People · Republic of Korea
Hyunseung Ko (고현승)
3×3 one-handed · top 0.59% of 74,621 all-time · competing since June 2025 · 2025KOHY02
Hyunseung Ko (고현승) has been competing for a year. His best event is the 3×3 one-handed: a personal-best single of 9.17, set at Osan Summer 2025, puts him in the top 0.59% of the 74,621 people who have ever been ranked in the event, and 11th in Republic of Korea. Until November 2013, no official 3×3 one-handed solve in the world had been that fast. Across 11 competitions since June 2025, he has put 170 official solves on the record across four events. Solve to solve, his 3×3 times vary about 14% around a typical one; 65% of the 36,406 competitors with ten or more counted rounds hold a tighter spread. His 3×3 best has come down from 7.99 in June 2025 to 7.07, a 12% improvement. Hyunseung has entered eleven competitions, more competitions than 93% 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 | 9.17 | 11.72 | top 0.59% | 11 / 981 | |
| 3×3 | 7.07 | 8.01 | top 1.4% | 90 / 4,390 | |
| 3×3 blindfolded | 24.54 | — | top 2.8% | 9 / 222 | |
| 5×5 | 1:07.82 | 1:09.53 | top 10.2% | 108 / 725 |
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
- 17 Jan 2026Three personal bests in one day at Seoul Winter 2026.
- 29 Jun 2025First competition: Osan Summer 2025. A 8.88 3×3 single to start from.
Competitions
- Ansan Autumn 2026 · 19 Sep 2026 — 2 personal bests set
- Korea Open 2026 · 15 Aug 2026 — 1 personal best set
- Silent Korea Open 2026 · 1 Aug 2026
- Anyang Haseyo 2026 · 26 Apr 2026 — 1 personal best set
- Seoul Silent Shhpring 2026 · 18 Apr 2026
- Ansan Favorites 2026 · 7 Feb 2026
- Seoul Winter 2026 · 17 Jan 2026 — 3 personal bests set
- Korean Championship 2025 · 27 Dec 2025 — 2 personal bests set
- Uhseo Osong 2025 · 15 Nov 2025 — 1 personal best set
- Suwon Summer 2025 · 13 Jul 2025 — 1 personal best set
- Osan Summer 2025 · 29 Jun 2025 — 1 personal best set
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.
- Kim Eden (김이든) — met in 34 rounds, finished ahead 22 times
- Ko Youngjin (고영진) — met in 34 rounds, finished ahead 17 times
- Kyeongmin Choi (최경민) — met in 34 rounds, finished ahead 7 times
Next targets
- A sub-8 3×3 one-handed single — 155 people have one; it is 1.17 away.
- A sub-6 3×3 single — 1,419 people have one; it is 1.07 away.
Targets move as he improves.