited) | starting rating: 1519 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 65 | Henrikson, Ascher (1500) | Won 2-0 | +181537 |
| 2sealed | 1002 | Monahan, Matthew (1584) | Won 2-0 | +191556 |
| 3sealed | 111 | Martinez, Julian (1693) | Won 2-0 | +201576 |
| 4sealed | 1013 | Rodriguez, Jysf (1591) | Lost 0-2 | -181558 |
| 5sealed | 178 | Staal, Taran (1571) | Won 2-0 | +191577 |
| 6sealed | 57 | Ashton, Thomas (2055) | Lost 1-2 | -101567 |
| 7sealed | 215 | Yang, Fanchen (1573) | Won 2-0 | +181585 |
| 8sealed | 179 | Dolar, Robin (1951) | Won 2-1 | +241609 |
| 9sealed | 142 | Nelson, Jon (1536) | Won 2-0 | +171626 |
| 10draft | 67 | Benzinger, Chris (1713) | Won 2-0 | +201646 |
| 11draft | 24 | Cappetta, G. J. (1624) | Lost 1-2 | -191627 |
| 12draft | 48 | Tuthill, Nikolai (1713) | Won 2-0 | +201647 |
| 13draft | 15 | Lozano, Andrew (1869) | Lost 0-2 | -141633 |
| 14draft | 71 | McKenna, William (1567) | Lost 1-2 | -191614 |
| 15draft | 63 | Cappetta, G. J. (1590) | Won 2-1 | +171631 |
| top | average opponent: 1675record: 10-5 | new rating: 1631 | ||
| Grand Prix Oklahoma City 2015 (modern) | starting rating: 1537 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 161 | Arquitola, Emilio (1537) | Lost 0-2 | -181519 |
| 2modern | 522 | Tipton, George (1485) | Lost 0-2 | -191500 |
| 3modern | 617 | Luttrull, Jakob (1463) | Won 0-0 | +181518 |
| 4modern | 572 | Davison, Stephen (1481) | Won 2-0 | +171535 |
| 5modern | 285 | Palmer, Austin (1659) | Lost 0-2 | -161519 |
| top | average opponent: 1525record: 2-3 | new rating: 1519 | ||
| Grand Prix Chicago 2014 (JOU standard) | starting rating: 1572 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 706 | Rosselli, Luca (1633) | Lost 1-2 | -171555 |
| 3standard | 841 | Novak, Tyler (1631) | Lost 1-2 | -171538 |
| 4standard | 927 | Kinkade, Tera (1481) | Won 2-1 | +171555 |
| 5standard | 730 | Sopcich, Scott (1542) | Lost 1-2 | -181537 |
| top | average opponent: 1572record: 1-3 | new rating: 1537 | ||
| Grand Prix Minneapolis 2014 (modern) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 539 | Sieg, Eric (1500) | Won 2-0 | +181517 |
| 2modern | 377 | Burzinski, Josh (1518) | Won 2-0 | +181535 |
| 3modern | 239 | Marfisi, Sarah (1561) | Lost 1-2 | -171518 |
| 4modern | 568 | Grgic, Alan (1536) | Won 2-0 | +181536 |
| 5modern | 372 | Berni, Roberto (1966) | Won 2-1 | +251561 |
| 6modern | 288 | Propson, Stephen (1600) | Lost 1-2 | -171544 |
| 7modern | 415 | Schafer, Gregory (1706) | Won 2-0 | +211565 |
| 8modern | 284 | Ingram, Peter (1886) | Lost 0-2 | -121553 |
| 9modern | 314 | Pounds, Robert (1607) | Won 2-1 | +191572 |
| top | average opponent: 1653record: 6-3 | new rating: 1572 | ||
| Grand Prix Oklahoma City 2013 (THS limited) | starting rating: 1456 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 116 | Dow, Jacob Paul (1500) | Won 2-1 | +181474 |
| 2sealed | 282 | Lively, Joey (1518) | Lost 0-2 | -171457 |
| 3sealed | 493 | Felber, Amanda (1409) | Won 2-0 | +171474 |
