In such a big event as Gibraltar I'm not sure how they found the time to check all the games, as there were a number of brilliant games played. Having on site commentators probably helped, as Simon Williams and Jovanka Houska featured the best games from each round, often bringing the winner in for an interview. Even then I saw 2 or 3 games a round that could easily have won such a prize in a smaller event, so making a final decision seemed difficult.
In the end the winner was Veselin Topalov's win over Bogdan-Daniel Deac (if I heard the announcement correctly that is). At the time I first saw it it looked spectacular, and the judge(s) obviously agreed. Topalov allowed Deac to get a black pawn all the way to c2 (forking rooks) but it was all to late as Toplaov had calculated a massive win of material due to the threat of mate on the bank rank. And all in 25 moves.
Topalov,Veselin (2739) - Deac,Bogdan-Daniel (2572) [E04]
Tradewise Masters 2017 Caleta Hotel, Gibraltar (5.12), 28.01.2017