| QM-00095LSS· Apr 12 – 14, 2021 | Apr 12 – 14, 2021 | Classical | 4 | 2238 | 12 |
I Blechzin Memorial 2021 St Petersburg RUS· Apr 13 – 14, 2021 | Apr 13 – 14, 2021 | Classical | 10 | 2570 | 45 |
4. Closed GM Barcelona Barcelona ESP· Apr 5 – 13, 2021 | Apr 5 – 13, 2021 | Classical | 10 | 2442 | 45 |
FSIM April 2021 Budapest HUN· Apr 3 – 13, 2021 | Apr 3 – 13, 2021 | Classical | 10 | 2268 | 42 |
FSGM April 2021 Budapest HUN· Apr 3 – 13, 2021 | Apr 3 – 13, 2021 | Classical | 10 | 2392 | 43 |
XIII Closed IM Barcelona Barcelona ESP· Apr 5 – 13, 2021 | Apr 5 – 13, 2021 | Classical | 10 | 2298 | 43 |
Third Sat Mix 200 2021 Novi Sad SRB· Apr 7 – 13, 2021 | Apr 7 – 13, 2021 | Classical | 18 | 2348 | 75 |
| T147-D43LSS· Apr 12, 2021 | Apr 12, 2021 | Classical | 5 | 2154 | 20 |
Portuguese Honra 2021 Fatima POR· Apr 6 – 12, 2021 | Apr 6 – 12, 2021 | Classical | 12 | 1809 | 44 |
| FICGS__CHESS__CLASS_A__000245FICGS· Apr 12, 2021 | Apr 12, 2021 | Classical | 8 | 1948 | 27 |
Portuguese Masters 2021 Fatima POR· Apr 6 – 12, 2021 | Apr 6 – 12, 2021 | Classical | 12 | 2169 | 59 |
TCh-AUT 2. Bund. Mitte Graz AUT· Mar 12 – Apr 11, 2021 | Mar 12 – Apr 11, 2021 | Classical | 52 | 2208 | 89 |
DSB Squad Challenge 2021 Magdeburg GER· Apr 5 – 11, 2021 | Apr 5 – 11, 2021 | Classical | 10 | 2591 | 45 |
DSB Women Squad Challenge Magdeburg GER· Apr 5 – 11, 2021 | Apr 5 – 11, 2021 | Classical | 8 | 2241 | 28 |
Orsha Open 2021 Orsha BLR· Apr 6 – 11, 2021 | Apr 6 – 11, 2021 | Classical | 37 | 1986 | 79 |
Orsha IM 2021 Orsha BLR· Apr 6 – 11, 2021 | Apr 6 – 11, 2021 | Classical | 10 | 2244 | 43 |
Sergievskiy Mem Rapid Cheboksary RUS· Apr 9 – 11, 2021 | Apr 9 – 11, 2021 | Rapid | 51 | 2175 | 106 |
Konsalt Chess Master Apr Cherkasy UKR· Apr 6 – 11, 2021 | Apr 6 – 11, 2021 | Classical | 12 | 2102 | 45 |
2. Charlotte Masters Charlotte USA· Apr 9 – 11, 2021 | Apr 9 – 11, 2021 | Classical | 12 | 2112 | 35 |
| RB-00401LSS· Apr 6 – 11, 2021 | Apr 6 – 11, 2021 | Classical | 9 | 1892 | 30 |
CRO Ch Junior Teams 2021 Rabac CRO· Apr 6 – 11, 2021 | Apr 6 – 11, 2021 | Classical | 51 | 1828 | 215 |
Kyiv Spring Masters 1 Kiev UKR· Apr 2 – 10, 2021 | Apr 2 – 10, 2021 | Classical | 10 | 2283 | 45 |
ch-TUN 2021 Istanbul TUR· Apr 4 – 10, 2021 | Apr 4 – 10, 2021 | Classical | 10 | 2106 | 44 |
| C'Chartres Apr Blitz OpenEurope-Echecs INT· Apr 10, 2021 | Apr 10, 2021 | Blitz | 229 | 1857 | 1,138 |
