People · Republic of Korea
Siyoon Ko (고시윤)
2×2 · top 8.9% of 186,767 all-time · competing since March 2025 · 2025KOSI01
Siyoon Ko (고시윤) has been competing for a year. His best event is the 2×2: a personal-best single of 2.50, set at Korea Open 2025, puts him in the top 8.9% of the 186,767 people who have ever been ranked in the event, and 264th in Republic of Korea. Until February 2008, no official 2×2 solve in the world had been that fast. Across 2 competitions since March 2025, he has put 20 official solves on the record across two events. Siyoon has entered two competitions.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Republic of Korea | |
|---|---|---|---|---|---|
| 2×2 | 2.50 | 4.93 | top 8.9% | 264 / 2,319 | |
| 3×3 | 13.89 | 16.96 | top 20.6% | 1,120 / 4,352 |
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 story so far
- 15 Aug 2025First sub-15 3×3: 13.89 at Korea Open 2025.
- 8 Mar 2025First competition: Korea Newcomers AM 2025. A 16.54 3×3 single to start from.
Competitions
- Korea Open 2025 · 15 Aug 2025 — 1 personal best set
- Korea Newcomers AM 2025 · 8 Mar 2025
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 4 rounds, finished ahead twice
- Kim Dae Hoon (김대훈) — met in 4 rounds, finished ahead twice
- Youyong Kim (김유용) — met in 4 rounds, finished ahead twice
Next targets
- A sub-2 2×2 single — 8,848 people have one; it is 0.50 away.
- A sub-12 3×3 single — 39,535 people have one; it is 1.89 away.
Targets move as he improves.