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People → China → Zhengkai Xu (徐正凯)

People · China

Zhengkai Xu (徐正凯)

Skewb · top 2.3% of 73,281 all-time · competing since July 2016 · 2016XUZH06

Zhengkai Xu (徐正凯) has been competing for 10 years. His best event is the Skewb: a personal-best single of 2.34, set at Kunshan Side Events 2021, puts him in the top 2.3% of the 73,281 people who have ever been ranked in the event, and 120th in China. Until February 2014, no official Skewb solve in the world had been that fast. Across 37 competitions since July 2016, he has put 993 official solves on the record across 13 events. Solve to solve, his 3×3 times vary about 12% around a typical one, steadier than 78% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 20.94 in July 2016 to 10.28, a 51% improvement. Zhengkai has entered 37 competitions, more competitions than 99% of everyone who has ever competed.

Skewb
best event — top 2.3% of 73,281 all-time
2.34
signature single · Kunshan Side Events 2021
993
official solves on the record
12%
solve-to-solve spread · steadier than 78% of the field

Standing, event by event

vs everyone ever ranked
EventPB singlePB averageAll-time standingChina
Skewb2.344.00
top 2.3%120 / 5,004
4×435.8042.41
top 7.5%758 / 5,926
2×22.434.52
top 8.2%1,205 / 15,796
3×310.2811.46
top 8.3%3,240 / 28,153
Pyraminx4.428.49
top 9.8%1,156 / 10,224
3×3 one-handed18.1121.69
top 15.3%1,509 / 5,922
5×51:17.941:26.22
top 17.5%847 / 2,816
6×62:16.522:37.02
top 18.7%413 / 1,349
7×73:36.103:55.75
top 21.9%439 / 1,261
Megaminx1:25.141:38.05
top 25.0%770 / 1,678
3×3 Fewest Moves42 moves—
early days — 2 solves652 / 1,058
Clock19.3122.77
top 62.6%1,406 / 1,843
Square-140.01—
early days — 3 solves1,086 / 1,362

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

Suzhou Open 2016: 20.94Yangzhou Open 2017: 14.48Kunshan Open 2018: 14.54Suzhou Open 2018: 11.87Wuxi Autumn 2018: 13.68SJTU Winter Open 2018: 13.77Yancheng Spring 2019: 13.80Kunshan Open 2019: 13.78Huzhou Open 2019: 13.93China Championship 2019: 12.62Suzhou Open 2019: 12.57Xuzhou Winter 2019: 12.61Wuxi Winter 2019: 12.06 Shenzhen Good Afternoon 2020: 11.35Nanchang Good Afternoon 2021: 10.73Guangzhou Panyu Afternoon 2021: 11.47Shaoxing Afternoon 2021: 10.72Hangzhou Open PM 2021: 10.61Kunshan Morning 2021: 10.52Xuzhou Open AM 2021: 12.57Rubik's WCA World Championship 2023: 10.68Hefei Winter Open 2023: 10.90Huzhou Open 2024: 11.46Zibo Open 2024: 11.43Shenzhen Nanshan Open 2024: 10.28Deqing Big Cubes Summer 2024: 11.40Xuzhou Autumn 2024: 10.56Rubik's WCA Asian Championship 2024: 11.08Hangzhou Open 2024: 10.90Yancheng Open 2024: 11.46Yancheng Open 2025: 11.44Hefei Open 2025: 11.66Xuzhou Open 2025: 11.39Yancheng Spring Open 2026: 11.3010.2820.942 Jul 201629 Mar 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-2 Skewb single — 1,013 people have one; it is 0.34 away.
  • A sub-30 4×4 single — 2,388 people have one; it is 5.80 away.

Targets move as he improves.