Tengen (天元, center or origin of heaven) is a Go competition in Japan.
The event is held annually, and has run continuously since its inauguration in 1975.
The Tengen competition is a Go tournament run by the Japanese Nihon-Kiin and Kansai-Kiin.
There is a preliminary tournament, which is single knockout, where the winner faces the holder in a best-of-five match.
Instead of the title holder waiting for a challenger, it would be the two Go players left from the single knockout tournament who then played a best-of-five match to determine the holder.