The PC-software by chessbase, botht he chess programs and the database, come with immense databses of several hundred thousand matches of the last years, and classical ones. However, I always was turned off by using that. Maybe I am a fossile.
I have a substantial collection of chessbooks, the former GDR publisher Sportverlag had a very good collection of chessbooks until the 80s, and a good encyclopedia of chess openings, of which I own around a dozen books on those themes that I used to play in that time. I make use of that, and consider it to be okay, since it is work nevertheless and is allowed in correspondence chess as well (maybe even expected
). Despite that, a small number of books on strategy and tactics (of which I do not remmber too much anymore
) , and a basic collection of books on principles of endgames. Like so many players, I always disliked endgames, and enver was really strong in that. The ammount of moves one calculates in advance here is a bit beyond my abilities, and I also have no good eye for typical strategic position layouts in endgames. I had several books on chess computers, but somehow I lost them during one of my movements between cities.