https://bitbucket.org/zurichess/zurichess
Availabe both as UCI ( venatuci ) and XBOARD ( venatxboard ).
There are precompiled versions for all major platforms.
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Download the zip file of the repository ( click on Dowload ZIP )
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Unzip the zip file
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In the unzipped directory go to the atomic directory
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Depending on the protocol you need open the uci or the xboard directory
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Open the directory belonging to your platform ( windows / linux / darwin )
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Open the directory belonging to your processor architecture ( 386 - 32 bit, amd64 - 64 bit )
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The executable for you platform is in this directory, you can run it from here or copy it to a suitable place and run it from there