First, in response to the original question, I have brought
http://crawl.chaosforge.org/Majang's_Ca ... lk-Through up to version 20, in one fell swoop jumping three versions.
Second, as the writer of a walkthrough, I want to spill some ink on the question as to why I would spend time and effort on something that is not that much appreciated by really good players. The reason is that this kind of advice helped me a lot to get going in the game, when I knew neither right nor left. In those days I was benefiting from Mr. K's excellent guides, and his equally enjoyable diaries. Reading through these, I understood a lot more about the game and what to do than from collecting the same information (which is available!) on countless individual wiki pages. These pages give you helpful snippets of information, but they never add up to something like a strategy, or a way to go about the game. This you only get from looking at a particular game, as suggested above. But a morgue file does not give you a reasoning behind the decisions the player made at any given time, and it does not exactly tell the reader about the skill training plan the player followed. And a morgue file is not exactly fun to read.
Yes, a walkthrough does not give you an optimal way to play a game, because it cannot account for all the random things the game throws at you; it provides a fairly fixed path to victory, which in many cases could profitably be altered depending on what happens. But once you can accept that, a new player can certainly take advantage from the advice, as long as it is not bad advice.
My (and other) walkthroughs have been criticized for providing bad advice (I have read the relevant threads in this forum), but almost all examples of that have in turn been hotly disputed by others, and in the end it seems to boil down to the fact that some people just don't like walkthroughs, no matter what advice they give. These people I can just warmly invite to heartily ignore all walkthroughs, or to suggest on the talk page as to how they can be improved. Blanket statements such as "all walkthroughs are ridiculously bad" by experienced and successful players might deprive newbies of just what they need to get to their first victory. Had I read these comments here before seeing Mr. K's excellent works, it might have driven me off the game in those days.
Back to the original question: one of the challenges each walkthrough faces is that it becomes a little bit more obsolete with each new version that comes out. I have the choice of watching the walkthrough rot on its page (the choice Mr. K seems to have taken), or investing a lot of time and energy in keeping it up to date. Sometimes this is impossible, when changes to the game render the whole walkthrough irredeemably obsolete (when a species or background gets entirely scrapped, for example). This is the problem with me as the author attaching my name to the walkthrough, which is now something that I regret having done. It scares off people who might be motivated to update things without the permission they believe they need from me. Eventually I may want to turn my back to the game, but then if nobody else feels free to keep it alive, I would probably have to delete my own walkthrough.