Nabla scoring has been discussed on BTS forum several times and "use-the-search" -thingie should bring out something. But I'll try to explain it little (probably quite messy but nevertheless)
Basically idea is that mmm, let's say we have 3 scenario fights totally off balance and results are
92-8, 81-19 and 75-25 ... all victories to first mentioned side
Highest score on one side is given full 100(% if you like) ie
92=100, next score gets 81/92*100(%) and last one gets 75/92*100(%)
same thing with other side ie
25=100, next best is 19/25*100(%) and last 8/25*100(%)
Now we have results for both sides: 92 did best for first side and 25 did best for losing side ie 100(%), while second bests are 88(%) [81/92] and 76% [19/25], last but not least results are 81 (%) [75/92] and 32% [8/25].
So final results would be 92 and 25 were equally good while 81 was second best, 75 third best, 19 second last and finally 8 as last.
These results give only little hint about advantage but if we have 3 scenarios which all those pairs play and for each scenario you calculate end results with Nabla you should clearly get distinction between players abilities...
Maybe it was little fuzzy but as I said try BTS and "Nabla" research