Coming into round 6 Fabiano Caruana led the Grand Prix tournament in Khanty-Mansiysk by half a point over Sergey Karjakin and Peter Svidler, and at the end of the round it's the same story as all three won. (Leinier Dominguez was also tied for second, and should have finished the day in the tie as well.)
Caruana won a very difficult opposite-colored bishop ending against Alexander Grischuk that saw both players make some mistakes. The evaluation shifted back and forth from betting-to-winning for Caruana back down to a draw, and two moves before the end Grischuk still could have saved the game with perfect play.
Karjakin's win was both easier, cleaner and shorter, as Maxime Vachier-Lagrave continued his downward trajectory with his third loss in a row. White (MVL) was in reasonable shape when he came up with the idea of 21.Rc1 followed by 22.b4, but this didn't restrict anything Karjakin had in mind on the queenside. Black was soon better everywhere and then material ahead, and the game ended before the players reached the first time control.
As for Svidler, he was the sole winner with White on the day, defeating Anish Giri's Ragozin in a long game. After a long siege of Black's isolated d-pawn, it dropped off, and many moves later White's passed d-pawn was the hero that won the day. Svidler did allow much of his advantage to slip at various moments, and on move 65 Black probably would have held with 65...Ra7. (One final chance may have come on move 69: ...Ra4 followed by ...Rd4.) Errare humanum est, and Svidler won in 83 moves.
In the draw department, Boris Gelfand was fortunate - at least on two different stretches - to survive his game with Leinier Dominguez. Evgeny Tomashevsky had the better position for most of his short game with Hikaru Nakamura, but it never reached decisive levels. Finally, Baadur Jobava and Dmitry Jakovenko played an interesting game that saw both players have the advantage at different times, with Jakovenko probably holding the more serious and prolonged chances.
Round 7 comes tomorrow (Thursday), with these pairings: