| Kostas1983 vs King | 10–20 | 33.33% |
| Kostas1983 vs Hwoarang | 3–8 | 27.27% |
| Kostas1983 vs Jin | 4–7 | 36.36% |
| Kostas1983 vs Steve | 5–6 | 45.45% |
| Kostas1983 vs Lars | 3–8 | 27.27% |
| Kostas1983 vs Dragunov | 3–7 | 30.00% |
| Kostas1983 vs Eddy | 0–9 | 0.00% |
| Kostas1983 vs Reina | 3–5 | 37.50% |
| Kostas1983 vs Paul | 1–5 | 16.67% |
| Kostas1983 vs Law | 0–6 | 0.00% |
| Kostas1983 vs Leroy | 4–2 | 66.67% |
| Kostas1983 vs Devil Jin | 4–1 | 80.00% |
| Kostas1983 vs Kazuya | 0–4 | 0.00% |
| Kostas1983 vs Feng | 0–4 | 0.00% |
| Kostas1983 vs Lili | 1–3 | 25.00% |
| Kostas1983 vs Azucena | 2–2 | 50.00% |
| Kostas1983 vs Victor | 0–4 | 0.00% |
| Kostas1983 vs Bryan | 2–1 | 66.67% |
| Kostas1983 vs Asuka | 1–2 | 33.33% |
| Kostas1983 vs Anna | 1–2 | 33.33% |
| Kostas1983 vs Jack-8 | 0–2 | 0.00% |
| Kostas1983 vs Alisa | 0–2 | 0.00% |
| Kostas1983 vs Nina | 0–2 | 0.00% |
| Kostas1983 vs Lee | 2–0 | 100.00% |
| Kostas1983 vs Raven | 0–2 | 0.00% |
| Kostas1983 vs Lidia | 0–2 | 0.00% |
| Kostas1983 vs Fahkumram | 0–2 | 0.00% |
| Kostas1983 vs Xiaoyu | 0–1 | 0.00% |
| Kostas1983 vs Claudio | 0–1 | 0.00% |
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.