Koski, Sampo
Current rating: 1709 (#5963)
Record: 39-26
| Grand Prix Utrecht 2019 (ELD limited) | starting rating: 1738 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 523 | Orlovskiy, Alexey (1500) | Won 2-0 | +141752 |
| 2sealed | 431 | Widmer, Lorenz (1700) | Lost 0-2 | -191733 |
| 3sealed | 429 | Hartmann, Charly (1527) | Won 2-0 | +141747 |
| 4sealed | 436 | Hendriksen, Koen (1519) | Won 2-0 | +141761 |
| 5sealed | 132 | Brand, Anjo (1565) | Lost 0-2 | -211740 |
| 6sealed | 284 | Papadakis, Angelos (1486) | Lost 1-2 | -231717 |
| 7sealed | 326 | Schroeder, Yann (1670) | Lost 0-2 | -191698 |
| 8sealed | 318 | Lhomme, Steeve (1287) | Won 2-0 | +111709 |
| top | average opponent: 1532record: 4-4 | new rating: 1709 | ||
| Grand Prix Copenhagen 2019 (MH1 limited) | starting rating: 1696 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 151 | Aktor, Thomas (1500) | Won 2-1 | +141710 |
| 2sealed | 213 | Wellinger, Serafin (2065) | Won 2-0 | +241734 |
| 3sealed | 123 | Engelsdorfer, Fabian (1593) | Won 2-1 | +161750 |
| 4sealed | 123 | Richards, Branoc (1649) | Lost 1-2 | -201730 |
| 5sealed | 171 | Hoogstraten, Mark (1697) | Won 2-1 | +171747 |
| 6sealed | 74 | Ortiz, Roberto (1557) | Won 2-1 | +151762 |
| 7sealed | 82 | Meulders, Bram (1778) | Lost 0-2 | -181744 |
| 8sealed | 153 | Carli Maltinti, Lorenzo (1629) | Won 2-0 | +161760 |
| 9sealed | 97 | Hensing, Marcus (1879) | Lost 1-2 | -161744 |
| 10draft | 78 | Vinci, Stefano (1890) | Lost 0-0 | -151729 |
| 11draft | 121 | Aklundh, Jens (1542) | Won 2-1 | +151744 |
| 12draft | 100 | Kaitila, Aleksi (1620) | Won 2-1 | +151759 |
| 13draft | 47 | Tedeschi, Davide (1587) | Lost 1-2 | -211738 |
| 14draft | 40 | Garnham, Matthew (1806) | Won 2-0 | +191757 |
| 15draft | 42 | Ackermann, Felix (1679) | Lost 1-2 | -191738 |
| top | average opponent: 1698record: 9-6 | new rating: 1738 | ||
| Grand Prix Warsaw 2018 (GRN limited) | starting rating: 1670 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 91 | Medvedev, Konstantin (1500) | Won 2-1 | +151685 |
| 2sealed | 172 | Kiss, Laszlo (1615) | Lost 0-2 | -201665 |
| 3sealed | 524 | Muller, Lukas (1672) | Won 2-1 | +191684 |
| 4sealed | 539 | Koivisto, Antti (1495) | Lost 0-2 | -221662 |
| 5sealed | 654 | Steudtner, Christian (1732) | Won 2-1 | +191681 |
| 6sealed | 462 | Ludena, David (1494) | Won 2-0 | +151696 |
| 7sealed | 318 | Belova, Zoya (1633) | Won 2-0 | +171713 |
| 8sealed | 127 | Geffroy, Francois (1755) | Lost 0-2 | -171696 |
| top | average opponent: 1612record: 5-3 | new rating: 1696 | ||
| Grand Prix Prague 2017 (AER limited) | starting rating: 1550 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 211 | Davidson, Hans (1500) | Won 2-0 | +171567 |
| 2sealed | 237 | Krc, Ales (1501) | Won 2-1 | +161583 |
| 3sealed | 231 | Dillon, Wayne (1674) | Won 2-0 | +201603 |
| 4sealed | 176 | Saito, Tomoharu (2061) | Won 2-0 | +261629 |
| 5sealed | 75 | Liu, Yuchen (1984) | Won 2-0 | +241653 |
| 6sealed | 39 | Ulke, Dominic (1754) | Won 2-0 | +201673 |
| 7sealed | 10 | Rus, Tine (1856) | Won 2-0 | +211694 |
| 8sealed | 14 | Strobl, Manuel (1477) | Won 2-0 | +141708 |
| 9sealed | 6 | Sandrin, Ryan (1716) | Lost 1-2 | -171691 |
| 10draft | 81 | Oehler, Martin (1648) | Won 2-0 | +171708 |
| 11draft | 80 | Vieren, Peter (2004) | Won 2-1 | +231731 |
| 12draft | 80 | Metsa, Roope (1623) | Lost 0-2 | -201711 |
| 13draft | 144 | Hugony, Francesco (1894) | Lost 1-2 | -151696 |
| 14draft | 68 | Vieren, Peter (1977) | Lost 1-2 | -131683 |
| 15draft | 119 | Mines, David (1933) | Lost 0-2 | -131670 |
| top | average opponent: 1774record: 10-5 | new rating: 1670 | ||
| Grand Prix Helsinki 2004 (COK limited) | starting rating: 1576 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 57 | Wikstrom, Mikael (1451) | Lost 0-2 | -201556 |
| 2sealed | 141 | Tulppala, Eero (1482) | Lost 1-2 | -191537 |
| 3sealed | 174 | Rydningen, Oystein (1465) | Won 2-0 | +161553 |
| 4sealed | 168 | Hautoriemi, Antti (1482) | Won 2-0 | +171570 |
| 5sealed | 133 | Andrejchikov, Denis (1500) | Lost 0-2 | -191551 |
| 6sealed | 145 | Kurttio, Anttu (1481) | Won 2-0 | +171568 |
| 7sealed | 117 | Lehtonen, Eetu (1567) | Lost 0-2 | -181550 |
| top | average opponent: 1490record: 3-4 | new rating: 1550 | ||
| Grand Prix Helsinki 2000 (INV limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 133 | Junnilainen, Timo (1500) | Won 2-1 | +181518 |
| 2sealed | 15 | Lehtinen, Perttu (1518) | Won 2-0 | +181536 |
| 3sealed | 9 | Jedefeldt, Patrick (1518) | Won 2-1 | +181554 |
| 4sealed | 29 | Tikkakoski, Antti (1554) | Lost 1-2 | -181536 |
| 5sealed | 64 | Hiltunen, Jussi (1536) | Won 2-0 | +181554 |
| 6sealed | 22 | Hakanpaa, Mikko (1555) | Won 0-0 | +181572 |
| 7sealed | 17 | Wall, Mike (1674) | ID | 01572 |
| 8rochester | 14 | Enstrom, Dan (1571) | Lost 0-2 | -181554 |
| 9rochester | 26 | Kalliomaki, Kalle (1522) | Lost 1-2 | -191535 |
| 10rochester | 20 | Bjork, Artturi (1525) | Won 2-0 | +181553 |
| 11rochester | 24 | Rosenstrom, Tom (1556) | Won 2-1 | +181571 |
| 12rochester | 18 | Ronaldson, Ben (1761) | Lost 0-2 | -151556 |
| 13rochester | 22 | Courtois, Frederic (1662) | Won 2-1 | +201576 |
| top | average opponent: 1573record: 8-4-1 | new rating: 1576 | ||