| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| — | J2-League | 3 | 46 | 1 | 0 | — | 7 |
| 2016 | J1 League | 14 | 622 | 0 | 0 | 0 | 6.53 |
| 2017 | J1 League | 23 | 1528 | 1 | 0 | 0.06 | 6.85 |
| 2018 | J2-League | 25 | 2058 | 0 | 0 | 0 | — |
| 2019 | J2-League | 6 | 410 | 0 | 0 | 0 | — |
| 2020 | J2-League | 17 | 1366 | 0 | 0 | 0 | — |
| 2021 | J2-League | 20 | 1337 | 1 | 0 | 0.07 | — |
| 2022 | J2-League | 20 | 1395 | 1 | 1 | 0.13 | — |
| 2023 | J2-League | 32 | 1941 | 2 | 0 | 0.09 | — |
| 2024 | J1 League | 4 | 207 | 0 | 0 | 0 | 6.48 |
| 2024 | J2-League | 12 | 554 | 0 | 0 | 0 | — |
| 2025 | J2-League | 32 | 2748 | 0 | 1 | 0.03 | 6.6 |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Cohort: 16 J2-League defenders, 2025, min. 450 minutes. Computed by ranking the full league corpus, not taken from any feed.
Figures computed from the GioScore season-stats database · as of 2026-08-23
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 V-Varen Nagasaki | 5 | 1 | 1 | 3 | 0 | 0 | 0 | 0 |
 Júbilo Iwata | 4 | 2 | 2 | 0 | 0 | 0 | 0 | 0 |
 Vegalta Sendai | 4 | 4 | 0 | 0 | 0 | 0 | 0 | 0 |
 Oita Trinita | 4 | 3 | 1 | 0 | 0 | 0 | 0 | 0 |
 Montedio Yamagata | 4 | 2 | 1 | 1 | 0 | 0 | 0 | 0 |
 Roasso Kumamoto | 4 | 1 | 1 | 2 | 0 | 0 | 0 | 0 |
 Omiya Ardija | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 |
 Consadole Sapporo | 3 | 0 | 1 | 2 | 0 | 0 | 0 | 0 |
 Kyoto Sanga | 3 | 0 | 1 | 2 | 0 | 0 | 0 | 0 |
 Shimizu S-Pulse | 3 | 0 | 1 | 2 | 0 | 0 | 0 | 0 |
 JEF United | 3 | 0 | 1 | 2 | 0 | 0 | 1 | 0 |
 ThespaKusatsu Gunma | 3 | 1 | 2 | 0 | 0 | 0 | 0 | 0 |
 Renofa Yamaguchi | 3 | 2 | 1 | 0 | 0 | 0 | 1 | 0 |
 Ehime | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 |
 Zweigen Kanazawa | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
 Mito Hollyhock | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
 Blaublitz Akita | 3 | 2 | 0 | 1 | 0 | 0 | 0 | 0 |
 Iwaki | 3 | 0 | 2 | 1 | 0 | 0 | 0 | 0 |
 Urawa Reds | 2 | 0 | 2 | 0 | 0 | 0 | 0 | 0 |
 Albirex Niigata | 2 | 0 | 1 | 1 | 0 | 0 | 1 | 0 |
Every direct contribution from Kohei Yamakoshi in the 2025 J2-League was an assist — 1 assist across 32 games (2,748 minutes) — 0.03 goal involvements per 90. His average match rating for that season computes to 6.6. By match rating he ranks in the 88th percentile of a 16-strong pool of J2-League defenders (2025, min. 450 minutes) — better than half the group — goals rank: 9th of 16.
At his best he averaged 6.85 in 2017, J1 League; at his worst, 6.53 in 2016.
