Contents

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Sigma Chess 6.1 Main Features

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UCI Engine Support
Sigma Chess 6.1 supports the UCI (Universal Chess Interface) protocol, so you can run other Mac OS X engines in the Sigma Chess GUI. The World Championship strength HIARCS 11 engine is bundled with Sigma Chess. Click here for a list of UCI chess engines for Mac OS X (UCI is not supported on Mac OS 9).

Hosting of Engine Matches
Sigma Chess 6.1 can now host matches between UCI chess engines.

MultiPV
The MultiPV (k-var) option is now available for UCI engines supporting this feature (such as the registered HIARCS 11 engine).

Native OS X Compatility
Sigma Chess 6.1 is a so-called "Carbon" application that runs natively under Mac OS X. Sigma Chess 6.1 also runs on the "Classic" Mac OS version 8.6 or 9.x (providing the CarbonLib extension is installed).

Strong "multi-instance" Chess Engine
Sigma Chess 6.1 can analyze multiple positions/games simultaneously by smoothly multitasking between each engine "instance". You can for example instruct Sigma Chess 6.1 to analyze one or more positions in the background, while you play a game in the frontmost game window.

Position/Opening Line Database Search
In Sigma Chess 6.1 Pro it is now possible to perform database searches on specific board positions and opening lines.

Up to 1 Million Games in Collections
Sigma Chess 5 Pro was limited to 32.000 games, but in Sigma Chess 6.1 Pro collections can contain up to 1 million games! (but obviously sorting and filtering is slower and uses a lot more memory for such large collections, so you might find it more practical to limit your collections to e.g. 100.000 games or less).

Better PGN/EPD support
PGN files can now be opened directly without you first having to create a new empty collection.

HTML Export
Sigma Chess 6.1 can now generate chess related web pages with embedded chess diagrams, annotation text etc (similar to printing). It uses the same piece set naming convention as in ChessBase, so you can use your favorite ChessBase piece sets instead of the standard Sigma Chess HTML piece set. Click here for an example, which shows how the included "Rules of Chess" collection/book looks when exported.

Improved Position Library Support
Now supports standard position classification glyphs (=, +/- etc). Also, you can now easily build your own position library by importing positions from game collections.

Rating History Graph
A new player ELO dialog is included which shows more rating statistics, including an ELO history graph showing the development of the player's ELO rating. In Sigma Chess 6.1 Lite only the results of the first 10 rated games are included.

Multiple Board Sizes
Sigma Chess 6.1 now supports multiple 2D board sizes.

Custom Boards & Color Schemes
You can now define you own custom color scheme and 2D board via the standard Apple Color Picker

Easy and intuitive Clipboard Handling
Copy/paste entire games/positions between game windows and collections.

Many levels and time controls
Including Monitor mode, Solver mode (limited by time and/or score ) and Fischer clocks.

Full support for the ExaChess engine protocol
The engine can thus be used from within ExaChess along with the other engines supported by ExaChess.

View the User's Manual Online

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For a more detailed description of all the features, you can view the user's manual online in HTML format:

View Sigma Chess 6.1 User's Manual (HTML)