Klin Zha (Klingon chess) is similar to "Earth" chess in that it is an abstract board game between two players. Pieces move and capture opposing pieces like in chess. It is played on a triangular board with triangular spaces. Initial setup is free: players may arrange their pieces in any manner they choose within their section of the board.
Official website: http://www.tasigh.org/takzh/ (very outdated)
More recent website with extensive rule documents: http://www.klinzha.com
Online study tool: http://www.klinzha.com/study
On klinza.com, there's also a better ruleset that can be used with Zillions of Games. This ruleset is from 2010 and includes all twodimensional Klin Zha variants.