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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 73,281 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 73,281 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 26 competitions since May 2022, he has put 667 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 35,811 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 26 competitions, more competitions than 98% of everyone who has ever competed.

Skewb
best event — top 1.1% of 73,281 all-time
1.89
signature single · Happy Suseong 2025
667
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 / 854
3×39.4811.08
top 6.1%360 / 4,352
5×51:02.351:10.60
top 6.8%73 / 716
4×435.3043.08
top 7.0%147 / 1,308
Clock6.247.48
top 8.1%51 / 536
2×22.423.63
top 8.1%230 / 2,319
Pyraminx4.137.26
top 8.3%131 / 1,271
7×73:06.373:32.17
top 12.3%45 / 254
6×62:05.542:14.55
top 13.5%67 / 329
3×3 one-handed18.7722.51
top 17.2%245 / 966
Megaminx1:27.761:32.36
top 26.7%176 / 524
Square-123.1146.64
top 34.9%155 / 371
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: 3.441.896.4223 Jul 202227 Dec 2025

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 — 7,931 people have one; it is 1.48 away.

Targets move as he improves.