People · Indonesia
Sean Riley Kosasih
3×3 · top 4.9% of 284,439 all-time · competing since November 2025 · 2025KOSA02
Sean Riley Kosasih has been competing for 10 months. His best event is the 3×3: a personal-best single of 9.04, set at Kalibata Agustusan 2026, puts him in the top 4.9% of the 284,439 people who have ever been ranked in the event, and 187th in Indonesia. Until May 2008, no official 3×3 solve in the world had been that fast. Across 6 competitions since November 2025, he has put 125 official solves on the record across two events. Solve to solve, his 3×3 times vary about 15% around a typical one; 86% of the 35,811 competitors with ten or more counted rounds hold a tighter spread. Sean has entered six competitions, more competitions than 86% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Indonesia | |
|---|---|---|---|---|---|
| 3×3 | 9.04 | 10.83 | top 4.9% | 187 / 4,145 | |
| 2×2 | 2.26 | 2.98 | top 6.7% | 136 / 2,889 |
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, 2×2. Faster is higher — the axis is the right way up.
The story so far
- 7 Feb 2026First sub-10 3×3: 9.82 at PISKG Premiere Cubing 2026.
- 15 Nov 2025First competition: Balam Cubes Baywalk Sides 2025. A 10.43 3×3 single to start from.
Competitions
- Kalibata Agustusan 2026 · 15 Aug 2026 — 2 personal bests set
- Cupika Jakarta Summer 2026 · 11 Jul 2026
- Balam Cubes Jakarta Cube Feast 2026 · 2 May 2026 — 1 personal best set
- PISKG Premiere Cubing 2026 · 7 Feb 2026 — 1 personal best set
- Balam Cubes Jakarta New Year 2026 · 10 Jan 2026 — 1 personal best set
- Balam Cubes Baywalk Sides 2025 · 15 Nov 2025 — 2 personal bests set
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.
- Leon Marcell Alamanda — met in 25 rounds, never finished ahead
- William Arthur Wiranda — met in 25 rounds, never finished ahead
- Tiffany Li — met in 24 rounds, finished ahead 12 times
Next targets
- A sub-8 3×3 single — 7,931 people have one; it is 1.04 away.
- A sub-2 2×2 single — 8,848 people have one; it is 0.26 away.
Targets move as he improves.