The event had over 470 entrants, all in one section, which included 28 Grandmmasters. Seven players (all GMs) shared first prize, on 7½ points.
Mark was given an estimated Elo rating of 1500, which of course is far too low for his ability. His tournament performance of 1940 was probably much closer to his true rating. But because his rating was estimated, he didn't qualify for the u1600 rating prize, despite being equal first in that category. Instead, he was awarded a year's subscription to Chess24.
The full crosstable for the event can be viewed here. Mark's number is 244.