People · Japan
Kosei Kamatsu (加松幸晟)
3×3 · top 13.0% of 284,439 all-time · competing since March 2024 · 2024KAMA01
Kosei Kamatsu (加松幸晟) has been competing for 2 years. His best event is the 3×3: a personal-best single of 11.74, set at Cubing at The Cube 2025, puts him in the top 13.0% of the 284,439 people who have ever been ranked in the event, and 552nd in Japan. Across 2 competitions since March 2024, he has put 16 official solves on the record across three events. His 3×3 best has come down from 17.55 in March 2024 to 11.74, a 33% improvement. Kosei has entered two competitions.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Japan | |
|---|---|---|---|---|---|
| 3×3 | 11.74 | 17.43 | top 13.0% | 552 / 3,329 | |
| 2×2 | 5.89 | 7.86 | top 49.7% | 614 / 1,021 | |
| 4×4 | 1:35.71 | — | early days — 2 solves | 559 / 667 |
Percentile against all competitors ever ranked in each event, a fairer measure than raw rank, because the pools differ by a factor of ten.
The line so far
Best single per competition, 3×3. Faster is higher — the axis is the right way up.
The story so far
- 11 Jan 2025First sub-15 3×3: 11.74 at Cubing at The Cube 2025.
- 31 Mar 2024First competition: Tokai Challenge Alpha 2024. A 17.55 3×3 single to start from.
Competitions
- Cubing at The Cube 2025 · 11 Jan 2025 — 1 personal best set
- Tokai Challenge Alpha 2024 · 31 Mar 2024
Reading this page: a single is one solve's time · an average is the middle three of five solves, best and worst discarded · a PB is a personal best · a DNF (did not finish) is an attempt with no valid result: a popped piece, an unsolved face, an over-limit memorisation · top X% compares against everyone ever ranked in that event, which is fairer than raw rank because event pools differ tenfold.
The circuit
The people whose scorecards keep turning up next to his.
- Paul N. van de Geest — met in 3 rounds, finished ahead 3 times
- Scott Contini — met in 3 rounds, finished ahead 3 times
- Anita Trairattanasirikul — met in 3 rounds, finished ahead 3 times
Next targets
- A sub-10 3×3 single — 21,172 people have one; it is 1.74 away.
- A sub-5 2×2 single — 73,413 people have one; it is 0.89 away.
Targets move as he improves.