| # | Name | Elo | Total | Country | Rank |
| 2501. | sideshowbob | 2355 | 428 |
|
Talent |
| 2502. | sidewinderdenny | 2404 | 568 | - | |
| 2503. | siefert | 1958 | 63750 | Experienced Player | |
| 2504. | siegbert | 2511 | 11090 |
|
Internat. Master |
| 2505. | sieger58 | 1969 | 7900 | Club Champion | |
| 2506. | silbertaler | 2146 | 935 | Shooting Star | |
| 2507. | silencepawn | 2228 | 114 | Beginner | |
| 2508. | silent move | 3420 | 7543 | World Champion | |
| 2509. | simbaknight | 2301 | 433 | Talent | |
| 2510. | simon1994 | 1736 | 11 | - | |
| 2511. | simone261 | 1932 | 19 |
|
- |
| 2512. | simonska27 | 1559 | 4 | - | |
| 2513. | singscheidt | 1903 | 149 | Strong Amateur | |
| 2514. | sinnedair | 1987 | 133 | Strong Amateur | |
| 2515. | siva143 | 1745 | 11 | - | |
| 2516. | sivamurugan | 2432 | 1434 | Shooting Star | |
| 2517. | siyuanlu | 2500 | 10880 | - | |
| 2518. | sjo smeets | 2307 | 221 | Strong Amateur | |
| 2519. | sjturmo | 2370 | 437 | Strong Amateur | |
| 2520. | skakicl | 2266 | 1746 | Shooting Star | |
| 2521. | skatkat | 2079 | 210 |
|
Apprentice |
| 2522. | skebi | 2262 | 54294 | FIDE Master | |
| 2523. | skill-less | 2651 | 7559 |
|
Grandmaster |
| 2524. | sks1130 | 2416 | 2347 |
|
Top Player |
| 2525. | sky19 | 2386 | 2050 | Brilliant Player |
| # | Name | Elo | Total | Country | Rank |
| 2526. | skyerwin | 2475 | 70106 | Internat. Master | |
| 2527. | slakibuki | 2450 | 39272 |
|
Internat. Master |
| 2528. | slamvex | 2018 | 72 | Beginner | |
| 2529. | slowmover | 1995 | 47 | Beginner | |
| 2530. | slugger | 2460 | 89917 | Internat. Master | |
| 2531. | sly111 | 2216 | 5301 | Master Candidate | |
| 2532. | smartmudabbir | 1997 | 50 | - | |
| 2533. | smgsupremacy1234 | 1529 | 44 | Beginner | |
| 2534. | smikush | 2220 | 275 | Apprentice | |
| 2535. | smog | 2441 | 6529 |
|
Internat. Master |
| 2536. | snanopoulos | 2128 | 138 | Strong Amateur | |
| 2537. | sniperchess14 | 2347 | 4270 |
|
FIDE Master |
| 2538. | snofru | 2505 | 350029 | Internat. Master | |
| 2539. | snoka | 2289 | 169 | Strong Amateur | |
| 2540. | snubbing | 2364 | 137 | Beginner | |
| 2541. | soberphobia | 2334 | 6759 | FIDE Master | |
| 2542. | socrates2015 | 2068 | 4882 | Top Player | |
| 2543. | sogel | 2228 | 3221 | Top Player | |
| 2544. | sohuphidi | 2619 | 9633 | Grandmaster | |
| 2545. | sokatan | 2187 | 1053 | Shooting Star | |
| 2546. | sokraminc | 2466 | 21439 | Internat. Master | |
| 2547. | soler-b | 2552 | 8703 | Internat. Master | |
| 2548. | solide | 2362 | 14383 | FIDE Master | |
| 2549. | somaclava | 2597 | 61960 | Grandmaster | |
| 2550. | sonroh | 2216 | 2537 |
|
Master Candidate |