If the championship consisted of 15 races, then this would be a tie:
Driver A: 1 1 1 1 1 1 1 DNF DNF DNF DNF DNF DNF DNF DNF
Driver B: DNF DNF DNF DNF DNF DNF DNF DNF 1 1 1 1 1 1 1
Or this:
Driver A: 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2
Driver B: 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1
Or this:
Driver A: 1 1 1 1 1 1 1 2 2 2 2 2 2 2 3
Driver B: 3 2 2 2 2 2 2 2 1 1 1 1 1 1 1
Or this:
Driver A: 1 1 1 1 1 1 1 2 3 4 5 6 7 8 9
Driver B: 2 3 4 5 6 7 8 9 1 1 1 1 1 1 1
Etc.