| 4sealed | 329 | Peterson, Gabriel (1482) | Lost 1-2 | -181456 |
| 5sealed | 451 | Shafer, Mathew J (1500) | Won 2-1 | +191475 |
| 6sealed | 342 | Zandi, Jeff (1623) | Won 2-0 | +211496 |
| 7sealed | 211 | Befroui, Dustin (1537) | Won 2-0 | +191515 |
| 8sealed | 193 | Gottstein, Jeff (1648) | Lost 0-2 | -161499 |
| top | average opponent: 1527record: 5-3 | new rating: 1499 | ||
| Grand Prix Chicago 2012 (modern) | starting rating: 1460 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 199 | Dilley, Andrew C (1531) | Won 2-0 | +191479 |
| 4modern | 106 | Cox, Patrick (1804) | Lost 0-2 | -121467 |
| 5modern | 122 | Duncan, Kyle A (1740) | Lost 1-2 | -131454 |
| 6modern | 287 | Antunes, Robert (1458) | Won 2-0 | +181472 |
| 7modern | 149 | Headley, David (1577) | Lost 1-2 | -161456 |
| top | average opponent: 1622record: 2-3 | new rating: 1456 | ||
| Grand Prix Minneapolis 2012 (AVR standard) | starting rating: 1471 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 42 | Woodward, Thomas (1585) | Lost 1-2 | -161455 |
| 4standard | 233 | Malone, Chris (1469) | Lost 0-2 | -181437 |
| 5standard | 381 | Scheel, Randy D (1499) | Won 2-1 | +191456 |
| 6standard | 221 | Lindseth, Steven (1465) | Won 2-1 | +181474 |
| 7standard | 165 | Rhodes, Marc (1540) | Lost 1-2 | -161458 |
| 8standard | 172 | Gable, Toby (1518) | Won 2-0 | +191477 |
| 9standard | 157 | Moen, Craig (1536) | Lost 1-2 | -171460 |
| top | average opponent: 1516record: 3-4 | new rating: 1460 | ||
| Grand Prix Lincoln 2012 (modern) | starting rating: 1523 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 58 | Little, Grant (1481) | Lost 0-2 | -181505 |
| 4modern | 128 | Ruan, Kai (1571) | Lost 1-2 | -171488 |
| 5modern | 202 | Edwardson, Timothy (1533) | Lost 0-2 | -171471 |
| top | average opponent: 1528record: 0-3 | new rating: 1471 | ||
| Grand Prix Minneapolis 2009 (ZEN limited) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 376 | Bolstad, Brandon (1500) | Won 2-0 | +181499 |
| 2sealed | 54 | Hart, Brian (1499) | Won 2-0 | +181517 |
| 3sealed | 42 | Ravitz, Joshua (1687) | Lost 0-2 | -151502 |
| 4sealed | 144 | Hansard, Brendon (1556) | Won 2-0 | +191521 |
| 5sealed | 174 | Germar, Richard (1580) | Lost 0-2 | -171504 |
| 6sealed | 282 | Wersal, Gunther (1472) | Won 2-0 | +181522 |
| 7sealed | 149 | Neufeld, Bryan (1615) | Won 2-1 | +191541 |
| 8sealed | 123 | Davy, Daniel T (1552) | Lost 0-2 | -181523 |
| top | average opponent: 1558record: 5-3 | new rating: 1523 | ||
| Grand Prix Chicago 2009 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 5 | Grawe, Scott (1500) | Draw 1-1 | 01500 |
| 2legacy | 328 | Hoffmeyer, Scott (1500) | Won 2-1 | +181518 |
| 3legacy | 219 | Krieger, Jesse (1490) | Lost 0-2 | -191499 |
| 4legacy | 394 | Hubbard, Karl (1500) | Won 2-1 | +191518 |
| 5legacy | 268 | Grant, Harry T (1500) | Lost 0-2 | -191499 |
| 6legacy | 345 | Lynch, John (1472) | Lost 0-2 | -181481 |
| top | average opponent: 1494record: 2-3-1 | new rating: 1481 | ||