| Piiroinen vs Clive | 26–25 | 50.98% |
| Piiroinen vs King | 15–26 | 36.59% |
| Piiroinen vs Dragunov | 19–18 | 51.35% |
| Piiroinen vs Lidia | 19–17 | 52.78% |
| Piiroinen vs Reina | 25–9 | 73.53% |
| Piiroinen vs Jin | 13–17 | 43.33% |
| Piiroinen vs Steve | 17–9 | 65.38% |
| Piiroinen vs Heihachi | 14–10 | 58.33% |
| Piiroinen vs Armor King | 9–11 | 45.00% |
| Piiroinen vs Law | 6–12 | 33.33% |
| Piiroinen vs Asuka | 10–5 | 66.67% |
| Piiroinen vs Kazuya | 6–8 | 42.86% |
| Piiroinen vs Fahkumram | 9–5 | 64.29% |
| Piiroinen vs Jun | 7–6 | 53.85% |
| Piiroinen vs Xiaoyu | 9–3 | 75.00% |
| Piiroinen vs Bryan | 3–9 | 25.00% |
| Piiroinen vs Lili | 8–4 | 66.67% |
| Piiroinen vs Paul | 5–6 | 45.45% |
| Piiroinen vs Lee | 8–2 | 80.00% |
| Piiroinen vs Victor | 3–7 | 30.00% |
| Piiroinen vs Alisa | 3–6 | 33.33% |
| Piiroinen vs Miary Zo | 5–4 | 55.56% |
| Piiroinen vs Nina | 2–5 | 28.57% |
| Piiroinen vs Leroy | 6–1 | 85.71% |
| Piiroinen vs Raven | 1–6 | 14.29% |
| Piiroinen vs Eddy | 3–4 | 42.86% |
| Piiroinen vs Hwoarang | 4–2 | 66.67% |
| Piiroinen vs Devil Jin | 1–5 | 16.67% |
| Piiroinen vs Feng | 3–3 | 50.00% |
| Piiroinen vs Claudio | 3–2 | 60.00% |
| Piiroinen vs Kuma | 3–2 | 60.00% |
| Piiroinen vs Panda | 3–2 | 60.00% |
| Piiroinen vs Yoshimitsu | 0–3 | 0.00% |
| Piiroinen vs Leo | 0–2 | 0.00% |
| Piiroinen vs Lars | 2–0 | 100.00% |
| Piiroinen vs Zafina | 2–0 | 100.00% |
| Piiroinen vs Anna | 2–0 | 100.00% |
Limitations
This data is often requested to give insight into which characters you have more trouble with than others, but it is not particularly helpful for that. The main issue is that it is heavily skewed by how strong the opponents you play are.
For example, this data suggests my worst matchup is clearly vs Reina, but that's just because most of those games are vs Yagami.
There is a way to account for this being worked on. The central idea is to assign each matchup a rating vs you which adjusts based on the result, much like the regular rating but also based on the rating of each player. With this, it would give a better summary of how well you perform vs each character.
In the meantime, this page is here to present the data as requested.