| Prof. Kostiano vs Reina | 6–6 | 50.00% |
| Prof. Kostiano vs Steve | 6–5 | 54.55% |
| Prof. Kostiano vs Law | 5–5 | 50.00% |
| Prof. Kostiano vs King | 5–5 | 50.00% |
| Prof. Kostiano vs Asuka | 5–5 | 50.00% |
| Prof. Kostiano vs Lili | 4–6 | 40.00% |
| Prof. Kostiano vs Nina | 6–4 | 60.00% |
| Prof. Kostiano vs Hwoarang | 1–8 | 11.11% |
| Prof. Kostiano vs Heihachi | 5–4 | 55.56% |
| Prof. Kostiano vs Jin | 4–4 | 50.00% |
| Prof. Kostiano vs Victor | 4–4 | 50.00% |
| Prof. Kostiano vs Paul | 3–4 | 42.86% |
| Prof. Kostiano vs Shaheen | 3–4 | 42.86% |
| Prof. Kostiano vs Bryan | 0–5 | 0.00% |
| Prof. Kostiano vs Kazuya | 1–4 | 20.00% |
| Prof. Kostiano vs Alisa | 2–3 | 40.00% |
| Prof. Kostiano vs Claudio | 3–2 | 60.00% |
| Prof. Kostiano vs Eddy | 1–4 | 20.00% |
| Prof. Kostiano vs Clive | 0–5 | 0.00% |
| Prof. Kostiano vs Dragunov | 3–1 | 75.00% |
| Prof. Kostiano vs Fahkumram | 4–0 | 100.00% |
| Prof. Kostiano vs Yoshimitsu | 2–1 | 66.67% |
| Prof. Kostiano vs Jack-8 | 1–2 | 33.33% |
| Prof. Kostiano vs Devil Jin | 2–1 | 66.67% |
| Prof. Kostiano vs Leroy | 1–2 | 33.33% |
| Prof. Kostiano vs Anna | 0–3 | 0.00% |
| Prof. Kostiano vs Xiaoyu | 2–0 | 100.00% |
| Prof. Kostiano vs Feng | 2–0 | 100.00% |
| Prof. Kostiano vs Kuma | 0–2 | 0.00% |
| Prof. Kostiano vs Zafina | 2–0 | 100.00% |
| Prof. Kostiano vs Jun | 0–2 | 0.00% |
| Prof. Kostiano vs Lidia | 1–1 | 50.00% |
| Prof. Kostiano vs Leo | 0–1 | 0.00% |
| Prof. Kostiano vs Lars | 0–1 | 0.00% |
| Prof. Kostiano vs Lee | 0–1 | 0.00% |
| Prof. Kostiano vs Panda | 1–0 | 100.00% |
| Prof. Kostiano vs Azucena | 1–0 | 100.00% |
| Prof. Kostiano vs Raven | 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.