| Kostey vs Yoshimitsu | 6–10 | 37.50% |
| Kostey vs King | 9–5 | 64.29% |
| Kostey vs Jin | 10–0 | 100.00% |
| Kostey vs Reina | 3–7 | 30.00% |
| Kostey vs Jun | 5–2 | 71.43% |
| Kostey vs Raven | 0–7 | 0.00% |
| Kostey vs Law | 2–4 | 33.33% |
| Kostey vs Hwoarang | 4–2 | 66.67% |
| Kostey vs Lili | 4–2 | 66.67% |
| Kostey vs Victor | 4–2 | 66.67% |
| Kostey vs Asuka | 4–1 | 80.00% |
| Kostey vs Dragunov | 1–4 | 20.00% |
| Kostey vs Leroy | 5–0 | 100.00% |
| Kostey vs Steve | 2–2 | 50.00% |
| Kostey vs Devil Jin | 2–2 | 50.00% |
| Kostey vs Feng | 2–2 | 50.00% |
| Kostey vs Shaheen | 1–3 | 25.00% |
| Kostey vs Bryan | 2–1 | 66.67% |
| Kostey vs Leo | 2–1 | 66.67% |
| Kostey vs Lidia | 1–2 | 33.33% |
| Kostey vs Paul | 0–2 | 0.00% |
| Kostey vs Jack-8 | 1–1 | 50.00% |
| Kostey vs Claudio | 0–2 | 0.00% |
| Kostey vs Kazuya | 1–0 | 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.