Looking for free chess software

I'm looking for free chess playing software without strings attached.

A quick look shows lots of supposedly free offers, but you have to install their toolbar which feeds popups from their advertisers, or it is a 60-minute limited use program that you have to buy, or you have to give your email address so the spammers can attack, or... you get the idea.

Does anybody have any recommendations? I am an adequate player but certainly no expert, it doesn't have to be Grand Master equivalent by any means, just something with selectable skill levels to play a quick game once in a while.

tanstaafl.

I used to use GNU Chess. There are addons for nice-looking chess boards for both Windows and X-Windows.

GNU Chess is quite strong and has selectable skill levels.

Jim
Edit: Get the windows version "WinBoard", with Gnu Chess here.

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I'm looking for free chess playing software without strings attached.

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"There Ain't No Such Thing As A Free Lunch"

Struck me funny. There are more powerful engines that work with WinBoard, by the way. A popular one is called Crafty. But unless you're a really, really serious chess player, I think GNU Chess with WinBoard is what you want.