Contents

---

Reviews

---

Awards

---

Visitors

---

Sigma GameWare
Ole K. Christensen
ole@sigmachess.com

Sigma Chess is a master strength Macintosh chess program for both OS X and Classic Mac OS. The feature set includes: Optional HIARCS engine, UCI Engine support, Databases, PGN/EPD, basic desktop publishing, endgame databases, novice levels, a true perspective 3D board, ExaChess compatibility and much more.

About Sigma Chess

---

Welcome to the Sigma Chess home page! If you own a Macintosh and you like chess, you should download Sigma Chess. You can:

Play chess against the strong built-in engine: 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.

Play chess against the World Chess Championship strength HIARCS 12 engine bundled with Sigma Chess: Sigma Chess now supports the UCI (Universal Chess Interface) protocol, so you can use other UCI chess engines for Mac OS X. Click here for a list.

Analyze and annotate games: Instruct Sigma Chess to annotate games with its analysis, or add your own free text annotations including diagrams and move suffixes. You can even write and print your own chess literature.

Maintain & access game collections/databases: The built-in database manager lets you filter and sort large game collections. Additionally you can import PGN game files that you have e.g. downloaded from the internet (see the Selected Chess Links). Sigma Chess can also be used as an engine from within ExaChess.

Customize the appearance & behavior of Sigma Chess: You can choose among the various piece sets, board types, types of move notation, colour schemes, the true perspective 3D board etc.

Sigma Chess Lite & Pro

---

Two versions of Sigma Chess 6.1 exist:

Sigma Chess 6.1 Lite, which is freeware and can be downloaded here. Certain high-end features are either disabled or limited in this free version. Nevertheless, it's a complete, full strength chess program with many features; it's not just a demo. If you're a casual chess player without the need for special features, chances are that Sigma Chess 6.1 Lite will do just fine.

Sigma Chess 6.1 Pro, which is not freeware, but a full featured commercial product. You must pay the $20 fee in order to register and become a legal owner of this version (click here for details on how to register and upgrade).

And now please feel free to visit the remaining pages on this site by selecting the various links in the Contents list at the top left of this page.

The Author

---

Sigma Chess 6.1 is developed by Ole K. Christensen. If you have any questions or comments please send me an e-mail, or check out the FAQ page.