Solve online puzzles.
Solves orthodox proof game problems.
Windows program for solving chess problems - Mates, Self Mates, Helpmates
[Shareware] Mate solver for Win95/Win98/WinNT.
(Freeware, 386+, DOS/Linux) Solves retrograde problems.
[ Commercial-200 Euros] Solves chess/fairychess problems with up to 20 stipulations, 100 aims, 700 fairy pieces, 500 fairy conditions.