People · Japan
Sota Kurosaki (黒﨑創太)
Square-1 · top 7.1% of 25,272 all-time · competing since November 2019 · 2019KURO05
Sota Kurosaki (黒﨑創太) has been competing for 7 years. His best event is the Square-1: a personal-best single of 10.53, set at UCSD Extravaganza 2023, puts him in the top 7.1% of the 25,272 people who have ever been ranked in the event, and 23rd in Japan. Until August 2010, no official Square-1 solve in the world had been that fast. Across 14 competitions since November 2019, he has put 186 official solves on the record across five events. Solve to solve, his 3×3 times vary about 15% around a typical one; 88% of the 35,811 competitors with ten or more counted rounds hold a tighter spread. His 3×3 best has come down from 16.47 in November 2019 to 11.10, a 33% improvement. Sota has entered 14 competitions, more competitions than 95% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Japan | |
|---|---|---|---|---|---|
| Square-1 | 10.53 | 13.79 | top 7.1% | 23 / 245 | |
| 3×3 | 11.10 | 13.35 | top 10.8% | 468 / 3,329 | |
| Skewb | 4.04 | 4.70 | top 11.2% | 57 / 338 | |
| 3×3 one-handed | 23.26 | 30.68 | top 29.5% | 238 / 529 | |
| Clock | 12.10 | — | early days — 3 solves | 129 / 263 |
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
- 1 Mar 2026Three personal bests in one day at Berkeley Favorites 2026.
- 7 Oct 2023First sub-15 3×3: 12.32 at UCSD Extravaganza 2023.
- 2 Nov 2019First competition: Japan Championship 2019. A 16.47 3×3 single to start from.
Competitions
- Berkeley Pre-Cal Day 2026 · 17 Apr 2026
- Berkeley March Weekday 2026 · 13 Mar 2026 — 1 personal best set
- Berkeley Favorites 2026 · 1 Mar 2026 — 3 personal bests set
- Berkeley February Weekday 2026 · 6 Feb 2026
- Berkeley January Weekday 2026 · 22 Jan 2026
- Berkeley November Weekday 2025 · 14 Nov 2025
- Cool Down Berkeley 2025 · 2 Nov 2025
- Berkeley October Weekday 2025 · 24 Oct 2025
- Berkeley September Weekday 2025 · 19 Sep 2025
- UCSD May A 2025 · 11 May 2025
- SoCal Speedcubing at Super STEM Saturday 2025 · 8 Mar 2025 — 1 personal best set
- San Diego Newcomers 2024 · 16 Mar 2024
- UCSD Extravaganza 2023 · 7 Oct 2023 — 1 personal best set
- Japan Championship 2019 · 2 Nov 2019
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.
- Joseph Ong — met in 20 rounds, never finished ahead
- James Chea — met in 17 rounds, finished ahead once
- Diego Jiashu Jiang (蒋佳澍) — met in 15 rounds, finished ahead twice
Next targets
- A sub-10 Square-1 single — 1,533 people have one; it is 0.53 away.
- A sub-10 3×3 single — 21,172 people have one; it is 1.10 away.
Targets move as he improves.