One of the oldest chess programs for Unix-based computers, GNU Chess has been built and improved since 1984. The current version plays at senior master strength (2500+ Elo on simple hardware). Though console based, there are a number of GUIs available to facilitate play. GNU Chess has been used in numerous research contexts as well as serving as a personal Chess AI for consumers. This release features simplified chess code and modern data structures, which make it more pedantically accessible, easier to modify, and more understandable for skilled chess experts who are not necessarily programmers.
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