People · Republic of Korea
Yoonsung Jang (장윤성)
2×2 · top 1.8% of 186,767 all-time · competing since October 2022 · 2022JANG11
Yoonsung Jang (장윤성) has been competing for 4 years. His best event is the 2×2: a personal-best single of 1.41, set at Korea Open 2025, puts him in the top 1.8% of the 186,767 people who have ever been ranked in the event, and 46th in Republic of Korea. Until November 2008, no official 2×2 solve in the world had been that fast. Across 15 competitions since October 2022, he has put 312 official solves on the record across ten events. Solve to solve, his 3×3 times vary about 13% around a typical one; 59% of the 35,811 competitors with ten or more counted rounds hold a tighter spread. His 3×3 best has come down from 18.22 in October 2022 to 9.83, a 46% 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 | 1.41 | 3.16 | top 1.8% | 46 / 2,319 | |
| Pyraminx | 2.50 | 3.23 | top 2.2% | 42 / 1,271 | |
| Square-1 | 10.29 | 14.26 | top 6.6% | 26 / 371 | |
| 3×3 | 9.83 | 11.25 | top 7.0% | 410 / 4,352 | |
| 3×3 one-handed | 14.63 | 22.42 | top 7.3% | 100 / 966 | |
| Skewb | 3.68 | 5.15 | top 8.8% | 94 / 854 | |
| Megaminx | 1:18.76 | 1:22.38 | top 21.0% | 140 / 524 | |
| 4×4 | 55.35 | 1:00.18 | top 31.1% | 538 / 1,308 | |
| 5×5 | 1:34.99 | 1:40.64 | top 31.5% | 279 / 716 | |
| Clock | 13.00 | 15.24 | top 39.6% | 263 / 536 |
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
- 23 Nov 2024Three personal bests in one day at Hamchang Winter 2024.
- 9 Mar 2024First sub-10 3×3: 9.83 at Anyang Haseyo 2024.
- 9 Mar 2024Five personal bests in one day at Anyang Haseyo 2024.
- 15 Dec 2023Four personal bests in one day at Korean Championship 2023.
- 15 Apr 2023First sub-15 3×3: 14.65 at Daegu Hot Spring 2023.
- 29 Oct 2022First competition: Cubing SimCheong Open 2022. A 18.22 3×3 single to start from.
Competitions
- Korea Open 2025 · 15 Aug 2025 — 2 personal bests set
- Hamchang Winter 2024 · 23 Nov 2024 — 3 personal bests set
- Daegu Autumn 2024 · 26 Oct 2024 — 2 personal bests set
- Korean Championship 2024 · 15 Aug 2024
- Busan Spring 2024 · 6 Apr 2024
- Anyang Haseyo 2024 · 9 Mar 2024 — 5 personal bests set
- Korean Championship 2023 · 15 Dec 2023 — 4 personal bests set
- Hamchang Open 2023 · 18 Nov 2023 — 2 personal bests set
- Ansan Autumn 2023 · 24 Sep 2023 — 1 personal best set
- Rubik's WCA World Championship 2023 · 12 Aug 2023 — 2 personal bests set
- Seoul Spring 2023 · 7 May 2023 — 1 personal best set
- Daegu Hot Spring 2023 · 15 Apr 2023 — 1 personal best set
- Ansan Spring 2023 · 26 Mar 2023
- KAIST Fall 2022 · 20 Nov 2022 — 1 personal best set
- Cubing SimCheong Open 2022 · 29 Oct 2022
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 62 rounds, finished ahead 4 times
- MinGwan Yeo (여민관) — met in 53 rounds, finished ahead 28 times
- Minseo Gu (구민서) — met in 53 rounds, finished ahead 17 times
Next targets
- A sub-1 2×2 single — 1,032 people have one; it is 0.41 away.
- A sub-2 Pyraminx single — 1,476 people have one; it is 0.50 away.
Targets move as he improves.