| Eferthium vs King | 40–6 | 86.96% |
| Eferthium vs Law | 25–19 | 56.82% |
| Eferthium vs Jin | 34–10 | 77.27% |
| Eferthium vs Hwoarang | 34–4 | 89.47% |
| Eferthium vs Bryan | 27–9 | 75.00% |
| Eferthium vs Dragunov | 26–8 | 76.47% |
| Eferthium vs Reina | 31–3 | 91.18% |
| Eferthium vs Lars | 27–6 | 81.82% |
| Eferthium vs Kazuya | 23–9 | 71.88% |
| Eferthium vs Steve | 20–11 | 64.52% |
| Eferthium vs Xiaoyu | 21–8 | 72.41% |
| Eferthium vs Lili | 22–7 | 75.86% |
| Eferthium vs Yoshimitsu | 19–8 | 70.37% |
| Eferthium vs Heihachi | 18–5 | 78.26% |
| Eferthium vs Victor | 14–8 | 63.64% |
| Eferthium vs Paul | 17–4 | 80.95% |
| Eferthium vs Armor King | 18–3 | 85.71% |
| Eferthium vs Leo | 12–7 | 63.16% |
| Eferthium vs Claudio | 16–2 | 88.89% |
| Eferthium vs Leroy | 9–8 | 52.94% |
| Eferthium vs Devil Jin | 9–5 | 64.29% |
| Eferthium vs Asuka | 7–6 | 53.85% |
| Eferthium vs Nina | 11–2 | 84.62% |
| Eferthium vs Jun | 9–4 | 69.23% |
| Eferthium vs Alisa | 11–1 | 91.67% |
| Eferthium vs Jack-8 | 9–2 | 81.82% |
| Eferthium vs Lee | 10–1 | 90.91% |
| Eferthium vs Eddy | 7–4 | 63.64% |
| Eferthium vs Lidia | 8–3 | 72.73% |
| Eferthium vs Clive | 7–4 | 63.64% |
| Eferthium vs Azucena | 10–0 | 100.00% |
| Eferthium vs Anna | 6–3 | 66.67% |
| Eferthium vs Kuma | 3–5 | 37.50% |
| Eferthium vs Feng | 5–1 | 83.33% |
| Eferthium vs Raven | 3–3 | 50.00% |
| Eferthium vs Shaheen | 4–1 | 80.00% |
| Eferthium vs Zafina | 4–0 | 100.00% |
| Eferthium vs Panda | 2–1 | 66.67% |
| Eferthium vs Fahkumram | 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.