Chessworks 301 X

Chessworks 301 X is the Mac OS X Carbon build of Mike Bailey's Chessworks 3, a customizable chess game written in REALbasic and published by Ekim Software around 2001. Version 3.0.1 packages the engine as a Carbonized application that runs natively on early Mac OS X while remaining backwards compatible with Mac OS 8 and 9 on PowerPC hardware.

REALbasic Roots

The 3.x series rewrote the original Chessworks codebase in REALbasic, allowing the same source to compile for both Classic Mac OS and Carbon. That cross-target build pipeline is unusual for hobbyist chess software of the era and explains the program's unusually long compatibility window.

Customization

True to the Chessworks tradition, the OS X release lets users skin the board, swap piece sets, and adjust playing style and clock controls. The interface follows Aqua conventions on OS X while preserving the original Platinum-styled UI when launched on Mac OS 9.

Online Play

Chessworks 3 supports online play, originally via IRC-based matchmaking inherited from the 1.x series. The Carbon build keeps that networking layer intact, so two OS X clients - or an OS X client and a Classic-era opponent - can square off across the network.

Distribution

Macintosh Garden mirrors the title as cw3carbon-302.sit, a Stuffit archive containing the Carbonized application bundle and supporting resources. A sibling Classic build is available as ChessWorks3_Carbon.sit for users still booting Mac OS 8 or 9.