| Efson vs Jin | 9–10 | 47.37% |
| Efson vs King | 4–10 | 28.57% |
| Efson vs Bryan | 2–11 | 15.38% |
| Efson vs Jun | 5–6 | 45.45% |
| Efson vs Steve | 7–3 | 70.00% |
| Efson vs Fahkumram | 3–7 | 30.00% |
| Efson vs Kazuya | 4–5 | 44.44% |
| Efson vs Azucena | 3–5 | 37.50% |
| Efson vs Yoshimitsu | 4–3 | 57.14% |
| Efson vs Lili | 3–4 | 42.86% |
| Efson vs Heihachi | 3–4 | 42.86% |
| Efson vs Paul | 1–5 | 16.67% |
| Efson vs Claudio | 4–2 | 66.67% |
| Efson vs Reina | 5–1 | 83.33% |
| Efson vs Law | 2–3 | 40.00% |
| Efson vs Asuka | 2–3 | 40.00% |
| Efson vs Eddy | 2–3 | 40.00% |
| Efson vs Xiaoyu | 3–1 | 75.00% |
| Efson vs Clive | 0–4 | 0.00% |
| Efson vs Devil Jin | 1–2 | 33.33% |
| Efson vs Leroy | 2–1 | 66.67% |
| Efson vs Anna | 1–2 | 33.33% |
| Efson vs Hwoarang | 1–1 | 50.00% |
| Efson vs Kuma | 0–2 | 0.00% |
| Efson vs Jack-8 | 1–0 | 100.00% |
| Efson vs Feng | 1–0 | 100.00% |
| Efson vs Dragunov | 0–1 | 0.00% |
| Efson vs Leo | 1–0 | 100.00% |
| Efson vs Lars | 0–1 | 0.00% |
| Efson vs Lee | 0–1 | 0.00% |
| Efson vs Raven | 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.