People · Republic of Korea
HeeHwan Chai (채희환)
2×2 · top 3.4% of 189,179 all-time · competing since December 2023 · 2023CHAI15
HeeHwan Chai (채희환) has been competing for 3 years. His best event is the 2×2: a personal-best single of 1.75, set at Korea Open 2025, puts him in the top 3.4% of the 189,179 people who have ever been ranked in the event, and 94th in Republic of Korea. Until February 2008, no official 2×2 solve in the world had been that fast. Across 9 competitions since December 2023, he has put 206 official solves on the record across seven events. Solve to solve, his 3×3 times vary about 16% around a typical one; 91% of the 36,406 competitors with ten or more counted rounds hold a tighter spread. His 3×3 best has come down from 17.93 in December 2023 to 8.59, a 52% improvement. HeeHwan has entered nine competitions, more competitions than 91% 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 | 1.75 | 4.03 | top 3.4% | 94 / 2,334 | |
| 3×3 | 8.59 | 11.60 | top 4.0% | 238 / 4,390 | |
| Pyraminx | 3.98 | 6.14 | top 7.6% | 124 / 1,294 | |
| Clock | 6.56 | 8.48 | top 9.3% | 62 / 541 | |
| Skewb | 4.46 | 7.53 | top 14.2% | 153 / 874 | |
| 5×5 | 1:39.10 | 1:44.84 | top 34.7% | 307 / 725 | |
| 4×4 | 59.22 | 1:01.02 | top 35.7% | 622 / 1,316 |
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
- 25 May 2025First sub-10 3×3: 8.93 at Daejeon Spring 2025.
- 15 Aug 2024First sub-15 3×3: 12.40 at Korean Championship 2024.
- 15 Aug 2024Four personal bests in one day at Korean Championship 2024.
- 15 Dec 2023First competition: Korean Championship 2023. A 17.93 3×3 single to start from.
Competitions
- Korea Open 2026 · 15 Aug 2026 — 1 personal best set
- Korea Open 2025 · 15 Aug 2025 — 2 personal bests set
- Osan Summer 2025 · 29 Jun 2025 — 2 personal bests set
- Daejeon Spring 2025 · 25 May 2025 — 1 personal best set
- Seoul Winter 2024 · 14 Dec 2024
- Brown Fall Seongnam 2024 · 21 Sep 2024 — 1 personal best set
- Korean Championship 2024 · 15 Aug 2024 — 4 personal bests set
- Daegu Cold Winter 2024 · 3 Feb 2024 — 2 personal bests 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 40 rounds, finished ahead 23 times
- Ko Youngjin (고영진) — met in 40 rounds, finished ahead 16 times
- On Yu (온유) — met in 39 rounds, finished ahead twice
Next targets
- A sub-1 2×2 single — 1,050 people have one; it is 0.75 away.
- A sub-8 3×3 single — 8,101 people have one; it is 0.59 away.
Targets move as he improves.