Peter Svidler's video series on the Gruenfeld for Chess24 has been widely and correctly praised, and if you play this opening you will want to watch it even if you don't become a premium member of that site. There has been one long-running source of frustration to many of the viewers, however. Svidler sometimes alludes to the "files" where more information was available, but there was no such file. It was coming soon, we were told, but the months went by and no files were in sight.
In some ways this was very understandable. The Chess24 people have clearly been very busy: they're running a burgeoning playing zone, have commentators for most of the big events, write text articles for the web and every so often add another video series or two to their library. Still, it has been around a year and Svidler's Gruenfeld files had not appeared...until now. The long wait is finally at an end, and you can access (or buy) the e-book series here.