People · Republic of Korea
Joon Cha (차준혁)
2×2 · top 2.2% of 186,767 all-time · competing since August 2012 · 2012CHAJ01
Joon Cha (차준혁) has been competing for 14 years. His best event is the 2×2: a personal-best single of 1.50, set at National Capital Region 2013, puts him in the top 2.2% of the 186,767 people who have ever been ranked in the event, and 64th in Republic of Korea. Until November 2008, no official 2×2 solve in the world had been that fast. Across 53 competitions since August 2012, he has put 1,565 official solves on the record across 17 events. Solve to solve, his 3×3 times vary about 13% around a typical one, steadier than 52% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 13.38 in August 2012 to 7.69, a 43% improvement. Joon has entered 53 competitions, more competitions than 99% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Republic of Korea | |
|---|---|---|---|---|---|
| 2×2 | 1.50 | 3.22 | top 2.2% | 64 / 2,319 | |
| 3×3 | 7.69 | 9.33 | top 2.3% | 135 / 4,352 | |
| 3×3 Fewest Moves | 23 moves | 26.67 | top 3.0% | 8 / 173 | |
| Pyraminx | 3.89 | 7.17 | top 7.1% | 117 / 1,271 | |
| 3×3 one-handed | 14.97 | 18.83 | top 8.1% | 114 / 966 | |
| 4×4 | 36.89 | 41.35 | top 8.6% | 171 / 1,308 | |
| Skewb | 3.65 | 6.93 | top 8.6% | 92 / 854 | |
| Clock | 7.40 | 8.34 | top 12.6% | 83 / 536 | |
| 3×3 blindfolded | 1:03.41 | 1:27.12 | top 14.2% | 40 / 217 | |
| 5×5 | 1:13.72 | 1:20.35 | top 14.3% | 150 / 716 | |
| Megaminx | 1:09.68 | 1:17.23 | top 15.4% | 106 / 524 | |
| 3×3 Multi-Blind | 12 of 13 cubes · 59:27 | — | top 15.5% | 15 / 74 | |
| 6×6 | 2:22.36 | 2:35.22 | top 21.7% | 99 / 329 | |
| Square-1 | 18.90 | 27.35 | top 25.5% | 115 / 371 | |
| 7×7 | 3:54.91 | 4:17.27 | top 28.8% | 100 / 254 | |
| 4×4 blindfolded | 6:54.80 | 7:38.18 | top 36.1% | 28 / 48 | |
| 5×5 blindfolded | 18:05.00 | — | early days — 3 solves | 22 / 33 |
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
Best single per competition, 3×3. Faster is higher — the axis is the right way up.
The story so far
- 13 Jun 2025Three personal bests in one day at CubingUSA Southeast Championship 2025.
- 15 Dec 2023Three personal bests in one day at Korean Championship 2023.
- 12 Aug 2023Five personal bests in one day at Rubik's WCA World Championship 2023.
- 15 Apr 2023Four personal bests in one day at Daegu Hot Spring 2023.
- 26 Apr 2014First sub-10 3×3: 9.53 at Toronto Open Spring 2014.
- 26 Apr 2014Three personal bests in one day at Toronto Open Spring 2014.
