| # | Name | Elo | Total | Country | Rank |
| 2001. | nurkuti | 2101 | 19028 | Top Player | |
| 2002. | nuss56 | 2247 | 245805 | FIDE Master | |
| 2003. | nvclassic | 2742 | 16418 | World Champion | |
| 2004. | nvosloo | 2570 | 5881 | Internat. Master | |
| 2005. | nyrav1567 | 2524 | 749 |
|
Shooting Star |
| 2006. | oachkatzlschwoaf | 2048 | 109 |
|
Amateur |
| 2007. | obbi | 2116 | 1625 | Shooting Star | |
| 2008. | oberzocker | 2199 | 3063 | Master Candidate | |
| 2009. | octop | 1619 | 1261 | Strong Player | |
| 2010. | oddsocksoddmind | 1840 | 18 | - | |
| 2011. | oehme | 2393 | 13950 | FIDE Master | |
| 2012. | offenback | 2561 | 526 | Amateur | |
| 2013. | ogz | 2382 | 367 | Beginner | |
| 2014. | ohc57 | 1638 | 3 |
|
- |
| 2015. | oivjak | 1902 | 22 | Beginner | |
| 2016. | okguys | 1895 | 1482 | Shooting Star | |
| 2017. | olbrys | 1947 | 42 | Beginner | |
| 2018. | old hand | 2454 | 194 | Beginner | |
| 2019. | olderguy | 2204 | 15818 |
|
Master Candidate |
| 2020. | oldhiker450 | 2274 | 442 | Talent | |
| 2021. | oldie58 | 2322 | 4891 | FIDE Master | |
| 2022. | oldlucky | 1980 | 4874 | Club Champion | |
| 2023. | oldtop | 2060 | 12497 | Top Player | |
| 2024. | oldwin | 2100 | 919 |
|
Shooting Star |
| 2025. | olga 2005 | 2694 | 7205 | Grandmaster |
| # | Name | Elo | Total | Country | Rank |
| 2026. | oliver 123 | 2352 | 11216 | FIDE Master | |
| 2027. | oliver becker | 2505 | 35754 |
|
Grandmaster |
| 2028. | oliver reeh | 2900 | 350146 | World Champion | |
| 2029. | olli221074 | 2155 | 1889 | Club Champion | |
| 2030. | olohijie22 | 2485 | 1151 |
|
Shooting Star |
| 2031. | omid4220 | 2667 | 3716 |
|
Grandmaster |
| 2032. | omkargopikrishna | 2295 | 147 | Amateur | |
| 2033. | omogolo nkwe-15 | 2103 | 70 |
|
Beginner |
| 2034. | omosanni | 2425 | 628 | Talent | |
| 2035. | oneplus | 1761 | 52 |
|
Beginner |
| 2036. | onkel3000 | 2034 | 1434 | Attacking Player | |
| 2037. | onnootje | 2540 | 6334 | Internat. Master | |
| 2038. | opa304 | 2452 | 103631 | Internat. Master | |
| 2039. | orebrook | 2380 | 2514 |
|
FIDE Master |
| 2040. | ortwin | 2350 | 3684 | FIDE Master | |
| 2041. | osamaelwakeel | 2099 | 270 | Strong Amateur | |
| 2042. | osamasalem | 1962 | 32 | Beginner | |
| 2043. | osmantiric | 2271 | 298 | - | |
| 2044. | ostarhild | 2209 | 5843 | Master Candidate | |
| 2045. | osvalds | 2320 | 80860 |
|
FIDE Master |
| 2046. | otmar miggelt | 2378 | 21576 | FIDE Master | |
| 2047. | ototo79 | 1873 | 25 | Beginner | |
| 2048. | ottogt | 2330 | 30564 | FIDE Master | |
| 2049. | ottomansaint | 2113 | 3784 | Top Player | |
| 2050. | ottovanvliet | 1772 | 21 | Beginner |