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Sigma Chess is a master strength Mac 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.

What's New

Version 6.2.1:
  • Now bundled with the new HIARCS 13.2 engine! This engine is a Universal Binary and thus runs at full speed on Intel Macs. Additionally, a multi processor version is available for even stronger play.
  • NEW Now bundled with the unregistered version of the new Deep Junior 12 engine! (Only runs on Intel Macs).
  • Fixed a bug when deleting games from a collection.
  • Fixed a bug with more...


OS X 10.3 – OS X 10.6.8

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4 15


Current Version (6.x)


Downloads 59,479
Version Downloads 6,706
License Free
Date 15 Mar 2011
Platform OS X / PPC 32
Price Free
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