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People → Republic of Korea → Jaemin Chang (장재민)

People · Republic of Korea

Jaemin Chang (장재민)

Square-1 · top 0.059% of 25,272 all-time · competing since April 2016 · 2016CHAN09

Jaemin Chang (장재민) has been competing for 10 years. His best event is the Square-1: a personal-best single of 4.20, set at Hong Kong Cube Day 2024, puts him in the top 0.059% of the 25,272 people who have ever been ranked in the event, and 2nd in Republic of Korea. Until February 2023, no official Square-1 solve in the world had been that fast. Across 53 competitions since April 2016, he has put 1,864 official solves on the record across 16 events. Solve to solve, his 3×3 times vary about 12% around a typical one, steadier than 67% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 17.81 in April 2016 to 4.75, a 73% improvement. Jaemin has entered 53 competitions, more competitions than 99% of everyone who has ever competed.

Square-1
best event — top 0.059% of 25,272 all-time
4.20
signature single · Hong Kong Cube Day 2024
1,864
official solves on the record
12%
solve-to-solve spread · steadier than 67% of the field

Standing, event by event

vs everyone ever ranked
EventPB singlePB averageAll-time standingRepublic of Korea
Square-14.206.32
top 0.059%2 / 371
3×34.756.36
top 0.075%5 / 4,352
5×539.4243.05
top 0.13%3 / 716
3×3 one-handed8.0410.54
top 0.21%3 / 966
4×422.7726.03
top 0.29%7 / 1,308
6×61:18.901:30.64
top 0.48%3 / 329
2×20.961.35
top 0.48%9 / 2,319
Skewb1.613.29
top 0.59%5 / 854
Pyraminx2.064.17
top 1.3%27 / 1,271
Megaminx43.3146.70
top 2.5%18 / 524
7×72:23.082:33.65
top 2.7%12 / 254
3×3 blindfolded55.72—
top 11.7%34 / 217
3×3 Fewest Moves30 moves33.67
top 14.8%29 / 173
Clock12.0513.56
top 35.2%233 / 536
4×4 blindfolded12:19.00—
early days — 1 solve39 / 48
3×3 Multi-Blind3 of 4 cubes · 38:15—
early days — 1 solve58 / 74

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

Alpharetta Open 2016: 17.81Korean Championship 2016: 13.563x3x3 HanMaDang 2017: 9.71KAIST Spring 2017: 9.58Play Cube 2017: 10.12Korean Championship 2017: 8.24CWR Fall 2017: 9.26Cubedu Korea 2018: 7.31CWR Winter 2018: 8.17Play Cube 2018: 8.98Korean Championship 2018: 7.20WCA Asian Championship 2018: 6.55Cutory Autumn Open 2018: 7.47Korea Winter 2019: 7.16Seoul Winter 2019: 7.74Cutory Blossom 2019: 7.73Play Cube X4 2019: 5.88Cubing Operating System Summer 2019: 7.69Cube Camp in Wonju 2019: 8.18Korean Championship 2019: 7.75Cubing Korea 2019: 6.52ByeolLae Open 2020: 7.43Korean Championship Mini 2021: 6.51Korean Championship 2022: 6.80Daegu Hot Spring 2023: 6.14Seoul Spring 2023: 6.67Rubik's WCA World Championship 2023: 5.94Suncheon Fall 2023: 6.40Hamchang Open 2023: 6.15Korean Championship 2023: 5.79Seoul Open 2024: 5.68Daegu Cold Winter 2024: 4.75Anyang Haseyo 2024: 6.10Busan Spring 2024: 6.35Prime Cubing Day Seoul 2024: 5.71Korean Championship 2024: 6.25Hong Kong Cube Day 2024: 6.83Brown Fall Seongnam 2024: 5.71Hamchang Winter 2024: 5.68Seoul Winter 2024: 5.94Happy Suseong 2025: 6.29Korea Newcomers PM 2025: 5.63Korean Championship 2025: 5.094.7517.8123 Apr 201627 Dec 2025

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-4 Square-1 single — 11 people have one; it is 0.20 away.
  • A sub-4 3×3 single — 38 people have one; it is 0.75 away.

Targets move as he improves.