I've been trying to sort out all the files in the "My Documents" section of the computer. These included several lists of "Old Favourites" from previous computers. Naturally a lot of these coincided with those on my current list, but a surprisingly large number of old links have just vanished into the ether. There were quite a number on the "geocities" site which it seems Yahoo took over and closed down. There are now a number of archiving sites where old web pages are kept, for instance the British Library now has a webarchive, and there is an American internet archive based in San Francisco.
This week I received another letter from Professor Donald Knuth, enclosing four chapters on knight's tours from his forthcoming "Fun and Games" book. They cover non-intersecting knight paths, celtic tours (which include no minimal triangles), tours on three-rank boards, and longer leaper tours. As might be expected his idea of "fun and games" extends to some quite complicated mathematics. I'm naturally pleased to see that quite a number of my own results are quoted.