In the past year (2023), Kai Yamamoto (山本快) competed in 9 competitions and 34 rounds across 13 events, from Feb 12th to Nov 26th.
Solves/Attempts
He attempted 147 solves and completed 140.
| Event | Solves | Attempts |
| 3x3x3 Cube | 30 | 30 |
| 3x3x3 One-Handed | 25 | 25 |
| Pyraminx | 19 | 20 |
| Megaminx | 15 | 15 |
| 3x3x3 Blindfolded | 12 | 15 |
| 5x5x5 Cube | 10 | 10 |
| Skewb | 10 | 10 |
| Square-1 | 5 | 5 |
| 4x4x4 Blindfolded | 4 | 6 |
| 6x6x6 Cube | 3 | 3 |
| 7x7x7 Cube | 3 | 3 |
| 3x3x3 Fewest Moves | 3 | 3 |
| 5x5x5 Blindfolded | 1 | 2 |
Personal Bests
He broke his personal best 41 times across 13 events, including 21 singles and 20 averages.
| Event | Times | Single | Average |
| 3x3x3 One-Handed | 5 | 2 | 3 |
| Megaminx | 5 | 2 | 3 |
| Pyraminx | 5 | 3 | 2 |
| 3x3x3 Cube | 4 | 2 | 2 |
| 3x3x3 Blindfolded | 4 | 2 | 2 |
| 5x5x5 Cube | 3 | 1 | 2 |
| Skewb | 3 | 2 | 1 |
| 4x4x4 Blindfolded | 3 | 2 | 1 |
| 6x6x6 Cube | 2 | 1 | 1 |
| 7x7x7 Cube | 2 | 1 | 1 |
| 3x3x3 Fewest Moves | 2 | 1 | 1 |
| Square-1 | 2 | 1 | 1 |
| 5x5x5 Blindfolded | 1 | 1 | 0 |
Improvements of Single
| Event | ≤2022 | 2023 | Improvement |
| Skewb | 6.52 | 3.63 | 2.89 (79.61%) |
| 4x4x4 Blindfolded | 9:10.23 | 5:37.18 | 3:33.05 (63.19%) |
| 3x3x3 Blindfolded | 1:41.41 | 1:10.13 | 31.28 (44.60%) |
| 3x3x3 One-Handed | 15.42 | 11.48 | 3.94 (34.32%) |
| Megaminx | 1:14.39 | 58.56 | 15.83 (27.03%) |
| 3x3x3 Cube | 10.60 | 8.62 | 1.98 (22.97%) |
| 5x5x5 Blindfolded | 20:20.00 | 18:10.00 | 2:10.00 (11.93%) |
| 6x6x6 Cube | 2:21.90 | 2:12.22 | 9.68 (7.32%) |
| 5x5x5 Cube | 1:11.30 | 1:09.88 | 1.42 (2.03%) |
| Pyraminx | - | 4.43 | - |
| 7x7x7 Cube | - | 3:35.32 | - |
| 3x3x3 Fewest Moves | - | 37 | - |
| Square-1 | - | 11.35 | - |
Improvements of Average
| Event | ≤2022 | 2023 | Improvement |
| 3x3x3 Blindfolded | 2:05.36 | 1:19.44 | 45.92 (57.80%) |
| Megaminx | 1:34.47 | 1:09.91 | 24.56 (35.13%) |
| 3x3x3 One-Handed | 17.45 | 14.31 | 3.14 (21.94%) |
| 3x3x3 Cube | 12.32 | 10.64 | 1.68 (15.79%) |
| Skewb | 7.59 | 6.70 | 0.89 (13.28%) |
| 6x6x6 Cube | 2:32.38 | 2:18.32 | 14.06 (10.16%) |
| 5x5x5 Cube | 1:15.98 | 1:12.34 | 3.64 (5.03%) |
| Pyraminx | - | 5.48 | - |
| 4x4x4 Blindfolded | - | 9:07.40 | - |
| 7x7x7 Cube | - | 3:44.16 | - |
| 3x3x3 Fewest Moves | - | 38.67 | - |
| Square-1 | - | 16.33 | - |
Cubers
He met 1416 cubers from 58 countries/regions, 125 of whom competed with him more than once.
| Shared Competitions | Competitors |
| 1 | 1291 |
| 2 | 60 |
| 3 | 40 |
| 4 | 12 |
| 5 | 5 |
| 6 | 7 |
| 7 | 1 |
| All | 1416 |
Regions
He competed in 2 countries/regions.
| Region | Times |
| Japan | 8 |
| Korea | 1 |
