| Kazakhstan Blitz Team Championship 2026 | 2026-10-04 2026-10-04 | Karaganda · KAZ | Blitz | 48 |
| 3rd SCC Standard Tournament | 2026-10-04 2026-10-05 | Goyang · KOR | Classical | 38 |
| UKRAINIAN CHESS STARS CUP (women - rapid, 3 stage) | 2026-10-04 2026-10-04 | Chernivtsi · UKR | Rapid | 37 |
| UKRAINIAN CHESS STARS CUP (open - rapid, 3 stage) | 2026-10-04 2026-10-04 | Chernivtsi · UKR | Rapid | 78 |
| Mistrzostwa Miasta Przemysla 2026 - BLITZ - Grupa C | 2026-10-04 2026-10-04 | Przemysl · POL | Blitz | 15 |
| Mistrzostwa Miasta Przemysla 2026 - BLITZ - Grupa B | 2026-10-04 2026-10-04 | Przemysl · POL | Blitz | 14 |
| Mistrzostwa Miasta Przemysla 2026 - BLITZ - Grupa OPEN | 2026-10-04 2026-10-04 | Przemysl · POL | Blitz | 41 |
| 17th Valter Heuer Memorial | 2026-10-04 2026-10-04 | Elva · EST | Blitz | 57 |
| Rapide Cote bleue - Martigues 4 Octobre 2026 Tournoi Jeunes -1500 Elo jusqu'a Benjamin | 2026-10-04 2026-10-04 | MARTIGUES · FRA | Rapid | 32 |
| Rapide Cote bleue - Martigues 4 Octobre 2026 Tournoi B -1700 Elo | 2026-10-04 2026-10-04 | MARTIGUES · FRA | Rapid | 89 |
| Rapide Cote bleue - Martigues 4 Octobre 2026 | 2026-10-04 2026-10-04 | MARTIGUES · FRA | Rapid | 53 |
| Pest County Team Ch. 2026-27 Herczeg Oszkar Memorial Group 1st A R 1-2 | 2026-10-04 2026-10-18 | Pest County Region · HUN | Classical | 146 |
| IV Torneio IRT Horst Graetz | 2026-10-04 2026-10-04 | Sao Paulo SP · BRA | Rapid | 27 |
| 48th Greek National Womens Championship 2026 | 2026-10-04 2026-10-12 | Porto Cheli · GRE | Classical | 10 |
| 1er IRT Challenger Sub-1800 - I EDICION | 2026-10-04 2026-10-04 | Santiago · CHI | Classical | 36 |
| Campeonato de Ajedrez Rapido por Equipos 2026-2027 Rondas 5-10 | 2026-10-04 2026-10-25 | Madrid · ESP | Rapid | 1428 |
| HUN Team Ch. Toth Laszlo Memorial Group 2026-27 R 1-2 | 2026-10-04 2026-10-18 | Hungary South East · HUN | Classical | 165 |
| HUN Team Ch. Szechenyi Memorial Group 2026-27 R 1-2 | 2026-10-04 2026-10-18 | Hungary North West · HUN | Classical | 188 |
| HUN Team Ch. Breyer Gyula Memorial Group 2026-27 R 1-2 | 2026-10-04 2026-10-18 | Hungary Middle · HUN | Classical | 172 |
| HUN Team Ch. Erkel Ferenc Memorial Group 2026-27 R 1-2 | 2026-10-04 2026-10-18 | Hungary Middle · HUN | Classical | 147 |
| HUN Team Ch. Barcza Gedeon Memorial Group 2026-27 R 1-2 | 2026-10-04 2026-10-18 | Hungary North East · HUN | Classical | 163 |
| HUN Team Ch. Asztalos Lajos Memorial Group 2026-27 R 1-2 | 2026-10-04 2026-10-18 | Hungary South West · HUN | Classical | 135 |
| HUN Team 1st Div. Maroczy Geza Memorial Group 2026-27 R 1-2 | 2026-10-04 2026-10-18 | Hungary East · HUN | Classical | 181 |
| HUN Team 1st Div. Charousek R Memorial Group 2026-27 R 1-2 | 2026-10-04 2026-10-18 | Hungary West · HUN | Classical | 173 |