| T142-A01LSS· Mar 25 – Apr 9, 2021 | Mar 25 – Apr 9, 2021 | Classical | 7 | 1686 | 23 |
| FICGS__CHESS__NO_ENGINES_TOURNAMENT__000115FICGS· Apr 9, 2021 | Apr 9, 2021 | Classical | 7 | 1677 | 6 |
Rujna Zora-1 ASK IM 2021 Arandjelovac SRB· Apr 3 – 9, 2021 | Apr 3 – 9, 2021 | Classical | 10 | 2229 | 43 |
Rujna Zora-1 GM 2021 Arandjelovac SRB· Apr 3 – 9, 2021 | Apr 3 – 9, 2021 | Classical | 12 | 2388 | 59 |
Rujna Zora-1 IM 2021 Arandjelovac SRB· Apr 3 – 9, 2021 | Apr 3 – 9, 2021 | Classical | 10 | 2259 | 43 |
Belgrade Spring Open 2021 Belgrade SRB· Apr 2 – 9, 2021 | Apr 2 – 9, 2021 | Classical | 52 | 2188 | 89 |
9. BAN Games Classical t Dhaka BAN· Apr 4 – 8, 2021 | Apr 4 – 8, 2021 | Classical | 56 | 1992 | 94 |
| T146-D09LSS· Apr 7, 2021 | Apr 7, 2021 | Classical | 5 | 1804 | 18 |
| QM-00094LSS· Apr 6 – 7, 2021 | Apr 6 – 7, 2021 | Classical | 4 | 2318 | 12 |
80. ch-GEO 1. League Tbilisi GEO· Mar 29 – Apr 6, 2021 | Mar 29 – Apr 6, 2021 | Classical | 39 | 1996 | 101 |
| FICGS__CHESS__RAPID_B__000359FICGS· Apr 5, 2021 | Apr 5, 2021 | Classical | 4 | 1775 | 6 |
1. Easter Bassano Open A Bassano del Grappa ITA· Apr 2 – 5, 2021 | Apr 2 – 5, 2021 | Classical | 42 | 2273 | 91 |
6. Easter Montesilvano Montesilvano ITA· Apr 2 – 5, 2021 | Apr 2 – 5, 2021 | Classical | 28 | 2075 | 36 |
O2C Doeberl Cup 2021 Canberra AUS· Apr 2 – 5, 2021 | Apr 2 – 5, 2021 | Classical | 39 | 2178 | 70 |
| QM-00093LSS· Apr 3 – 4, 2021 | Apr 3 – 4, 2021 | Classical | 4 | 2196 | 12 |
2. Colonial Open 2021 Dulles USA· Apr 2 – 4, 2021 | Apr 2 – 4, 2021 | Classical | 31 | 1976 | 45 |
Galician Championship Padron ESP· Apr 2 – 4, 2021 | Apr 2 – 4, 2021 | Classical | 45 | 1915 | 75 |
5. Semana Santa Alicante Alicante ESP· Mar 31 – Apr 4, 2021 | Mar 31 – Apr 4, 2021 | Classical | 64 | 2200 | 90 |
| Nizami Ganjavi-880 U17Tornelo INT· Apr 2 – 4, 2021 | Apr 2 – 4, 2021 | Classical | 141 | 1810 | 454 |
| OP-05127LSS· Apr 2 – 3, 2021 | Apr 2 – 3, 2021 | Classical | 7 | 1685 | 6 |
| 9. LSS WCH S-00001LSS· Apr 3, 2021 | Apr 3, 2021 | Classical | 7 | 2125 | 36 |
| 9. LSS WCH S-00006LSS· Apr 3, 2021 | Apr 3, 2021 | Classical | 9 | 2171 | 60 |
| 9. LSS WCH S-00004LSS· Apr 3, 2021 | Apr 3, 2021 | Classical | 7 | 2325 | 40 |
11. Blondes vs Brunettes Moscow RUS· Apr 3, 2021 | Apr 3, 2021 | Classical | 16 | 2362 | 64 |
| T145-A45LSS· Apr 3, 2021 | Apr 3, 2021 | Classical | 7 | 2007 | 34 |
| 9. LSS WCH S-00005LSS· Apr 3, 2021 | Apr 3, 2021 | Classical | 6 | 2331 | 30 |