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Fumiki Koseki (古関章記)

Pyraminx · top 3.7% of 129,321 all-time · competing since September 2005 · 2005KOSE01

Fumiki Koseki (古関章記) has been competing for 21 years. His best event is the Pyraminx: a personal-best single of 3.02, set at Japan Open 2011, puts him in the top 3.7% of the 129,321 people who have ever been ranked in the event, and 54th in Japan. Until February 2008, no official Pyraminx solve in the world had been that fast. Across 130 competitions since September 2005, he has put 2,680 official solves on the record across 15 events. Solve to solve, his 3×3 times vary about 12% around a typical one, steadier than 64% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 47.92 in September 2005 to 11.28, a 76% improvement. Fumiki has entered 130 competitions, more competitions than 99% of everyone who has ever competed.

Pyraminx
best event — top 3.7% of 129,321 all-time
3.02
signature single · Japan Open 2011
2,680
official solves on the record
12%
solve-to-solve spread · steadier than 64% of the field

Standing, event by event

vs everyone ever ranked
EventPB singlePB averageAll-time standingJapan
Pyraminx3.027.28
top 3.7%54 / 688
3×311.2815.07
top 11.4%490 / 3,329
2×23.055.62
top 14.8%198 / 1,021
Skewb5.056.24
top 18.5%94 / 338
4×446.2953.69
top 19.9%202 / 667
Clock9.0111.19
top 20.0%72 / 263
Square-117.8024.54
top 22.9%88 / 245
5×51:25.361:31.91
top 23.6%140 / 420
Megaminx1:23.361:33.93
top 24.0%141 / 313
3×3 one-handed22.2928.80
top 26.8%217 / 529
6×62:34.693:00.34
top 28.0%79 / 209
3×3 Fewest Moves36 moves43.33
top 33.6%103 / 201
7×74:08.024:23.88
top 33.7%75 / 188
3×3 blindfolded2:50.566:17.04
top 49.8%190 / 282
3×3 Multi-Blind2 of 3 cubes · 29:14—
early days — 1 solve118 / 128

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

Japanese Championship 2005: 47.92Tokyo Open 2006: 27.70Japanese Championship 2006: 19.85Machida Open 2007: 20.88Osaka Rubik's Cube contest 2007: 21.96Japan Open 2007: 22.58Kanazawa Open 2007: 21.25World Rubik's Cube Championship 2007: 20.09Japan Open 2008: 17.53Kanazawa Open 2008: 19.25Amagasaki Open 2009: 16.84Osaka Open 2009: 14.63JRCA Kanto Summer 2009: 15.83Japan Open 2009: 17.72Toyama Open 2009: 14.52World Rubik's Cube Championship 2009: 17.68Doshisha Open 2009: 15.05JRCA Kanto Winter 2010: 15.21Japan Open 2010: 16.61Kawasaki Open 2010: 17.1330th Anniversary MegaHouse Cup 2010: 16.84Cube Camp in Kanazawa 2010: 15.55Matsudo Open 2010: 12.68UT Open 2010: 15.75Ishikawa Gokoku Shinto Shrine Open 2010: 15.25Matsudo Spring 2011: 14.93Japan Open 2011: 15.97Cube Camp in Kanazawa 2011: 15.13World Rubik's Cube Championship 2011: 14.56Matsudo Autumn 2011: 15.07Kyotanabe Open 2011: 16.34UT Open 2011: 15.13Hokuriku Eve 2011: 14.88Kansai New Year 2012: 14.53Tsukuba 2012: 14.94Matsudo Spring 2012: 15.47Rabbit and Turtle 2012: 15.63Kyotanabe Open 2012: 16.28Kawasaki Open 2012: 17.06Kansai Star Festival 2012: 15.18Kanto Open 2012: 15.38Cube Camp in Kanazawa 2012: 16.97Hiroshima Open 2012: 14.61Japan Open 2012: 15.19Japan Contest 2012: 14.61West Japan Big Cube 2012: 15.71UT Open 2012: 15.69Kanto Winter 2012: 12.66Hokuriku Eve Open 2012: 14.52Rabbit And Turtle 2013: 17.19Japan Contest Spring 2013: 15.58Kawasaki Open 2013: 14.38Japan Open 2013: 15.71Tachikawa 3x3 Fest 2013: 14.36Cube Camp in Kanazawa 2013: 12.88Kawasaki Autumn 2013: 15.71UT Open 2013: 12.28Kanto Open 2014: 13.40Kansai Open 2014: 15.56Japan Contest Spring 2014: 14.83Kawasaki Spring 2014: 15.11Cube Camp in Kanazawa 2014: 14.75West Japan Big Cube 2014: 13.77Japan Contest Autumn 2014: 13.96Asian Championship 2014: 18.33UT Open 2014: 13.90Tachikawa 3x3 Fest 2014: 14.97Tokyo Pyraminx Open 2015: 15.93Kansai Open 2015: 15.93Japan Contest Spring 2015: 14.56Kawasaki Summer 2015: 14.06East Japan Big Cubes 2015: 13.97Cube Camp in Kanazawa 2015: 15.34Japan Open 2015: 13.50Meguro 3x3 Fest 2015: 13.63Kawasaki Spring 2016: 15.66Japan Open 2016: 13.69Tribox Open Winter 2017: 15.20Suginami Open 2017: 15.42Japan Open 2017: 15.08Tribox Open Spring 2018: 15.73Omiya Bigs 2018: 14.11Tokyo Pyraminx Returns 2018: 11.81Japan Championship 2018: 15.35Ayase 2019: 15.83Tribox Open Spring 2019: 15.05Kurukuru Summer 2019: 15.21Cube Camp in Kanazawa 2019: 14.43Ayase Autumn 2019: 16.33Japan Championship 2019: 13.06Ayase 2020: 15.72Welcome Back Ayase Winter 2020: 13.55Minatomirai 2022: 15.39Yoga Summer A 2022: 16.97Ayase Autumn A 2022: 11.28Tokyo Challenge Winter A 2023: 15.96Hiroshima Spring 2023: 14.31Tokyo Challenge V 2023: 16.73Kanazawa Challenge Spring PM 2023: 12.95Ayase Summer 2023: 18.24Tokyo Challenge VI 2023: 16.23Tokai Open PM 2024: 14.77Shonan PM 2024: 14.98Tokyo Spring PM 2025: 17.63Kanto Spring 2025: 15.49Tokyo Summer 2025: 15.11Kanto Summer PM 2025: 15.38Kanto Autumn PM 2025: 16.28Ota Autumn 2025: 12.97Tokyo Winter 2025: 15.12Kanto Spring 2026: 15.6411.2847.923 Sep 200517 May 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-3 Pyraminx single — 4,700 people have one; it is 0.02 away.
  • A sub-10 3×3 single — 21,172 people have one; it is 1.28 away.

Targets move as he improves.