Yes, by completing 90% of the race distance.
Which ever driver is able to freewheel their stricken vehicle further after an incident/failure decides who is classified higher than another, all other things being equal (same number of laps completed, no penalties).
I don't think we've had a race in many years in which there less classified finishers than available points-paying positions. The 2005 United States GP had 6 starters and that worked out great if you had Bridgestones.
Detroit 1984 would be the last one with a full field; exactly six cars finished, but Brundle was disqualified from 2nd place a few months later. (All of Tyrrell's finishes in 1984 were removed from the championship, and subsequent finishes were later adjusted.) So nobody finished 6th.
The 1982 San Marino GP featured 14 starters and 5 actual finishers due to most FOCA-aligned teams sitting out in protest. (The lone non-FISA team? Tyrrell...many of their sponsors were brought in from Michele Alboreto, so Ken didn't want to annoy the sponsors' home race.) Also, Ferrari won but later suffered from a plague upon both houses.
The last normal full-field race without disqualifications, but did not award all available points to finishers, would be 1970 Spanish GP. If you can count the inferno that consumed Jackie Oliver's car (mercifully, not Mr. Oliver) as "normal". After all, he'd would later be involved with Shadow, then Arrows, but most importantly, there's a vague link to Super Aguri.
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