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RDChess
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'''RDChess''',<br/>
a free [https://en.wikipedia.org/wiki/Freeware freeware] [[:Category:Open Source|open source chess program]] by [[Rudolf Posch]], written in [[Pascal|Object Pascal]] with [[x86]]/[[MMX]] [[Assembly#InlineAssembly|inline assembly]].
RDChess comes with an own [[Windows]] [[GUI]], written in [[Delphi]], and also has a [[WinBoard]] mode.