Mick Reiss's program Go4++ became known as Go++ on May 1st, 2003.
Private.
Runs on Windows.
Described (by its creator) at http://www.reiss.demon.co.uk/webgo/compgo.htm.
Described (by e.g. a reviewer) at 0.
Database of Go-playing progams and programmers, with search. www.computer-go.info