People · Republic of Korea
Ujin Choi
3×3 · top 1.3% of 284,439 all-time · competing since November 2023 · 2023CHOI35
Ujin Choi has been competing for 3 years. His best event is the 3×3: a personal-best single of 6.98, set at Korea Open 2025, puts him in the top 1.3% of the 284,439 people who have ever been ranked in the event, and 81st in Republic of Korea. Until November 2010, no official 3×3 solve in the world had been that fast. Across 8 competitions since November 2023, he has put 253 official solves on the record across nine events. Solve to solve, his 3×3 times vary about 14% around a typical one; 66% of the 35,811 competitors with ten or more counted rounds hold a tighter spread. That figure sets aside his 4 DNFs. His 3×3 best has come down from 10.34 in November 2023 to 6.98, a 32% improvement. Ujin has entered eight competitions, more competitions than 90% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Republic of Korea | |
|---|---|---|---|---|---|
| 3×3 | 6.98 | 9.75 | top 1.3% | 81 / 4,352 | |
| 4×4 | 33.39 | 44.69 | top 5.3% | 110 / 1,308 | |
| 5×5 | 1:04.01 | 1:12.67 | top 7.8% | 80 / 716 | |
| 2×2 | 2.56 | 3.31 | top 9.5% | 280 / 2,319 | |
| 3×3 one-handed | 20.14 | 31.48 | top 20.8% | 292 / 966 | |
| Pyraminx | 6.66 | 8.54 | top 25.1% | 385 / 1,271 | |
| 6×6 | 3:06.71 | 3:15.13 | top 44.1% | 178 / 329 | |
| Skewb | 8.87 | 16.60 | top 47.6% | 463 / 854 | |
| Megaminx | 2:05.34 | 2:35.87 | top 48.8% | 308 / 524 |
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 Aug 2025Five personal bests in one day at Korea Open 2025.
- 15 Aug 2024Four personal bests in one day at Korean Championship 2024.
- 6 Apr 2024First sub-10 3×3: 9.52 at Busan Spring 2024.
- 6 Apr 2024Three personal bests in one day at Busan Spring 2024.
- 15 Dec 2023Three personal bests in one day at Korean Championship 2023.
- 18 Nov 2023First competition: Hamchang Open 2023. A 10.34 3×3 single to start from.
Competitions
- Korea Open 2025 · 15 Aug 2025 — 5 personal bests set
- Seoul Winter 2024 · 14 Dec 2024 — 1 personal best set
- Korean Championship 2024 · 15 Aug 2024 — 4 personal bests set
- Ansan Summer 2024 · 20 Jul 2024 — 1 personal best set
- Prime Cubing Day Seoul 2024 · 15 Jun 2024 — 2 personal bests set
- Busan Spring 2024 · 6 Apr 2024 — 3 personal bests set
- Korean Championship 2023 · 15 Dec 2023 — 3 personal bests set
- Hamchang Open 2023 · 18 Nov 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.
- Minseo Gu (구민서) — met in 55 rounds, finished ahead twice
- DongSoo Park (박동수) — met in 55 rounds, never finished ahead
- MinGwan Yeo (여민관) — met in 54 rounds, finished ahead 15 times
Next targets
- A sub-6 3×3 single — 1,376 people have one; it is 0.98 away.
- A sub-30 4×4 single — 2,388 people have one; it is 3.39 away.
Targets move as he improves.