| T160-D00LSS· May 16 – 22, 2021 | May 16 – 22, 2021 | Classical | 7 | 1625 | 30 |
Amir Cup Rapid 2021 St Petersburg RUS· May 22, 2021 | May 22, 2021 | Rapid | 61 | 1980 | 108 |
| OP-05142LSS· May 20 – 21, 2021 | May 20 – 21, 2021 | Classical | 6 | 1556 | 8 |
4. Vezerkepzo IM 2021 Budapest HUN· May 13 – 21, 2021 | May 13 – 21, 2021 | Classical | 10 | 2243 | 45 |
2. Chartres GM 2021 Chartres FRA· May 17 – 21, 2021 | May 17 – 21, 2021 | Classical | 10 | 2442 | 45 |
4. Vezerkepzo GM 2021 Budapest HUN· May 13 – 21, 2021 | May 13 – 21, 2021 | Classical | 10 | 2370 | 39 |
| T161-E03LSS· May 20, 2021 | May 20, 2021 | Classical | 7 | 1851 | 32 |
Superliga E Kosoves 2021 Prishtina KOS· May 16 – 20, 2021 | May 16 – 20, 2021 | Classical | 49 | 2132 | 93 |
| FICGS__CHESS__RAPID_B__000361FICGS· May 19, 2021 | May 19, 2021 | Classical | 5 | 1819 | 6 |
| FICGS__CHESS__CLASS_B__000341FICGS· May 19, 2021 | May 19, 2021 | Classical | 5 | 1744 | 10 |
75. ch-AZE Final 2021 Nakhchivan AZE· May 15 – 18, 2021 | May 15 – 18, 2021 | Classical | 4 | 2349 | 14 |
| OP-05140LSS· May 16 – 18, 2021 | May 16 – 18, 2021 | Classical | 5 | 1675 | 9 |
| ST-00190LSS· May 11 – 18, 2021 | May 11 – 18, 2021 | Classical | 8 | 2161 | 25 |
| T158-C33LSS· May 10 – 17, 2021 | May 10 – 17, 2021 | Classical | 7 | 1903 | 34 |
Mykolaiv GM May 2021 Mykolaiv UKR· May 11 – 17, 2021 | May 11 – 17, 2021 | Classical | 11 | 2290 | 52 |
| SA-00758LSS· May 9 – 17, 2021 | May 9 – 17, 2021 | Classical | 8 | 2073 | 27 |
| SB-00614LSS· Apr 28 – May 17, 2021 | Apr 28 – May 17, 2021 | Classical | 7 | 1823 | 19 |
Budva GM Mix 2021 Budva MNE· May 11 – 17, 2021 | May 11 – 17, 2021 | Classical | 16 | 2223 | 69 |
| SLO On/L World Cup QFinalTornelo INT· May 16, 2021 | May 16, 2021 | Classical | 2 | 2507 | 5 |
MNE World Cup Eliminator Budva MNE· May 13 – 16, 2021 | May 13 – 16, 2021 | Classical | 4 | 2442 | 8 |
| We 42. Kalakukko A 2021· May 15 – 16, 2021 | May 15 – 16, 2021 | Classical | 9 | 1983 | 6 |
TCh-LTU 2021 Lithuania LTU· May 7 – 16, 2021 | May 7 – 16, 2021 | Classical | 87 | 2048 | 131 |
87. ch-BLR 2021 Minsk BLR· May 8 – 16, 2021 | May 8 – 16, 2021 | Classical | 17 | 2325 | 38 |
2. Koege Weekend EMT 2021 Koge DEN· May 14 – 16, 2021 | May 14 – 16, 2021 | Classical | 22 | 2198 | 50 |
TCh-ISL Div 1 2019-20 Reykjavik ISL· May 14 – 16, 2021 | May 14 – 16, 2021 | Classical | 103 | 2024 | 155 |
