4 / (4+ Difference in Level) x 100

​

or 

​

Level Difference 

Between Skill and Enemy Level

​

0 = 100% Accuracy

1 = 80%

2 = 66%

3 = 57%

4 = 50%

5 = 44%

6 = 40%

7 = 36%

8 = 33%

9 = 30%

10 = 29% Accuracy