It wasn't a clean or a dominating performance, but it didn't matter: Maxime Vachier-Lagrave did a better job of keeping his nerves and fighting to the last than his rivals, and he was rewarded with the win in the prestigious Superbet Chess Classic.
Going into the last round, Wesley So and Levon Aronian were tied for first, with Vachier-Lagrave half a point behind. With Black against Leinier Dominguez, So was content to make a draw, though by the end he had at least a small advantage. It's easy to criticize this decision, but a good case can be made that it was correct. Just to make up some numbers: maybe he had a 10 percent chance of winning, a five percent chance of losing, and an 85% likelihood of a draw. Those numbers are probably at least somewhat wrong, but I don't think I'm wrong in claiming that a draw is the likeliest outcome. As it was either already known or a dead certainty that in case of a draw he was going to have a playoff with Aronian, and possibly with MVL as well, playing a longer game would leave him with less energy and less time to prepare for that playoff. So I think he made the correct decision - more on that later.
Aronian, as hinted in the preceding paragraph likewise drew his game. In fact, he didn't even try: it was clear as early as move 7 that despite having the white pieces, he was entirely content with an easy draw against Shakhriyar Mamedyarov. Thank goodness for the Sofia rules!
Finally, MVL. He had Black against Alireza Firouzja, and chose a solid line. The game was (generally) balanced for a long time, but both sides passed on opportunities to turn that equality into something irreparably drawish. The tension gradually increased, and it was Firouzja who snapped, and the result was a three-way tie for first.
The day's other games finished in draws - correctly in Deac-Caruana, and anything but in Rapport-Nepomniachtchi (see the game file for details), and it was on to the playoff, a rapid round-robin. In game one, So's rest and preparation paid off with a smooth win with White against Aronian. In game two, Vachier-Lagrave had White against So, and here too So was successful, enjoying first equality and then an advantage. Unfortunately for So, he couldn't maintain it, and was soon on the back foot. In time trouble both sides took turns blundering, but in the end MVL won on time with a winning advantage on the board.
Aronian would need to win with White against MVL to set up a further tiebreak, but it didn't happen. He was soon much worse, and while there were again fluctuations in time pressure MVL again won on time in a winning position, and took tournament victory.
The games, with my comments (to the classical games only) are here. Before giving the final standings, I note that the Grand Chess Tour points were distributed equally among the first-place finishers; Vachier-Lagrave won an extra $10k for winning the playoff.
Final Standings:
1-3. Vachier-Lagrave (first after the playoff), So, Aronian 5.5/9
4-6. Caruana, Dominguez, Deac 4.5
7-8. Firouzja, Nepomniachtchi 4
9-10. Rapport, Mamedyarov 3.5