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If you are using Emacs, you may find it fast and convenient to use Emacs' built-in facility for navigating the source. Switch to the root directory gnugo-3.6/ and execute the command:
find . -print|grep "\.[ch]$" | xargs etags
This will build a file called gnugo-3.6/TAGS. Now to find any GNU Go function, type M-. and enter the command which you wish to find, or just RET if the cursor is at the name of the function sought.
The first time you do this you will be prompted for the location of the TAGS table. Enter the path to gnugo-3.6/TAGS, and henceforth you will be able to find any function with a minimum of keystrokes.