World Federation for Chess Composition
Official site of the governing body that oversees chess composition worldwide.
The society produces The Problemist, perhaps the world’s best chess problem journal.
Prestigious publication of the German chess problem society.
High-quality French magazine devoted to chess problems.
The site of the Yugoslav chess problem magazine, includes an active forum in English.
Online chess problem magazine, features orthodox, fairy and retro compositions.
Comprehensive site of the Dutch endgame study association.
Online chess problem database, holds more than 470,000 problems.
YACPDB (Yet Another Chess Problem Database)
Another database that contains more than 570,000 problems.
Endgame tablebases for positions with up to six pieces.
Endgame tablebases for positions with up to seven pieces.
Free problem solving program, very versatile in dealing with fairy problems (see its Wikipedia entry).
Free program for solving shortest proof games.
Comprehensive listing of chess problem composers with short biographies and sample problems.
An online forum/discussion board devoted to chess problems.
The Retrograde Analysis Corner
An extensive look at retro-analytical problems.
British problemist Brian Stephenson’s site, includes a blog and a problem database.
The site of the Czech problem composer and programmer, with an extensive list of problem-related links.
Slovakian composer Juraj Lorinc’s site, mostly about fairy chess problems.