People · Republic of Korea
Hajin Cho (조하진)
3×3 · top 51.6% of 284,439 all-time · competing since December 2023 · 2023CHOH06
Hajin Cho (조하진) has been competing for 3 years. His best event is the 3×3: a personal-best single of 24.54, set at Korea Open 2025, puts him in the top 51.6% of the 284,439 people who have ever been ranked in the event, and 2,611th in Republic of Korea. Across 7 competitions since December 2023, he has put 74 official solves on the record across six events. Solve to solve, his 3×3 times vary about 16% around a typical one, an early reading from 6 counted rounds. His 3×3 best has come down from 34.87 in December 2023 to 24.54, a 30% improvement. Hajin 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 | 24.54 | 28.66 | top 51.6% | 2,611 / 4,352 | |
| Pyraminx | 11.05 | 13.37 | top 60.9% | 859 / 1,271 | |
| Skewb | 13.01 | 25.43 | top 70.7% | 645 / 854 | |
| 2×2 | 9.23 | 10.04 | top 74.6% | 1,895 / 2,319 | |
| Clock | 24.65 | — | top 76.1% | 458 / 536 | |
| Megaminx | 3:22.63 | — | early days — 2 solves | 445 / 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 2025Four personal bests in one day at Korea Open 2025.
- 9 Mar 2024First sub-30 3×3: 25.04 at Anyang Haseyo 2024.
- 15 Dec 2023First competition: Korean Championship 2023. A 34.87 3×3 single to start from.
Competitions
- Korea Open 2025 · 15 Aug 2025 — 4 personal bests set
- Osan Summer 2025 · 29 Jun 2025
- Please Minx Korea 2025 · 5 Apr 2025 — 2 personal bests set
- Korean Championship 2024 · 15 Aug 2024
- Ansan Summer 2024 · 20 Jul 2024
- Anyang Haseyo 2024 · 9 Mar 2024 — 1 personal best set
- Korean Championship 2023 · 15 Dec 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.
- Choi Goho (최고호) — met in 20 rounds, never finished ahead
- Ko Youngjin (고영진) — met in 20 rounds, never finished ahead
- Minseo Gu (구민서) — met in 20 rounds, never finished ahead
Next targets
- A sub-20 3×3 single — 113,584 people have one; it is 4.54 away.
- A sub-10 Pyraminx single — 68,530 people have one; it is 1.05 away.
Targets move as he improves.