1~4
+5, -5
1~9
Rule of 5
1 digit
2 digits 9-7kyu
3 digits 6kyu
4 digits 5kyu
5 digits 4kyu
6 digits
7 digits 3kyu
8 digits
1
2
3
4
5
6
7
8
9
10
12
15
8.0Sec
6.0Sec
5.0Sec
4.0Sec
3.0Sec
2.0Sec
1.5Sec
1.0Sec
0.7Sec
0.5Sec
0.3Sec
?