TCh-AUT 2. Ost 2021-22 Austria AUT· Oct 16 – 17, 2021 | Oct 16 – 17, 2021 | Classical | 79 | 2144 | 71 |
Odensemesterskabet 2021 Mester 2 Odense DEN· Oct 15 – 17, 2021 | Oct 15 – 17, 2021 | Classical | 6 | 2121 | 14 |
Odensemesterskabet 2021 Odense DEN· Oct 15 – 17, 2021 | Oct 15 – 17, 2021 | Classical | 6 | 2337 | 15 |
TCh-AUT 2. West 2021-22 Austria AUT· Oct 15 – 17, 2021 | Oct 15 – 17, 2021 | Classical | 97 | 2156 | 114 |
TCh-ESP Div Honor 2021 Toledo ESP· Oct 11 – 17, 2021 | Oct 11 – 17, 2021 | Classical | 56 | 2500 | 180 |
Bundesliga 2019-20 Berlin GER· Oct 13 – 17, 2021 | Oct 13 – 17, 2021 | Classical | 175 | 2446 | 420 |
Fagernes GM Open 2021 Fagernes NOR· Oct 10 – 17, 2021 | Oct 10 – 17, 2021 | Classical | 72 | 2159 | 318 |
43. Arco Open 2021 Arco ITA· Oct 9 – 17, 2021 | Oct 9 – 17, 2021 | Classical | 142 | 1875 | 422 |
| JSM 2. div. 2020-22Espoo· Oct 16, 2021 | Oct 16, 2021 | Classical | 10 | 1900 | 5 |
| JSM 2. div. 2020-22Vaasa· Aug 21 – Oct 16, 2021 | Aug 21 – Oct 16, 2021 | Classical | 23 | 1835 | 15 |
TCh-RUS Rapid w 2021 Sochi RUS· Oct 15 – 16, 2021 | Oct 15 – 16, 2021 | Rapid | 46 | 2091 | 70 |
TCh-RUS Rapid 2021 Sochi RUS· Oct 15 – 16, 2021 | Oct 15 – 16, 2021 | Rapid | 98 | 2308 | 179 |
| ST-00201LSS· Oct 3 – 15, 2021 | Oct 3 – 15, 2021 | Classical | 9 | 2369 | 32 |
| SB-00623LSS· Oct 3 – 15, 2021 | Oct 3 – 15, 2021 | Classical | 7 | 1870 | 21 |
38. Muensterland Open Muenster GER· Oct 8 – 15, 2021 | Oct 8 – 15, 2021 | Classical | 55 | 2057 | 88 |
31. NATO Chess 2021 Blankenberge BEL· Oct 11 – 15, 2021 | Oct 11 – 15, 2021 | Classical | 104 | 1960 | 356 |
| OP-05199LSS· Oct 13 – 14, 2021 | Oct 13 – 14, 2021 | Classical | 4 | 1777 | 5 |
TCh-RUS Blitz w 2021 Sochi RUS· Oct 14, 2021 | Oct 14, 2021 | Blitz | 51 | 2084 | 88 |
TCh-RUS Blitz 2021 Sochi RUS· Oct 14, 2021 | Oct 14, 2021 | Blitz | 100 | 2316 | 260 |
| RB-00408LSS· Oct 10 – 13, 2021 | Oct 10 – 13, 2021 | Classical | 9 | 1956 | 31 |
| RA-00690LSS· Oct 10 – 13, 2021 | Oct 10 – 13, 2021 | Classical | 7 | 2042 | 21 |
Tournament of Peace 2021 Zagreb CRO· Oct 5 – 13, 2021 | Oct 5 – 13, 2021 | Classical | 11 | 2481 | 54 |
RUS Ch Rapid w 2021 Sochi RUS· Oct 12 – 13, 2021 | Oct 12 – 13, 2021 | Rapid | 39 | 2172 | 64 |
RUS Ch Rapid 2021 Sochi RUS· Oct 12 – 13, 2021 | Oct 12 – 13, 2021 | Rapid | 112 | 2303 | 274 |
| OP-05198LSS· Oct 12, 2021 | Oct 12, 2021 | Classical | 6 | 1059 | 5 |
