Checkmates.com
Features graphical chess problems with solutions, viewable through a java applet or HTML.
Chess Problem Server
Organized chess problem archive that allows viewing in GIF and ASCII format.
Chess Puzzles by Grand Masters
Includes a range of problems found in games played by grandmasters. Both modern and classic games are listed.
Egalitarian Attacks
A Riddle with Chess pieces. Solving it demands placing on a board combinations of two or more pieces so that all attack the same amount of free squares.
Jon Levitt's Chess Pages
Problems, talent tests, and selected games by British Grandmaster Jon Levitt.
Problemesis
Chess problems magazine in English and French with news, articles, problem contests, a chess glossary, and links.
The BDS Website
Gives information about the British Chess Problem Society and the British Chess Solving Championship.
The Retrograde Analysis Corner
Archive of chess problems where the legality of the position is a key element.
The Retrograde Analysis Corner
About retrogade analysis in chess which is a special category of chess problems.
Tim Krabbé's Chess Curiosities
Chess problems with narrative about how each came about and what really happened after the position. For advanced players.
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