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The Middle Three
People → Republic of Korea → SeongYong Yoo (유성용)

People · Republic of Korea

SeongYong Yoo (유성용)

Skewb · top 1.1% of 74,164 all-time · competing since May 2022 · 2022YOOS01

SeongYong Yoo (유성용) has been competing for 4 years. His best event is the Skewb: a personal-best single of 1.89, set at Happy Suseong 2025, puts him in the top 1.1% of the 74,164 people who have ever been ranked in the event, and 14th in Republic of Korea. Until December 2014, no official Skewb solve in the world had been that fast. Across 27 competitions since May 2022, he has put 681 official solves on the record across 13 events. Solve to solve, his 3×3 times vary about 13% around a typical one, steadier than 57% of the 36,406 competitors with ten or more counted rounds. His Skewb best has come down from 6.42 in July 2022 to 1.89, a 71% improvement. SeongYong has entered 27 competitions, more competitions than 98% of everyone who has ever competed.

Skewb
best event — top 1.1% of 74,164 all-time
1.89
signature single · Happy Suseong 2025
681
official solves on the record
13%
solve-to-solve spread · steadier than 57% of the field

Standing, event by event

vs everyone ever ranked
EventPB singlePB averageAll-time standingRepublic of Korea
Skewb1.893.21
top 1.1%14 / 874
3×39.4811.08
top 6.1%363 / 4,390
5×51:02.351:10.60
top 6.9%73 / 725
4×435.3043.08
top 7.0%147 / 1,316
Clock6.247.48
top 8.0%51 / 541
2×22.423.63
top 8.2%234 / 2,334
Pyraminx4.137.26
top 8.4%137 / 1,294
7×73:06.373:32.17
top 12.3%46 / 256
6×62:05.542:14.55
top 13.5%68 / 335
3×3 one-handed18.7722.51
top 17.2%248 / 981
Megaminx1:27.761:32.36
top 26.8%176 / 526
Square-123.1146.64
top 35.0%161 / 383
3×3 Fewest Moves58 moves59.00
early days — 3 solves163 / 173

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

Seoul Summer 2022: 6.42Korean Championship 2022: 4.38KAIST Fall 2022: 3.51Ansan Spring 2023: 2.99Daegu Hot Spring 2023: 2.56Rubik's WCA World Championship 2023: 2.90Korean Championship 2023: 3.22Anyang Haseyo 2024: 2.86Korean Championship 2024: 2.13Daegu Autumn 2024: 3.25Hamchang Winter 2024: 2.53Happy Suseong 2025: 1.89Korean Championship 2025: 3.44Ansan Autumn 2026: 2.751.896.4223 Jul 202219 Sep 2026

Best single per competition, Skewb. Faster is higher — the axis is the right way up.

The story so far

Competitions

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.

Next targets

  • A sub-1 Skewb single — 35 people have one; it is 0.89 away.
  • A sub-8 3×3 single — 8,101 people have one; it is 1.48 away.

Targets move as he improves.