People · Republic of Korea
Koo HaiMin (구해민)
Skewb · top 22.2% of 73,281 all-time · competing since November 2023 · 2023HAIM02
Koo HaiMin (구해민) has been competing for 3 years. His best event is the Skewb: a personal-best single of 5.53, set at Ansan Favorites 2026, puts him in the top 22.2% of the 73,281 people who have ever been ranked in the event, and 227th in Republic of Korea. Across 6 competitions since November 2023, he has put 45 official solves on the record across eight events. His 3×3 best has come down from 27.56 in January 2024 to 20.45, a 26% improvement. Koo has entered six competitions, more competitions than 86% 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 | |
|---|---|---|---|---|---|
| Skewb | 5.53 | 11.13 | top 22.2% | 227 / 854 | |
| 3×3 | 20.45 | 23.84 | top 41.2% | 2,132 / 4,352 | |
| Clock | 13.88 | 15.33 | top 43.3% | 295 / 536 | |
| 5×5 | 2:10.77 | 2:32.53 | top 55.9% | 453 / 716 | |
| Pyraminx | 12.93 | 14.99 | top 72.5% | 986 / 1,271 | |
| 4×4 | 1:57.84 | 2:10.40 | top 80.7% | 1,146 / 1,308 | |
| 3×3 Fewest Moves | 57 moves | 59.00 | top 91.3% | 161 / 173 | |
| 6×6 | 7:27.50 | 7:46.67 | early days — 3 solves | 325 / 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
- 18 Nov 2023First competition: Hamchang Open 2023.
Competitions
- Silent Korea Open 2026 · 1 Aug 2026 — 1 personal best set
- Ansan Favorites 2026 · 7 Feb 2026
- Korea Newcomers AM 2025 · 8 Mar 2025 — 1 personal best set
- Korean FMC Championship 2024 · 24 Aug 2024
- Seoul Open 2024 · 6 Jan 2024
- Hamchang Open 2023 · 18 Nov 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.
- Keunsoo Heo (허근수) — met in 9 rounds, never finished ahead
- Hyunjo Kim (김현조) — met in 8 rounds, finished ahead 5 times
- Choi Goho (최고호) — met in 8 rounds, finished ahead once
Next targets
- A sub-5 Skewb single — 13,285 people have one; it is 0.53 away.
- A sub-20 3×3 single — 113,584 people have one; it is 0.45 away.
Targets move as he improves.