Recently I've been working almost exclusively in the Chess Wikiproject to improve articles in List of chess topics. Although I'm not a strong chess player, I have a fair library of chess books that I can use for research. Aside from some article work I can do using the dead tree references I have at hand, I mostly focus on work that can be assisted by writing simple programs, for example, plumbing FIDE data for information on grandmasters or comparing articles under Category:Chess to pages listed in WP:WikiProject Chess/Index of chess articles.
Since I started editing Wikipedia in 2005 it's probably inevitable that I have changed my opinion on a few matters, but looking at old Talk pages I find that sometimes I advocated positions that I don't hold now and don't even remember having held previously. Some examples:
I have noticed several bios of politicians, etc. are in Category:Dutch chess players when no mention is made anywhere in the article of chess. I wonder if someone editing Dutch biographies has used the Dutch chess players category to indicate that the bio is of someone notable who happens to play chess, rather than the correct use of the category for people notable as chess players. Need to ask if we have a chess editor familiar with Dutch chess who can sort this. Also it's possible that if these articles are based on https://nl.wikipedia.org/ then the Dutch Wikipedia might choose to use its Category:Chess players by nationality subcats more liberally and non-chess editors on en.wikipedia couldn't be expected to know that.
Just looked at Johan van Hulst which is a good indication that my concerns may be unfounded since he is a Dutch former politician who won a chess tournament at age 95.