People · Japan
Kozo Hasegawa
2×2 · top 9.2% of 186,767 all-time · competing since June 2023 · 2023HASE02
Kozo Hasegawa has been competing for 3 years. His best event is the 2×2: a personal-best single of 2.53, set at Tokyo Spring PM 2025, puts him in the top 9.2% of the 186,767 people who have ever been ranked in the event, and 127th in Japan. Until February 2008, no official 2×2 solve in the world had been that fast. Across 5 competitions since June 2023, he has put 42 official solves on the record across three events. Solve to solve, his 3×3 times vary about 23% around a typical one, an early reading from 5 counted rounds. His 3×3 best has come down from 12.22 in June 2023 to 10.90, an 11% improvement. Kozo has entered five competitions, more competitions than 83% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Japan | |
|---|---|---|---|---|---|
| 2×2 | 2.53 | 4.15 | top 9.2% | 127 / 1,021 | |
| 3×3 | 10.90 | 13.39 | top 10.2% | 436 / 3,329 | |
| 4×4 | 56.06 | 59.69 | top 32.0% | 0 / 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
- 4 Jun 2023First competition: Singapore AMK CC Cubing B 2023. A 12.22 3×3 single to start from.
Competitions
- Kanto Spring 2025 · 31 May 2025
- Tokyo Spring PM 2025 · 20 Apr 2025 — 1 personal best set
- Shonan PM 2024 · 7 Dec 2024 — 1 personal best set
- Singapore Mini 2023 · 9 Sep 2023 — 1 personal best set
- Singapore AMK CC Cubing B 2023 · 4 Jun 2023
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.
- Naoto Urata (浦田直斗) — met in 5 rounds, finished ahead once
- Hitoki Kidahashi (木田橋仁毅) — met in 5 rounds, never finished ahead
- Ao Nogami (野上碧) — met in 5 rounds, never finished ahead
Next targets
- A sub-2 2×2 single — 8,848 people have one; it is 0.53 away.
- A sub-10 3×3 single — 21,172 people have one; it is 0.90 away.
Targets move as he improves.