| Koszczuk vs Kazuya | 10–5 | 66.67% |
| Koszczuk vs Jin | 7–5 | 58.33% |
| Koszczuk vs Eddy | 10–2 | 83.33% |
| Koszczuk vs Heihachi | 6–6 | 50.00% |
| Koszczuk vs Paul | 6–5 | 54.55% |
| Koszczuk vs Hwoarang | 6–5 | 54.55% |
| Koszczuk vs Law | 6–3 | 66.67% |
| Koszczuk vs King | 7–2 | 77.78% |
| Koszczuk vs Bryan | 4–4 | 50.00% |
| Koszczuk vs Yoshimitsu | 5–2 | 71.43% |
| Koszczuk vs Dragunov | 3–4 | 42.86% |
| Koszczuk vs Devil Jin | 2–4 | 33.33% |
| Koszczuk vs Xiaoyu | 4–1 | 80.00% |
| Koszczuk vs Nina | 4–1 | 80.00% |
| Koszczuk vs Zafina | 3–2 | 60.00% |
| Koszczuk vs Anna | 4–1 | 80.00% |
| Koszczuk vs Lili | 4–0 | 100.00% |
| Koszczuk vs Victor | 2–2 | 50.00% |
| Koszczuk vs Clive | 4–0 | 100.00% |
| Koszczuk vs Feng | 2–1 | 66.67% |
| Koszczuk vs Leo | 2–1 | 66.67% |
| Koszczuk vs Claudio | 1–2 | 33.33% |
| Koszczuk vs Leroy | 2–1 | 66.67% |
| Koszczuk vs Fahkumram | 1–2 | 33.33% |
| Koszczuk vs Steve | 0–2 | 0.00% |
| Koszczuk vs Lars | 2–0 | 100.00% |
| Koszczuk vs Shaheen | 0–2 | 0.00% |
| Koszczuk vs Lee | 2–0 | 100.00% |
| Koszczuk vs Jun | 2–0 | 100.00% |
| Koszczuk vs Reina | 2–0 | 100.00% |
| Koszczuk vs Azucena | 0–2 | 0.00% |
| Koszczuk vs Lidia | 0–2 | 0.00% |
| Koszczuk vs Alisa | 0–1 | 0.00% |
| Koszczuk vs Kuma | 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.