People · Republic of Korea
YoonSung Choi (최윤성)
2×2 · top 0.29% of 186,767 all-time · competing since October 2024 · 2024CHOI36
YoonSung Choi (최윤성) has been competing for a year. His best event is the 2×2: a personal-best single of 0.85, set at Seoul Summer 2026, puts him in the top 0.29% of the 186,767 people who have ever been ranked in the event, and 4th in Republic of Korea. Until November 2011, no official 2×2 solve in the world had been that fast. Across 15 competitions since October 2024, he has put 450 official solves on the record across twelve events. Solve to solve, his 3×3 times vary about 16% around a typical one; 90% of the 35,811 competitors with ten or more counted rounds hold a tighter spread. His 3×3 best has come down from 8.91 in November 2024 to 6.10, a 32% improvement. YoonSung has entered 15 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 | Republic of Korea | |
|---|---|---|---|---|---|
| 2×2 | 0.85 | 2.01 | top 0.29% | 4 / 2,319 | |
| 3×3 | 6.10 | 7.91 | top 0.55% | 40 / 4,352 | |
| 3×3 one-handed | 9.88 | 13.87 | top 0.98% | 15 / 966 | |
| 4×4 | 31.82 | 41.10 | top 4.0% | 83 / 1,308 | |
| Clock | 7.48 | 8.53 | top 12.9% | 88 / 536 | |
| Square-1 | 13.85 | 21.15 | top 13.8% | 54 / 371 | |
| Pyraminx | 5.19 | 7.78 | top 14.4% | 224 / 1,271 | |
| 5×5 | 1:18.22 | 1:22.26 | top 17.7% | 180 / 716 | |
| Skewb | 5.14 | 7.00 | top 19.3% | 197 / 854 | |
| 3×3 Fewest Moves | 33 moves | 37.67 | top 23.4% | 48 / 173 | |
| Megaminx | 1:30.00 | 1:41.48 | top 28.2% | 183 / 524 | |
| 6×6 | 2:57.67 | 3:06.82 | top 39.9% | 168 / 329 |
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
- 19 Jul 2026Three personal bests in one day at Seoul Summer 2026.
- 17 Jan 2026Three personal bests in one day at Seoul Winter 2026.
- 27 Dec 2025Three personal bests in one day at Korean Championship 2025.
- 15 Aug 2025Seven personal bests in one day at Korea Open 2025.
- 13 Jul 2025Four personal bests in one day at Suwon Summer 2025.
- 25 May 2025Three personal bests in one day at Daejeon Spring 2025.
Competitions
- Korea Open 2026 · 15 Aug 2026 — 1 personal best set
- Seoul Summer 2026 · 19 Jul 2026 — 3 personal bests set
- Seoul Spring 2026 · 22 Mar 2026 — 1 personal best set
- Seoul Winter 2026 · 17 Jan 2026 — 3 personal bests set
- Korean Championship 2025 · 27 Dec 2025 — 3 personal bests set
- Uhseo Osong 2025 · 15 Nov 2025
- We Laugh Pohanghang 2025 · 14 Sep 2025 — 1 personal best set
- Korea Open 2025 · 15 Aug 2025 — 7 personal bests set
- Suwon Summer 2025 · 13 Jul 2025 — 4 personal bests set
- Daejeon Spring 2025 · 25 May 2025 — 3 personal bests set
- FMC Busan 2025 · 2 Mar 2025 — 1 personal best set
- Happy Suseong 2025 · 18 Jan 2025 — 4 personal bests set
- Seoul Winter 2024 · 14 Dec 2024
- Hamchang Winter 2024 · 23 Nov 2024 — 1 personal best set
- Daegu Autumn 2024 · 26 Oct 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.
- Seung Hyuk Nahm (남승혁) — met in 81 rounds, finished ahead once
- Ko Youngjin (고영진) — met in 80 rounds, finished ahead 42 times
- Kyeongmin Choi (최경민) — met in 80 rounds, finished ahead twice
Next targets
- A sub-6 3×3 single — 1,376 people have one; it is 0.10 away.
- A sub-8 3×3 one-handed single — 151 people have one; it is 1.88 away.
Targets move as he improves.