| IRT 13vo Circuito de Ajedrez de Boyaca Sub 14 Absoluto | 2026-10-04 2026-10-04 | Sogamoso - BOY · COL | Rapid | 13 |
| IRT 13vo Circuito de Ajedrez de Boyaca Mayores Absoluto | 2026-10-04 2026-10-04 | Sogamoso - BOY · COL | Rapid | 35 |
| 2026 UK Open Blitz: Leeds Qualifier | 2026-10-04 2026-10-04 | Leeds · ENG | Blitz | 38 |
| Offene Saarlaendische Einzelmeisterschaften 2026 C-Turnier | 2026-10-04 2026-10-10 | Riegelsberg · GER | Classical | 28 |
| Offene Saarlaendische Einzelmeisterschaften 2026 B-Turnier | 2026-10-04 2026-10-10 | Riegelsberg · GER | Classical | 28 |
| Offene Saarlaendische Einzelmeisterschaften 2026 A-Turnier | 2026-10-04 2026-10-10 | Riegelsberg · GER | Classical | 45 |
| Offene Saarlaendische Einzelmeisterschaften 2026 Meisterturnier | 2026-10-04 2026-10-10 | Riegelsberg · GER | Classical | 33 |
| Blitzmannschaftsmeisterschaft Hannover 2026 | 2026-10-04 2026-10-04 | Hannover · GER | Blitz | 14 |
| 19eme Tournoi rapide d'Orcher La Tour | 2026-10-04 2026-10-04 | GONFREVILLE L'ORCHER · FRA | Rapid | 126 |
| National Day Chess Festival 2026 - Blitz | 2026-10-04 2026-10-04 | Causeway Bay · HKG | Blitz | 46 |
| 2e Rapide de Flers | 2026-10-04 2026-10-04 | FLERS · FRA | Rapid | 30 |
| 1er Tournoi Rapide Octobre Rose - Montauban - 2026 | 2026-10-04 2026-10-04 | MONTAUBAN · FRA | Rapid | 50 |
| 2e Memorial Alberto Zurano FIDE Meaux | 2026-10-04 2026-10-04 | MEAUX · FRA | Rapid | 26 |
| Trofeo Valparaiso 2026 | 2026-10-04 2026-10-04 | Palma de Mallorca · ESP | Blitz | 45 |
| RAPID 19 CITTA' DI LIVORNO - 6 MEMORIAL CARLO FALCIANI - B | 2026-10-04 2026-10-04 | LIVORNO · ITA | Rapid | 32 |
| RAPID 19 CITTA' DI LIVORNO - 6 MEMORIAL CARLO FALCIANI - A | 2026-10-04 2026-10-04 | LIVORNO · ITA | Rapid | 45 |
| 4th TCIS Chess Championship 2026 | 2026-10-04 2026-10-04 | Bangkok · THA | Rapid | 11 |
| National Youth Blitz Chess Championship 2026 - Under 10 Girls | 2026-10-04 2026-10-04 | Colombo · SRI | Blitz | 83 |
| National Youth Blitz Chess Championship 2026 - Under 10 Open | 2026-10-04 2026-10-04 | Colombo · SRI | Blitz | 143 |
| CCC Sunday Afternoon Classical 38 - U1300 | 2026-10-04 2026-10-25 | Charlotte, NC · USA | Rapid | 28 |
| CCC Sunday Afternoon Classical 38 - U1600 | 2026-10-04 2026-10-25 | Charlotte, NC · USA | Classical | 21 |
| CCC Sunday Afternoon Classical 38 - Top | 2026-10-04 2026-10-25 | Charlotte, NC · USA | Classical | 25 |
| 4e Rapide du bocage | 2026-10-04 2026-10-04 | CHAMBRETAUD · FRA | Rapid | 55 |
| 8eme open rapide Geneston - Le Bignon | 2026-10-04 2026-10-04 | LE BIGNON · FRA | Rapid | 97 |
| 1st Saakar Foundation All India Open Fide Rapid Rating Chess Tournament 2026 | 2026-10-04 2026-10-04 | Pune · IND | Rapid | 265 |
| Rapide de Redene 2026 - Tous en rose - Tournoi jeunes | 2026-10-04 2026-10-04 | REDENE · FRA | Rapid | 19 |