Kierat came up about a year ago when I was browsing around for races. Noted it in the back off my head as a possibility but it was when my running and travel buddy Jakob found out he wanted a Western States lottery ticket and wanted to use Kierat to get it that it ended up in my calendar.
The race has a different approach than most other races and are basicly a 100km orienteering race with 3500 meters of elevation on paper. What you end up with in terms of distance and elevation is up to you on the basis of route choice and your abilities to follow that route while racing. You are given a map with the checkpoints plotted maximum 6 hours before the start, which gives you enough time to plan and mark your route before starting. You are also allowed to use a GPS and others maps if you want. To get the Western States ticket, you have 27 hours to complete the course, but 30 hours is the official time limit.