The draw ratio was heavy early on, but the tournament finished with a good number of decisive games. In the last round, three of the five games finished with a winner, and two of them were of great consequence.
Entering the round, Ian Nepomniachtchi led the tournament by half a point over Fabiano Caruana, while Magnus Carlsen retained a very slight lead over Maxime Vachier-Lagrave in the overall Grand Chess Tour standings. Vachier-Lagrave entered the round half a point ahead of Carlsen, and in the basic case needed to extend that lead by at least another half a point to leapfrog Carlsen to achieve Tour victory.
Unfortunately for the part of the plan that was in his hands, he had Black against Nepomniachtchi, and the two called it a day after just 19 moves. Thus both left their fates in their rivals' hands: Nepo needed Caruana to not win against Michael Adams, and MVL needed Levon Aronian to beat Carlsen. For quite a while it looked like they would both get their wish. Despite having the white pieces, Caruana was slightly worse or at best equal against Adams for a long time, and even implicitly offered a draw by repetition. Adams hadn't had a good tournament, and wasn't really better at that point, but he decided to play on anyway. It proved to be a bad idea: shortly before the time control Adams made a few inaccuracies, and in the second time control lost a difficult pawn-down ending with queens and rooks, then just rooks. By catching up to Nepo, Caruana forced a playoff - more on that below.
As for Carlsen, he was in trouble against Aronian, but he found a very nice, long blockading idea that got him out of most of his trouble. Unfortunately for Aronian, he continued with excessive ambition, first giving away his advantage in pursuit of an interesting piece sac, and then going from drawn (by taking twice on d6 starting at move 39) to lost.
Those were the most important games of the round, and there was a third victory as well. Wesley So defeated Viswanathan Anand with the black pieces, though it wasn't so much a win with Black as it was the opportune exploitation of a big tactical error or two. With Adams, Aronian, and Anand all losing today, it looks like triple-A was the tow-ee today rather than tower. And a strange feature of the tournament is that Black outscored White - as recently happened in St. Louis - provided the playoff isn't taken into account.
First though, the round's other game was a draw between Sergey Karjakin and Hikaru Nakamura. Neither had a great tournament, but what really matters for Karjakin is his form next March in the Candidates tournament.
On to the playoff: Caruana and Nepomniachtchi began with a pair of very well-played draws at g/10 (plus a five second Bronstein delay). With loads of time to rest and prepare it was thought that Nepo would have a significant advantage over Caruana, who needed six hours to overcome Adams, but Caruana played very well. It was then on to a pair of five-minute games (with three seconds' Bronstein delay), and here, surprisingly, Nepomniachtchi faltered. In the first game, with White, he blundered a piece in the opening in a position that was already poor. Resignation wasn't out of the question, but with lots of money at stake and its being a blitz game, Nepo kept going, and somehow managed to hold. It was a virtuoso performance of sorts. In the next game, however, Caruana outplayed his opponent and won a long game. It wasn't perfect, but Caruana was clearly the deserved winner.
Thus Caruana achieved his first-ever victory in a Grand Chess Tour event, while Carlsen gained his second all-around tour victory, the first coming in 2015. (He didn't play in all the events in 2016 due to his world championship match with Karjakin.)
The games are here (with my comments to the three wins in the round proper and brief comments to the last two playoff games), and these are the final standings:
- 1-2. Caruana, Nepomniachtchi 6 (of 9; Caruana first after the playoff)
- 3-5. Vachier-Lagrave, So, Carlsen 5
- 6. Nakamura 4.5 (nine draws!)
- 7. Aronian 4
- 8. Karjakin 3.5
- 9-10. Anand, Adams 3