In the past year (2025), Fumiki Koseki (古関章記) competed in 9 competitions and 27 rounds across 13 events, from Feb 16th to Dec 7th.
Solves/Attempts
He attempted 129 solves and completed 128.
| Event | Solves | Attempts |
| 3x3x3 Cube | 40 | 40 |
| Pyraminx | 25 | 25 |
| 2x2x2 Cube | 10 | 10 |
| 4x4x4 Cube | 10 | 10 |
| 3x3x3 One-Handed | 10 | 10 |
| 5x5x5 Cube | 5 | 5 |
| Megaminx | 5 | 5 |
| Skewb | 5 | 5 |
| Square-1 | 5 | 5 |
| Clock | 4 | 5 |
| 6x6x6 Cube | 3 | 3 |
| 7x7x7 Cube | 3 | 3 |
| 3x3x3 Fewest Moves | 3 | 3 |
Personal Bests
He broke his personal best 6 times across 5 events, including 3 singles and 3 averages.
| Event | Times | Single | Average |
| 6x6x6 Cube | 2 | 1 | 1 |
| 7x7x7 Cube | 1 | 1 | 0 |
| 3x3x3 Fewest Moves | 1 | 0 | 1 |
| 3x3x3 One-Handed | 1 | 1 | 0 |
| Pyraminx | 1 | 0 | 1 |
Improvements of Single
| Event | ≤2024 | 2025 | Improvement |
| 6x6x6 Cube | 2:53.34 | 2:34.69 | 18.65 (12.06%) |
| 3x3x3 One-Handed | 23.26 | 22.29 | 0.97 (4.35%) |
| 7x7x7 Cube | 4:08.41 | 4:08.02 | 0.39 (0.16%) |
Improvements of Average
| Event | ≤2024 | 2025 | Improvement |
| 3x3x3 Fewest Moves | 45.33 | 43.33 | 2 (4.62%) |
| Pyraminx | 7.30 | 7.28 | 0.02 (0.27%) |
| 6x6x6 Cube | 3:00.35 | 3:00.34 | 0.01 (0.01%) |
Cubers
He met 384 cubers from 24 countries/regions, 166 of whom competed with him more than once. Hajime Miyazaki (宮崎朔) was the only one who accompanied the whole 9 competitions.
| Shared Competitions | Competitors |
| 1 | 218 |
| 2 | 68 |
| 3 | 44 |
| 4 | 19 |
| 5 | 12 |
| 6 | 13 |
| 7 | 6 |
| 8 | 3 |
| 9 | 1 |
| All | 384 |
Regions
He competed in 1 country/region.
