FREE Chess GUI for Mac OS X 10.9 that you can play against?

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Unleash_the_Queens

Sigma Chess obviousely does not work. The free version of Shredder, well, I can not configure the ELO of the engine. Most other chess programs are... well... a bit terrible. Do you know any good FREE (by free I mean free 0 dollars, euros, pounds, shekel, yen, whatever) chess programs that work on Mac OS X Mavericks?