Sigma Chess is one of the best free Mac chess games available to download. It has a true perspective 3D color chess board. Instruct Sigma Chess to annotate games with its analysis, or add your own free text annotations including diagrams and move suffixes. Adjust the playing strength to your own level simply by setting the ELO rating for Sigma Chess, and choose among the many playing modes, levels and styles. You can choose among the various piece sets, board types, types of move notation, colour schemes, the true perspective 3D board etc. Sigma Chess is a master strength Macintosh chess program for both OS X and Classic Mac OS. Here are some key features of "Sigma ... [ read more ]