People · Hong Kong, China
Lam Seon Zi (林信知)
3×3 · top 3.1% of 284,439 all-time · competing since October 2023 · 2023ZILA01
Lam Seon Zi (林信知) has been competing for 3 years. His best event is the 3×3: a personal-best single of 8.15, set at Hong Kong Cube Day 2025, puts him in the top 3.1% of the 284,439 people who have ever been ranked in the event, and 93rd in Hong Kong, China. Until July 2008, no official 3×3 solve in the world had been that fast. Across 9 competitions since October 2023, he has put 277 official solves on the record across ten events. Solve to solve, his 3×3 times vary about 12% around a typical one, steadier than 65% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 12.88 in October 2023 to 8.15, a 37% improvement. Lam has entered nine competitions, more competitions than 91% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Hong Kong, China | |
|---|---|---|---|---|---|
| 3×3 | 8.15 | 9.34 | top 3.1% | 93 / 1,347 | |
| 2×2 | 2.20 | 2.63 | top 6.2% | 85 / 855 | |
| Skewb | 3.40 | 5.99 | top 7.1% | 30 / 285 | |
| 4×4 | 40.97 | 45.35 | top 13.2% | 102 / 423 | |
| 3×3 one-handed | 17.54 | 22.24 | top 13.9% | 81 / 361 | |
| Pyraminx | 5.42 | 7.67 | top 15.9% | 102 / 431 | |
| 5×5 | 1:28.44 | 1:37.79 | top 26.0% | 91 / 192 | |
| Clock | 10.67 | 12.85 | top 28.4% | 70 / 156 | |
| Square-1 | 31.98 | 38.69 | top 53.2% | 90 / 126 | |
| 6×6 | 4:35.59 | — | early days — 1 solve | 80 / 87 |
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
- 12 Jul 2024Four personal bests in one day at Australian Nationals 2024.
- 31 Mar 2024First sub-10 3×3: 8.32 at Welcome Back Hong Kong 2024.
- 31 Mar 2024Five personal bests in one day at Welcome Back Hong Kong 2024.
- 21 Oct 2023First competition: Hong Kong Championship 2023. A 12.88 3×3 single to start from.
Competitions
- Zhuhai Pi Day 2026 · 14 Mar 2026 — 2 personal bests set
- Hong Kong Championship 2025 · 15 Nov 2025
- Hong Kong Side Event Day 2025 · 21 Jun 2025 — 2 personal bests set
- Hong Kong Cube Day 2025 · 7 Jun 2025 — 1 personal best set
- Hong Kong Championship 2024 · 16 Nov 2024 — 2 personal bests set
- Hong Kong Cube Day 2024 · 31 Aug 2024 — 2 personal bests set
- Australian Nationals 2024 · 12 Jul 2024 — 4 personal bests set
- Welcome Back Hong Kong 2024 · 31 Mar 2024 — 5 personal bests set
- Hong Kong Championship 2023 · 21 Oct 2023
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.
- Andy Mok Man Cheuk (莫文卓) — met in 50 rounds, never finished ahead
- Chan Sai Chong (陳世聰) — met in 49 rounds, finished ahead twice
- Yim Cheuk Him (嚴倬謙) — met in 46 rounds, finished ahead 23 times
Next targets
- A sub-8 3×3 single — 7,931 people have one; it is 0.15 away.
- A sub-2 2×2 single — 8,848 people have one; it is 0.20 away.
Targets move as he improves.