Free chess programs have changed as the simulations have advanced. All modern programs are really front ends onto a database of chess moves. The granddaddy of on-line chess is FICS here:
To download a program look here:
http://www.chesscentral.com/chess_download/Free_Chess_Software.htm
and here:
http://www.chesszone.org/soft/playchess.html
Hope it helps.
While you are at it please consider downloading the Folding@home program. F@H runs in the background of your system and helps to solve molecular research problems related to Alzheimer's Disease, Huntington's Disease, Parkinson's Disease and many other. It's fascinating to watch and to know that you make a difference. Lookie here:
Thank you for your help!!!
ping