International
Chess Federation
| Event code | 430683 |
| Tournament Name | Japan Open 2025(Challenger Category) |
| City | Tokyo |
| Country | JPN |
| Number of players | 150 |
| System | s |
| Hybrid | NO |
| Category | 0 |
| Start Date | 2025-09-19 |
| End Date | 2025-09-23 |
| Date received | 0000-00-00 |
| Date registered | 2025-07-04 |
| Type | |
| Time Control | Standard: 90 minutes with 30 second increment from move 1 |
| Zone | |
| Reported mult. round days | 4 |
| Chief Arbiter | Bunawan, Bong (INA) (FT) |
| Deputy Chief Arbiter | Abe, Yuta (JPN) Okabe, Yuki (JPN) |
| Arbiter | Hiratsuka, Yoshihiro (JPN) |
| Chief Organizer | Manabe, Hiroshi (JPN) |
| Organizer | |
More information: The full list of tournaments received from Japan for October 2025