People · Republic of Korea
Sim Jae Yoon
3×3 one-handed · top 2.9% of 73,695 all-time · competing since May 2023 · 2023YOON10
Sim Jae Yoon has been competing for 3 years. His best event is the 3×3 one-handed: a personal-best single of 11.97, set at Korea Open 2026, puts him in the top 2.9% of the 73,695 people who have ever been ranked in the event, and 40th in Republic of Korea. Until January 2010, no official 3×3 one-handed solve in the world had been that fast. Across 7 competitions since May 2023, he has put 132 official solves on the record across four events. Solve to solve, his 3×3 times vary about 11% around a typical one, steadier than 84% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 13.88 in May 2023 to 8.66, a 38% improvement. Sim has entered seven competitions, more competitions than 88% 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 one-handed | 11.97 | 14.81 | top 2.9% | 40 / 966 | |
| 3×3 | 8.66 | 10.14 | top 4.1% | 243 / 4,352 | |
| 2×2 | 2.89 | 3.73 | top 13.0% | 390 / 2,319 | |
| 4×4 | 42.61 | 48.05 | top 15.2% | 290 / 1,308 |
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 2026Four personal bests in one day at Korea Open 2026.
- 25 May 2025Three personal bests in one day at Daejeon Spring 2025.
- 8 Feb 2025First sub-10 3×3: 9.98 at Anyang Haseyo 2025.
- 7 May 2023First competition: Seoul Spring 2023. A 13.88 3×3 single to start from.
Competitions
- Korea Open 2026 · 15 Aug 2026 — 4 personal bests set
- Uhseo Osong 2025 · 15 Nov 2025 — 1 personal best set
- Daejeon Spring 2025 · 25 May 2025 — 3 personal bests set
- Anyang Haseyo 2025 · 8 Feb 2025 — 2 personal bests set
- Korean Championship 2024 · 15 Aug 2024 — 2 personal bests set
- Seoul Open 2024 · 6 Jan 2024 — 1 personal best set
- Seoul Spring 2023 · 7 May 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.
- DongSoo Park (박동수) — met in 27 rounds, never finished ahead
- Jerry Hwang (황동욱) — met in 26 rounds, finished ahead 5 times
- Ko Youngjin (고영진) — met in 25 rounds, finished ahead 11 times
Next targets
- A sub-10 3×3 one-handed single — 779 people have one; it is 1.97 away.
- A sub-8 3×3 single — 7,931 people have one; it is 0.66 away.
Targets move as he improves.