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The Middle Three
People → Republic of Korea → Chae Jiseok (채지석)

People · Republic of Korea

Chae Jiseok (채지석)

Clock · top 4.6% of 32,048 all-time · competing since July 2008 · 2008JISE02

Chae Jiseok (채지석) has been competing for 18 years. His best event is the Clock: a personal-best single of 5.07, set at Korean Championship 2022, puts him in the top 4.6% of the 32,048 people who have ever been ranked in the event, and 28th in Republic of Korea. Until April 2015, no official Clock solve in the world had been that fast. Across 25 competitions since July 2008, he has put 690 official solves on the record across 15 events. Solve to solve, his 3×3 times vary about 13% around a typical one, steadier than 54% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 1:01.56 in July 2008 to 9.27, an 85% improvement. Chae has entered 25 competitions, more competitions than 98% of everyone who has ever competed.

Clock
best event — top 4.6% of 32,048 all-time
5.07
signature single · Korean Championship 2022
690
official solves on the record
13%
solve-to-solve spread · steadier than 54% of the field

Standing, event by event

vs everyone ever ranked
EventPB singlePB averageAll-time standingRepublic of Korea
Clock5.076.99
top 4.6%28 / 536
3×39.2711.48
top 5.5%329 / 4,352
2×22.303.84
top 7.0%196 / 2,319
4×435.8340.66
top 7.5%157 / 1,308
3×3 one-handed16.7219.96
top 11.9%169 / 966
5×51:13.861:22.63
top 14.4%151 / 716
Pyraminx5.347.48
top 15.4%242 / 1,271
6×62:15.112:25.94
top 18.0%84 / 329
7×73:38.983:45.46
top 23.1%83 / 254
Megaminx1:28.291:43.23
top 27.1%178 / 524
Skewb6.239.81
top 27.6%272 / 854
3×3 Fewest Moves36 moves—
top 33.6%63 / 173
3×3 blindfolded3:02.42—
early days — 3 solves126 / 217
3×3 Multi-Blind2 of 2 cubes · 16:17—
early days — 2 solves53 / 74
Square-151.351:01.54
top 77.3%305 / 371

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

Cheonan Cube Championship 2008: 1:01.56Cubing Korea Xmas Eve 2011: 18.16Cubing Korea January 2012: 22.65Korean Style 2013: 14.96Korea Winter 2015: 11.59Jeonju Spring 2016: 10.63Korean Championship 2016: 10.98KAIST Spring 2017: 10.91Korean Championship 2017: 13.19Korean Championship 2018: 11.96Busan Winter 2018: 12.22Cube Camp in Wonju 2019: 11.84Korean Championship Mini 2021: 12.48Seoul Summer 2022: 10.50Korean Championship 2022: 11.12Cubing SimCheong Open 2022: 9.27KAIST Fall 2022: 10.21Rubik's WCA World Championship 2023: 12.33Daejeon Spring 2025: 12.06Seoul Winter 2026: 11.449.271:01.5627 Jul 200817 Jan 2026

Best single per competition, 3×3. 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-5 Clock single — 1,421 people have one; it is 0.07 away.
  • A sub-8 3×3 single — 7,931 people have one; it is 1.27 away.

Targets move as he improves.