The O'Reilly book 'Games, Diversions & Perl Culture: Best of the Perl Journal' (ISBN 9780596003128) has a part on Obfuscated Perl, which covers all contests. I did not find any go program there, but you can see for yourself.

The TPJ issues seem to be available here: http://www.foo.be/docs/tpj/.

EDIT: with code examples being here: http://www.foo.be/docs/tpj/programs/.

Here is the link for the tar archive of code examples for the book from O'Reilly: https://resources.oreilly.com/examples/9780596003128/-/blob/master/tpj3-examples.tar.

Good luck!