Sumi, Kazuhiko
Current rating: 1595
Record: 18-13-1 (GP) / 4-3 (professional)
| Grand Prix Nagoya 2004 (5DN standard) | starting rating: 1626 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 22 | Suo, Yoshihisa (1500) | Won 2-1 | +161642 |
| 3standard | 155 | Fujitsuka, Shougo (1594) | Lost 0-2 | -191623 |
| 4standard | 137 | Nakada, Masahiro (1513) | Won 2-1 | +161639 |
| 5standard | 193 | Michitani, Tsunenobu (1601) | Won 2-0 | +171656 |
| 6standard | 37 | Fujimoto, Taichi (1542) | Lost 0-2 | -201636 |
| 7standard | 93 | Matsushima, Kouji (1433) | Lost 0-2 | -211615 |
| 8standard | 195 | Oonishi, Natsuki (1504) | Lost 1-2 | -201595 |
| top | average opponent: 1527record: 3-4 | new rating: 1595 | ||
| Grand Prix Sendai 2004 (DST limited) | starting rating: 1619 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 109 | Sutou, Takuo (1569) | Won 2-0 | +171636 |
| 3sealed | 21 | Yamamoto, Kentaro (1621) | Lost 0-2 | -181618 |
| 4sealed | 104 | Nakano, Fumiki (1585) | Won 2-1 | +171635 |
| 5sealed | 54 | Nakamura, Yoichi (1394) | Won 2-1 | +141649 |
| 6sealed | 37 | Sogabe, Ippei (1553) | Lost 0-2 | -201629 |
| 7sealed | 53 | Usuki, Ken (1549) | Won 2-0 | +171646 |
| 8sealed | 51 | Yamasaki, Ryo (1555) | Lost 0-2 | -201626 |
| top | average opponent: 1547record: 4-3 | new rating: 1626 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1583 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 96 | Ushie, Yuuta (1528) | Won 2-1 | +171600 |
| 3sealed | 94 | Watanabe, Tomosumi (1519) | Won 2-0 | +171617 |
| 4sealed | 59 | Chai, Royce Ming Huang (1781) | Lost 0-2 | -151602 |
| 5sealed | 83 | Ooshiro, Hideto (1614) | Lost 1-2 | -181584 |
| 6sealed | 92 | Takahasi, Tooru (1522) | Won 2-1 | +171601 |
| 7sealed | 95 | Ueno, Kazuki (1735) | Draw 1-1 | +21603 |
| 8sealed | 81 | Ozaki, Hironori (1495) | Won 2-0 | +161619 |
| top | average opponent: 1599record: 4-2-1 | new rating: 1619 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1564 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 54 | Okabayashi, Masanao (1626) | Lost 0-2 | -171547 |
| 5sealed | 57 | Nakashima, Hisatomo (1520) | Lost 1-2 | -181529 |
| 6sealed | 99 | Yamagishi, Hajime (1577) | Won 2-1 | +181547 |
| 7sealed | 98 | Mori, Atsushi (1533) | Won 2-0 | +181565 |
| 8sealed | 58 | Kakita, Masashi (1558) | Won 2-0 | +181583 |
| top | average opponent: 1563record: 3-2 | new rating: 1583 | ||
| Grand Prix Kyoto 2000 (extended) | starting rating: 1528 | |||
| round | table | opponent (rating) | result | Δrating |
| 3extended | 32 | Takayama, Reona (1518) | Lost 0-2 | -181510 |
| 4extended | 181 | Sumita, Masanobu (1531) | Won 2-1 | +181528 |
| 5extended | 61 | Yamahara, Toshihisa (1522) | Lost 1-2 | -181510 |
| 6extended | 174 | Oda, Shinsuke (1518) | Won 2-0 | +181528 |
| 7extended | 90 | Nakagawa, Koichi (1502) | Won 2-0 | +181546 |
| 8extended | 37 | Suzuki, Kentaro (1553) | Won 2-1 | +181564 |
| top | average opponent: 1524record: 4-2 | new rating: 1564 | ||
| Pro Tour Los Angeles 2000 (MMQ draft) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1draft | 116 | Towry, Dustin (1500) | Won 1-0 | +181518 |
| 2draft | 141 | Romao, Carlos (1454) | Lost 1-2 | -191499 |
| 3draft | 55 | Parker, Brock (1487) | Lost 0-2 | -181481 |
| 4draft | 121 | Makuz, Marco (1586) | Won 2-1 | +201501 |
| 5draft | 91 | Reeves, Neil (1478) | Lost 0-2 | -191482 |
| 6draft | 93 | Fuentes, Hector (1714) | Won 2-1 | +221504 |
| 7draft | 70 | Slemr, Jakub (1830) | Won 2-0 | +241528 |
| top | average opponent: 1578record: 4-3 | new rating: 1528 | ||