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The core ideas used in this PHPSkills project were described in
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"TrueSkill (TM): A Bayesian Skill Rating System" available at
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http://research.microsoft.com/apps/pubs/default.aspx?id=67956
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The authors of the above paper have asked for a link to that article
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as attribution in derived works.
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Some concepts were based on sample F# code that was written by Ralf Herbrich
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Copyright (c) 2007, 2008 Microsoft Research Ltd, available at
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http://blogs.technet.com/apg/archive/2008/06/16/trueskill-in-f.aspx
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This PHP code was ported from the C# Moserware.Skills project at
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http://github.com/moserware/Skills
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Both the PHP code in this PHPSkills project and C# in Moserware.Skills are
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Copyright (c) 2010 Jeff Moser <jeff@moserware.com>
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Redistribution and use in source and binary forms, with or without modification, are
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permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this list of
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conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice, this list
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of conditions and the following disclaimer in the documentation and/or other materials
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provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY JEFF MOSER ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JEFF MOSER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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The views and conclusions contained in the software and documentation are those of the
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authors and should not be interpreted as representing official policies, either expressed
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or implied, of Jeff Moser.
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