Competitions
- GA Cubers Pride 2026 · 20 Jun 2026
- GA Cuber Jackets Spring 2026 · 16 May 2026
- Georgia Tech Tuesday Tiny I 2026 · 14 Apr 2026
- Cube Against Cancer Roswell 2026 · 11 Apr 2026
- Marietta Monday Mini III 2026 · 6 Apr 2026 — 1 personal best set
- GA Cubers Warm Up 2026 · 29 Mar 2026
- CubingUSA Southeast FMC Championship 2026 · 29 Mar 2026 — 1 personal best set
- Middle Georgia March Madness 2026 · 21 Mar 2026
- Marietta Monday Mini II 2026 · 16 Mar 2026
- Marietta the Gathering 2026 · 7 Mar 2026
- GA Cubers Banana Mystery 2026 · 28 Feb 2026 — 1 personal best set
- Marietta Monday Mini I 2026 · 9 Feb 2026
- Georgia Championship 2026 · 17 Jan 2026
- Georgia Quiet Championship 2026 · 3 Jan 2026 — 1 personal best set
- Korean Championship 2025 · 27 Dec 2025
- GA Cuber Jackets Fall 2025 · 19 Oct 2025 — 1 personal best set
- GA Cubers Three Bananas 2025 · 5 Oct 2025
- Atlanta Algs at AIS Autumn 2025 · 27 Sep 2025
- CubingUSA Southeast Championship 2025 · 13 Jun 2025 — 3 personal bests set
- Cube Against Cancer Roswell 2025 · 17 May 2025 — 1 personal best set
- Cubing in School Westminster 2025 · 10 May 2025
- Middle Georgia Big Cube Showdown 2025 · 5 Apr 2025 — 2 personal bests set
- GA Cuber Jackets Spring 2025 · 30 Mar 2025 — 1 personal best set
- CubingUSA Southeast FMC Championship 2025 · 29 Mar 2025 — 1 personal best set
- GA Cuber Jackets Warm Up 2025 · 29 Mar 2025
- Atlanta Algs at AIS 2025 · 15 Mar 2025
- GA Cubers Please Banana Quiet 2025 · 15 Feb 2025
- Silent Korea Winter 2024 · 28 Dec 2024 — 1 personal best set
- GA Cubers Go Bananas 2024 · 16 Nov 2024
- GA Cuber Jackets Fall 2024 · 13 Oct 2024 — 2 personal bests set
- Prime Cubing Day Seoul 2024 · 15 Jun 2024 — 1 personal best set
- FMC Korea Spring 2024 · 4 May 2024
- Silent Korea Spring 2024 · 30 Mar 2024 — 1 personal best set
- Anyang Haseyo 2024 · 9 Mar 2024 — 2 personal bests set
- Seoul Open 2024 · 6 Jan 2024 — 1 personal best set
- Korean FMC Championship 2023 · 23 Dec 2023
- Korean Championship 2023 · 15 Dec 2023 — 3 personal bests set
- Suncheon Fall 2023 · 29 Oct 2023
- Ansan Autumn 2023 · 24 Sep 2023 — 1 personal best set
- Rubik's WCA World Championship 2023 · 12 Aug 2023 — 5 personal bests set
- Seoul Spring 2023 · 7 May 2023 — 1 personal best set
- FMC Korea 2023 · 6 May 2023
- Daegu Hot Spring 2023 · 15 Apr 2023 — 4 personal bests set
- 3x3x3 HanMaDang 2017 · 18 Feb 2017 — 1 personal best set
- Busan Summer 2014 · 30 Aug 2014 — 2 personal bests set
- National Capital Region 2014 · 17 May 2014 — 1 personal best set
- Toronto Open Spring 2014 · 26 Apr 2014 — 3 personal bests set
- Montréal Open 2014 · 15 Mar 2014 — 6 personal bests set
- Canadian Open 2013 · 6 Jul 2013 — 6 personal bests set
- National Capital Region 2013 · 18 May 2013 — 5 personal bests set
- Montréal Open 2013 · 23 Mar 2013 — 6 personal bests set
- Toronto Open Winter 2013 · 16 Feb 2013 — 4 personal bests set
- Toronto Summer 2012 · 18 Aug 2012
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.
- Daniel Mullen — met in 163 rounds, finished ahead 19 times
- Katie Hull — met in 157 rounds, finished ahead 10 times
- Clay Moore — met in 147 rounds, finished ahead 114 times
Next targets
- A sub-1 2×2 single — 1,032 people have one; it is 0.50 away.
- A sub-6 3×3 single — 1,376 people have one; it is 1.69 away.
Targets move as he improves.