Ishi

The Ishi format is a quite old format but there are still a couple of Ishi game files available on the Internet. Those files usually have the suffix .go or .GO. For convinience, gGo can read Ishi format files. They are silently converted to a temporary SGF file and then this SGF is loaded. gGo does not support saving games in Ishi format.

If you need a standalone Ishi to SGF converter, have a look at the glGo SGFTools collection which includes ugf2sgf and ishi2sgf converters. They are also included in the glGo distribution, so if you have this, you do not need the extra converter package.