While Peter Svidler didn't win any major events this year until the Russian Championship, he has performed consistently, gaining points in every or almost every event he played in this year. At the moment his rating is 2767.7, just a point and change below his all-time peak rating of 2769, achieved in 2013. He's back up to #10 in the world, and showing (as did players like Viswanathan Anand, Vladimir Kramnik, Boris Gelfand, Vassily Ivanchuk and others) that passing the age of 40 (Svidler is 41) is far from a death sentence for one's career.
Now about the Russian Championship. Entering the last round he was in a four-way tie for first, with three other players half a point behind. A playoff looked likely, and there was one--but it only involved two players. Svidler had White against Vladimir Malakhov - one of the players in the tie - and won cleanly and convincingly in a Spanish Four Knights (via a Berlin move order). The other two players in the tie had the black pieces: Vladimir Fedoseev (against Evgeny Romanov) and Nikita Vitiugov (vs. Sergey Volkov). Fedoseev, who led or co-led throughout the tournament (except in the final standings) was unable to beat the lowest-rated player in the field (though in this field, that's still an extremely strong player), but Vitiugov managed to beat Volkov. (Crushed him, but while he was already better with Black after just 13 moves, he was certainly helped along by the blunderful 14.0-0-0??)
This entailed a two-game playoff between Mssrs. Svidler and Vitiugov. Svidler gradually outplayed his opponent with Black in the first game, and in game two Vitiugov took such extreme risks with Black that he was lost after his 7th(!!) move and resigned on move 18.
So that makes eight Russian championship titles in all: 1994, 1995, 1997, 2003, 2008, 2011, 2013, and 2017. Granted, Vladimir Kramnik, Alexander Grischuk, Sergey Karjakin, and Ian Nepomniachtchi weren't playing, but he has won the title ahead of them as well.
(Speaking of which: Nepo has won the title once, in 2010, and lost in a playoff to Svidler in 2013. Karjakin has never won the title, but he has twice been eliminated in playoffs - in 2010 to Nepomniachtchi and in 2012 in a large playoff that knocked Svidler out as well. Grischuk has won one title, in 2009, and surprisingly Kramnik has never won it - he's 0 for 3.)
Congrats to Peter Svidler!