Yes, the number of races that each of the drivers participated is the first key factor, even if 3 x 4, and this rule has been used by Cossacco here: http://community.sim...e-14#entry12595 (full standings: http://www.simracer.tk/pdc/standings/)
The total number of points as the second tiebreaker (only for 4 x 4 races) rule is something suggested by me, but Cossacco considers Head to Head as a factor is some cases (and me too for 3 x 3 or lower), but only after the first rule. But in both cases Litos76 would win the championship, only Mr_Jolly x Germany which may have some change (remember that we are not considering any penalties).
Interesting. OK that makes it clear what the tie-breaker is, but I don't agree with it. With Launger vs Norbi211 (sounds like a court case), I think Norbi211 should be ahead—he won a race! And head-to-head, he beat Launger 2-1.
The results of the SQ 500-900 Indy Championship illustrates my point even better. If you are considering the three races that count, how can LionHeart88 be denied the championship with two wins?! Head-to-head, he is 2-1 vs both Litos76 and robnitro. It never occurred to me that participation in the fourth race would take precedence over on-track performance. Likewise, with me and Garaith, I have a higher best finish, and head-to-head, I was 3-0 vs Garaith. So I feel like I beat him.
BTW, the chance of ties at the top of the standings can be reduced by increasing the value of podium finishes and especially wins. For example, make a 5-point gap from P3 to P4 and from P2 to P3, and a win should have a larger 7-point gap to P2.
P1 - 75 pts (7 pts over P2)
P2 - 68 pts (5 pts over P3)
P3 - 63 pts (5 pts over P4)
P4 - 58 pts (4 pts over P5)
P5 - 54 pts (4 pts over P6)