POL Ch Academic Team 2021 Chorzow POL· May 15 – 16, 2021 | May 15 – 16, 2021 | Classical | 120 | 1940 | 212 |
POL Ch Academic women Chorzow POL· May 14 – 15, 2021 | May 14 – 15, 2021 | Classical | 40 | 1881 | 62 |
CHN Ch Women 2021 Xinghua CHN· May 7 – 15, 2021 | May 7 – 15, 2021 | Classical | 14 | 2261 | 66 |
| Slovak Hybrid Teams 2021Tornelo INT· May 13 – 15, 2021 | May 13 – 15, 2021 | Classical | 33 | 2166 | 60 |
CHN Ch 2021 Xinghua CHN· May 7 – 15, 2021 | May 7 – 15, 2021 | Classical | 11 | 2599 | 63 |
POL Ch Academic Men 2021 Chorzow POL· May 14 – 15, 2021 | May 14 – 15, 2021 | Classical | 111 | 1941 | 190 |
Zonal 3.4 2021 Tashkent UZB· May 7 – 15, 2021 | May 7 – 15, 2021 | Classical | 29 | 2269 | 89 |
| T157-E77LSS· May 8 – 14, 2021 | May 8 – 14, 2021 | Classical | 7 | 1877 | 29 |
| OP-05139LSS· May 14, 2021 | May 14, 2021 | Classical | 7 | 1496 | 6 |
| RB-00402LSS· Apr 28 – May 14, 2021 | Apr 28 – May 14, 2021 | Classical | 8 | 1866 | 21 |
75. ch-AZE Prelim 2021 Nakhchivan AZE· May 4 – 14, 2021 | May 4 – 14, 2021 | Classical | 12 | 2339 | 63 |
| FICGS__CHESS__CLASS_A__000247FICGS· May 13, 2021 | May 13, 2021 | Classical | 7 | 2000 | 20 |
| FICGS__CHESS__RAPID_A__000269FICGS· May 13, 2021 | May 13, 2021 | Classical | 7 | 1995 | 20 |
XIV Closed IM Barcelona Barcelona ESP· May 3 – 12, 2021 | May 3 – 12, 2021 | Classical | 10 | 2309 | 42 |
XV Closed IM Barcelona Barcelona ESP· May 3 – 12, 2021 | May 3 – 12, 2021 | Classical | 10 | 2307 | 44 |
TCh-UKR 2021 Lvov UKR· May 9 – 12, 2021 | May 9 – 12, 2021 | Classical | 44 | 2225 | 48 |
| SM-00445LSS· May 9 – 12, 2021 | May 9 – 12, 2021 | Classical | 8 | 2210 | 27 |
FSGM May 2021 Budapest HUN· May 2 – 11, 2021 | May 2 – 11, 2021 | Classical | 11 | 2318 | 47 |
FSIM May 2021 Budapest HUN· May 2 – 11, 2021 | May 2 – 11, 2021 | Classical | 10 | 2270 | 45 |
TCh-RUS HL 2021 Sochi RUS· May 2 – 10, 2021 | May 2 – 10, 2021 | Classical | 73 | 2259 | 128 |
TCh-RUS Premier 2021 Sochi RUS· May 2 – 10, 2021 | May 2 – 10, 2021 | Classical | 67 | 2494 | 223 |
73. ch-MNE 2021 Podgorica MNE· May 3 – 10, 2021 | May 3 – 10, 2021 | Classical | 35 | 2087 | 150 |
TCh-RUS Women 2021 Sochi RUS· May 2 – 10, 2021 | May 2 – 10, 2021 | Classical | 50 | 2240 | 99 |
I Fenamac Efideporte GpB Mexico City MEX· May 5 – 9, 2021 | May 5 – 9, 2021 | Classical | 10 | 2287 | 39 |
ch-SRB U18 2021 Subotica SRB· May 3 – 9, 2021 | May 3 – 9, 2021 | Classical | 10 | 1860 | 25 |