The next move was to start playing on IGS, which I did tonight. I rated myself conservatively, at 20 kyu  , because a) when I last played regularly and had a rating, it was 10 kyu, but b) that was in Australia, where go ratings are apparently a little inflated compared to the rest of the world, and c) I'd fairly rapidly moved from 13 kyu to 10 kyu, and a decent losing streak could easily have dumped me back down to 13, and d) IGS is known to be quite strong in its rankings, and e) it's been around 8 years since I regularly played Go. I managed to win a few games, even, although in one case, it was because my opponent didn't notice that I'd put 12 stones under threat and played elsewhere, and in a 13x13 game (games are normally played on a 19x19 board) I killed a corner group because my opponent made just the wrong shape and I found the right sequence to kill it. I now have urges to either go berserk buying Go books (the British Go Association seems to have, or read lots of things from the Sensei's Library , or maybe just playing a bunch of games on IGS and seeing how I go (hopefully upwards).
 For amateur players, rankings start at 30 kyu and progress to 1 kyu, then move to 1 dan, and can progress to 6 dan (some competition winners have been declared to be 7 dan, I believe). Professional Go players only have dan rankings, from 1 to 9, and it is generally considered that a 1 dan pro is around the same strength as the stronger amateurs. These days, lots of professional players play on IGS, sometimes using accounts with a "pro" ranking which isn't in the normal rating system, but sometimes using normal rated accounts, starting at 6 dan, and playing their way up to 9 dan (or higher).