Tensai Go

Tensai Go is a go playing program from Unbalance in Japan. It uses the Go++ engine, which has placed among the top three in each tournament entered since 1996 (as of May 2007).

Tensai Go website. Or in Japanese: Strongest Go

other websites : For the uk http://uk.boonty.com/download/tensai-go.html (The website has different websites for different countries select your country in the lower right of the website)