MasterGo
Was a commercial Go database program designed for searching patterns, such as when studying Fuseki and Joseki. The database contained 60132 professional games in a proprietary format (as of May 9 2015). Updates are (were) available to all registered users.
Main site:
http://www.MasterGo.com/mastergo (dead link)
http://hauenstein.nine.ch/mastergo/ (working link)
Distributors
The only known remaining distributor is Hebsacker Verlag
Direct link (in German):
http://www.hebsacker-verlag.de/product_info.php?cPath=59_15&products_id=75

2024 the Authors,
published under the ![Sensei's Library [Welcome to Sensei's Library!]](../../images/stone-hello.png)