People · Netherlands
Koen Roos
Square-1 · top 0.53% of 25,272 all-time · competing since February 2020 · 2020ROOS01
Koen Roos has been competing for 6 years. His best event is the Square-1: a personal-best single of 5.60, set at Dutch Open 2023, puts him in the top 0.53% of the 25,272 people who have ever been ranked in the event, and 3rd in the Netherlands. Until July 2018, no official Square-1 solve in the world had been that fast. Across 14 competitions since February 2020, he has put 460 official solves on the record across eight events. Solve to solve, his 3×3 times vary about 12% around a typical one, steadier than 73% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 11.91 in February 2020 to 7.68, a 36% improvement. Koen has entered 14 competitions, more competitions than 95% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Netherlands | |
|---|---|---|---|---|---|
| Square-1 | 5.60 | 11.63 | top 0.53% | 3 / 407 | |
| 2×2 | 1.37 | 2.74 | top 1.6% | 44 / 1,665 | |
| 3×3 | 7.68 | 9.17 | top 2.2% | 66 / 2,294 | |
| Pyraminx | 4.16 | 7.36 | top 8.5% | 140 / 1,283 | |
| 4×4 | 38.09 | 43.23 | top 9.9% | 85 / 1,000 | |
| Skewb | 4.67 | 6.49 | top 15.7% | 155 / 957 | |
| 3×3 one-handed | 18.46 | 22.90 | top 16.3% | 98 / 726 | |
| 5×5 | 1:25.39 | 1:34.74 | top 23.6% | 117 / 532 |
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
- 14 May 2023Four personal bests in one day at Capelle Cubing 2023.
- 22 Apr 2023Five personal bests in one day at Ermelo Cubing A 2023.
- 17 Apr 2022First sub-10 3×3: 9.07 at Dutch Spring 2022.
- 17 Apr 2022Four personal bests in one day at Dutch Spring 2022.
- 29 Feb 2020First competition: Star Cubing Nijmegen 2020. A 14.18 3×3 single to start from.
Competitions
- Meppel Mayhem 2026 · 30 May 2026 — 1 personal best set
- Arnhem Open 2025 · 28 Jun 2025 — 2 personal bests set
- Rubik's WCA European Championship 2024 · 25 Jul 2024 — 1 personal best set
- Lente Spring 2024 · 7 Apr 2024 — 1 personal best set
- Dutch Nationals 2023 · 25 Nov 2023
- Amsterdam Open 2023 · 10 Sep 2023
- Dutch Open 2023 · 3 Jun 2023 — 2 personal bests set
- Capelle Cubing 2023 · 14 May 2023 — 4 personal bests set
- Ermelo Cubing A 2023 · 22 Apr 2023 — 5 personal bests set
- Kampen Open 2023 · 11 Mar 2023
- Dutch Nationals 2022 · 26 Nov 2022
- Dutch Spring 2022 · 17 Apr 2022 — 4 personal bests set
- Veenendaal Open 2020 · 19 Sep 2020 — 2 personal bests set
- Star Cubing Nijmegen 2020 · 29 Feb 2020 — 2 personal bests set
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.
- Vincent Chan — met in 81 rounds, finished ahead 6 times
- Ivo Stoutjesdijk — met in 68 rounds, finished ahead twice
- Olivier Vos — met in 65 rounds, finished ahead 11 times
Next targets
- A sub-5 Square-1 single — 68 people have one; it is 0.60 away.
- A sub-1 2×2 single — 1,032 people have one; it is 0.37 away.
Targets move as he improves.