People · Chinese Taipei
Zhi-Chen Cai (蔡智丞)
3×3 · top 7.5% of 288,433 all-time · competing since May 2021 · 2021CAIZ03
Zhi-Chen Cai (蔡智丞) has been competing for 6 years. His best event is the 3×3: a personal-best single of 9.99, set at Shin Kong Cube Open - Hualien 2026, puts him in the top 7.5% of the 288,433 people who have ever been ranked in the event, and 450th in Chinese Taipei. Until May 2007, no official 3×3 solve in the world had been that fast. Across 12 competitions since May 2021, he has put 189 official solves on the record across eleven events. Solve to solve, his 3×3 times vary about 13% around a typical one; 59% of the 36,406 competitors with ten or more counted rounds hold a tighter spread. His 3×3 best has come down from 13.05 in May 2021 to 9.99, a 23% improvement. He has entered twelve competitions, more competitions than 94% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Chinese Taipei | |
|---|---|---|---|---|---|
| 3×3 | 9.99 | 11.41 | top 7.5% | 450 / 4,369 | |
| 2×2 | 3.47 | 4.74 | top 19.9% | 500 / 1,671 | |
| 3×3 one-handed | 20.41 | 23.16 | top 21.6% | 276 / 805 | |
| 4×4 | 50.75 | 1:00.49 | top 25.8% | 494 / 1,079 | |
| 5×5 | 1:34.98 | — | top 31.5% | 342 / 640 | |
| Pyraminx | 8.42 | 11.56 | top 39.9% | 532 / 1,017 | |
| Skewb | 8.75 | 15.52 | top 46.8% | 424 / 700 | |
| Square-1 | 29.07 | — | top 47.7% | 191 / 323 | |
| 6×6 | 3:19.27 | — | early days — 2 solves | 207 / 293 | |
| Megaminx | 2:29.23 | — | early days — 2 solves | 276 / 363 | |
| 7×7 | 8:29.09 | — | early days — 1 solve | 243 / 252 |
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
- 20 Sep 2026First sub-10 3×3: 9.99 at Shin Kong Cube Open - Hualien 2026.
- 3 Aug 2024Three personal bests in one day at Maru Cube Day Taiwan 2024.
- 27 Jan 2024Five personal bests in one day at Kaohsiung Winter Open 2024.
- 8 Dec 2023Four personal bests in one day at Taiwan Championship 2023.
- 9 May 2021First competition: Welcome Back Kaohsiung 2021. A 13.05 3×3 single to start from.
Competitions
- Shin Kong Cube Open - Hualien 2026 · 20 Sep 2026 — 1 personal best set
- Shin Kong Cube Open - Taitung 2025 · 28 Dec 2025
- Taiwan Championship 2025 · 19 Dec 2025
- Maru Cube Day Taiwan 2025 · 2 Aug 2025 — 1 personal best set
- Taiwan Championship 2024 · 6 Dec 2024 — 1 personal best set
- Maru Cube Day Taiwan 2024 · 3 Aug 2024 — 3 personal bests set
- Kaohsiung Winter Open 2024 · 27 Jan 2024 — 5 personal bests set
- Taiwan Championship 2023 · 8 Dec 2023 — 4 personal bests set
- Taiwan Cubing Challenge 2023 · 18 Jun 2023 — 2 personal bests set
- NDHU Big Cube Day 2023 · 20 May 2023
- Maru Cube Day 2021 · 11 Dec 2021
- Welcome Back Kaohsiung 2021 · 9 May 2021
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.
- Chun-Pao Ni (倪君寶) — met in 41 rounds, finished ahead once
- Chao-Che Chung (鍾肇哲) — met in 41 rounds, never finished ahead
- Chia-Leo Lin (林珈樂) — met in 40 rounds, finished ahead 15 times
Next targets
- A sub-8 3×3 single — 8,101 people have one; it is 1.99 away.
- A sub-3 2×2 single — 27,049 people have one; it is 0.47 away.
Targets move as he improves.