ChessMood Open 2021 Tsaghkadzor ARM· Oct 4 – 12, 2021 | Oct 4 – 12, 2021 | Classical | 61 | 2385 | 110 |
FSGM October 2021 Budapest HUN· Oct 4 – 12, 2021 | Oct 4 – 12, 2021 | Classical | 10 | 2322 | 40 |
Belgrade Premier League Belgrade SRB· Oct 2 – 12, 2021 | Oct 2 – 12, 2021 | Classical | 110 | 2072 | 384 |
La Nucia Open 2021 La Nucia ESP· Oct 6 – 12, 2021 | Oct 6 – 12, 2021 | Classical | 44 | 2305 | 93 |
FSIM October 2021 Budapest HUN· Oct 2 – 12, 2021 | Oct 2 – 12, 2021 | Classical | 6 | 2224 | 26 |
British Columbia Ch Victoria CAN· Oct 2 – 11, 2021 | Oct 2 – 11, 2021 | Classical | 8 | 2067 | 25 |
| SA-00774LSS· Oct 2 – 11, 2021 | Oct 2 – 11, 2021 | Classical | 7 | 2040 | 21 |
62. USAFOCC VOC Grapevine USA· Oct 9 – 11, 2021 | Oct 9 – 11, 2021 | Classical | 22 | 1514 | 44 |
RUS Ch Blitz w 2021 Sochi RUS· Oct 11, 2021 | Oct 11, 2021 | Blitz | 39 | 2165 | 72 |
RUS Ch Blitz 2021 Sochi RUS· Oct 11, 2021 | Oct 11, 2021 | Blitz | 113 | 2312 | 287 |
62. USAFOCC AFO Grapevine USA· Oct 9 – 11, 2021 | Oct 9 – 11, 2021 | Classical | 51 | 1789 | 119 |
| OP-05192LSS· Sep 27 – Oct 10, 2021 | Sep 27 – Oct 10, 2021 | Classical | 5 | 1524 | 7 |
| We Salo 2021· Oct 9 – 10, 2021 | Oct 9 – 10, 2021 | Classical | 9 | 2052 | 8 |
48. Greek Team Championship (Group 2) Thessaloniki GRE· Oct 5 – 10, 2021 | Oct 5 – 10, 2021 | Classical | 114 | 1940 | 89 |
ZZSzach President IM 2021 Lazy POL· Oct 4 – 10, 2021 | Oct 4 – 10, 2021 | Classical | 10 | 2295 | 45 |
TCh-ROU Superliga women Mamaia ROU· Oct 2 – 10, 2021 | Oct 2 – 10, 2021 | Classical | 29 | 1990 | 126 |
| GBR-ch107 Over 50Milton Keynes· Oct 4 – 10, 2021 | Oct 4 – 10, 2021 | Classical | 19 | 1963 | 54 |
British OTB Championship Hull ENG· Oct 2 – 10, 2021 | Oct 2 – 10, 2021 | Classical | 22 | 2099 | 86 |
| GBR-ch107 Over 65Milton Keynes· Oct 4 – 10, 2021 | Oct 4 – 10, 2021 | Classical | 21 | 1874 | 65 |
Romanian Teams 1. League Mamaia ROU· Oct 2 – 10, 2021 | Oct 2 – 10, 2021 | Classical | 81 | 2311 | 329 |
TCh-ESP Rapid 2021 Ciudad Real ESP· Oct 9 – 10, 2021 | Oct 9 – 10, 2021 | Rapid | 126 | 2224 | 222 |
TCh-POL Ekstraliga 2021 Legnica POL· Oct 2 – 10, 2021 | Oct 2 – 10, 2021 | Classical | 75 | 2417 | 276 |
48. TCh-GRE Group 2 2021 Thessaloniki GRE· Oct 5 – 10, 2021 | Oct 5 – 10, 2021 | Classical | 146 | 1876 | 247 |
| T194-D80LSS· Oct 7 – 9, 2021 | Oct 7 – 9, 2021 | Classical | 8 | 2188 | 38 |
| RB-00407LSS· Sep 12 – Oct 9, 2021 | Sep 12 – Oct 9, 2021 | Classical | 7 | 1845 | 21 |