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'''Check Check''',<br/>
a commercial chess program by [[Wolfgang Delmare]], developed in the late 80s and early 90s, and written in [[C]].
It was a 16-bit [[8086]] and later 32-bit [[x86]] program running on [[IBM PC|PCs]] under [[MS-DOS]] with a pleasant [[GUI]].
Check Check was the first commercial chess program using own three and four men [[Endgame Tablebases]] <ref>[https://www.delmare.de/ki-deeplearning/ KI – Machinelearning – Delmare.de]</ref>, spending the "huge" amount of 16MB [https://en.wikipedia.org/wiki/Hard_disk_drive hard disk] space.