WCC Opening Preparation x 2

In my earlier post on this blog World Championship Opening Preparation, when I wrote, 'the title of this post is a subject of recurring interest to me', my words were truer than I realized. A few weeks before, I had used exactly the same title for a post on my chess960 blog: World Championship Opening Preparation. The topic on the first post -- 'top level chess games are won (or lost) during home preparation' -- fits perfectly with the thread of the current series, so I'm incorporating it by reference.