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Illinois Open State Championship
| Full information | website |
| When | September 3-7, 2026 |
| City | Lisle |
| State | Illinois |
| Prize fund | $15,000 |
| Rating system | USCF, FIDE |
| Advanced entries | advanced |
| Registration | register |
| FIDE titles norms possibility | No |
| Organizer | Wilson Chess |
| Results | results |
