| # | Name | Elo | Total | Country | Rank |
| 4801. | siddhideshmukh | 2229 | 1210 | Shooting Star | |
| 4802. | sids10 | 2517 | 4617 | Internat. Master | |
| 4803. | sidved | 2254 | 531 | Talent | |
| 4804. | siefert | 1955 | 65460 | Experienced Player | |
| 4805. | siegbert | 2445 | 13333 | Grandmaster | |
| 4806. | sieger58 | 1919 | 8068 | Club Champion | |
| 4807. | siegfried1965 | 2038 | 84 | Amateur | |
| 4808. | siggi04 | 1985 | 48 |
|
Beginner |
| 4809. | sigi | 1925 | 26 | Beginner | |
| 4810. | signorgius | 2073 | 193 | - | |
| 4811. | siimkanep | 2355 | 155 | Beginner | |
| 4812. | sikayules | 2123 | 125 | Strong Amateur | |
| 4813. | silencepawn | 2249 | 182 | Beginner | |
| 4814. | silent move | 3424 | 7626 | World Champion | |
| 4815. | silent_knight123 | 1662 | 6 | - | |
| 4816. | sillygooselook | 1732 | 38 | Beginner | |
| 4817. | sillymove | 2257 | 569 |
|
- |
| 4818. | silv3rbuck | 1699 | 6 | - | |
| 4819. | silverstonefox | 2029 | 81 |
|
Amateur |
| 4820. | silviuch | 1971 | 49 | Beginner | |
| 4821. | sim23em | 2192 | 646 | Player | |
| 4822. | simmideopa | 1667 | 109 | Amateur | |
| 4823. | simon lichtinger | 2352 | 158 | Amateur | |
| 4824. | simonrosberg | 1872 | 116 | - | |
| 4825. | sinatra | 2194 | 132 | Strong Amateur |
| # | Name | Elo | Total | Country | Rank |
| 4826. | sinco | 2288 | 873 |
|
Shooting Star |
| 4827. | sinexxx | 1782 | 10 | - | |
| 4828. | singular1ty81 | 1804 | 57 | Beginner | |
| 4829. | sinned | 1942 | 261 | - | |
| 4830. | sionliness | 1590 | 6 | - | |
| 4831. | sir | 1592 | 9 | - | |
| 4832. | sir alfred | 2429 | 798 | - | |
| 4833. | sirgabrieltheiv | 2154 | 381 | Strong Apprentice | |
| 4834. | sirhenry | 1733 | 69 | Beginner | |
| 4835. | siri55 | 1944 | 32 | Beginner | |
| 4836. | sirius1504 | 2561 | 7811 | Grandmaster | |
| 4837. | sirlocks | 2108 | 326 | Strong Apprentice | |
| 4838. | siva d | 1800 | 66 | Beginner | |
| 4839. | siva143 | 1822 | 16 | - | |
| 4840. | siwok16 | 2058 | 101 | Amateur | |
| 4841. | sixoone | 2089 | 3983 | - | |
| 4842. | sjaubert | 1606 | 5 | - | |
| 4843. | skakibridge13 | 1819 | 16 | - | |
| 4844. | skakspiller2016 | 2403 | 24290 | Internat. Master | |
| 4845. | skalkotas | 1647 | 15 | - | |
| 4846. | skebi | 2254 | 69174 | FIDE Master | |
| 4847. | skipdever | 2281 | 10498 | FIDE Master | |
| 4848. | sknexus | 2401 | 1793 | - | |
| 4849. | skotwal | 1681 | 14 | - | |
| 4850. | skrajput05 | 1618 | 17 | - |