People · Japan
Koshi Sakamoto (坂本航士)
3×3 · top 3.2% of 284,439 all-time · competing since September 2024 · 2024SAKA04
Koshi Sakamoto (坂本航士) has been competing for 2 years. His best event is the 3×3: a personal-best single of 8.22, set at Katano Summer 2025, puts him in the top 3.2% of the 284,439 people who have ever been ranked in the event, and 133rd in Japan. Until July 2008, no official 3×3 solve in the world had been that fast. Across 2 competitions since September 2024, he has put 20 official solves on the record across two events. His 3×3 best has come down from 9.84 in September 2024 to 8.22, a 16% improvement. Koshi has entered two competitions.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Japan | |
|---|---|---|---|---|---|
| 3×3 | 8.22 | 10.68 | top 3.2% | 133 / 3,329 | |
| 2×2 | 4.27 | 5.46 | top 30.0% | 378 / 1,021 |
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
- 15 Sep 2024First competition: Tokai Open PM 2024. A 9.84 3×3 single to start from.
Competitions
- Katano Summer 2025 · 15 Sep 2025 — 2 personal bests set
- Tokai Open PM 2024 · 15 Sep 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.
- Yuichi Hamada (濵田祐一) — met in 4 rounds, finished ahead 4 times
- Akatsuki Kitamura (北村曉) — met in 4 rounds, finished ahead 4 times
- Tomoki Moriyama (森山智樹) — met in 4 rounds, finished ahead 4 times
Next targets
- A sub-8 3×3 single — 7,931 people have one; it is 0.22 away.
- A sub-4 2×2 single — 49,452 people have one; it is 0.27 away.
Targets move as he improves.