in another thread lummox said
In Australian grading system, there are two grades (15, 16) for 5.8 and another two (17, 18) for 5.9. Sort of like 5.8 and 5.9 - and +. Then for the 5.10 range, they only have three grades, 19, 20, and 21 cover 10a through 10d more or less. Depending which translation you use.
The FRENCH grading system also has only three grades for the 5.10 range, 6a (10a), 6a+ (10b/c), and 6b (10c/d)
Should we change the YDS? Split up 5.8 or 5.9 into two, and shrink 5.10 into three letters? Yes or no? Why or why not?