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* [http://www.pdp8.net/games/chess.shtml PDP-8 Chess (CHEKMO-II) Instructions] <ref>[http://www.technikum29.de/de/lernprojekte/schach/Chekmo%20II%20%28deutsch,%20ungekuerzt%29.pdf CHEKMO-II German manual] (pdf)</ref>
* [http://www.pdp8.net/pdp8cgi/os8_html/CHEKMO.PA?act=file;fn=images/misc_dectapes/chekmo_misc.tu56;blk=121,252,0;to=auto File CHEKMO.PA (PAL assembler source file)]
* [https://github.com/okalachev/chekmo GitHub - okalachev/chekmo: 1970’s chess engine CHEKMO-II + UCI adapter]
* [http://members.aon.at/nkehrer/pdp8.html Norbert's Emulators | The Atari PDP-8 Emulator | b) Chess program CHEKMO-II]
* [http://web.archive.org/web/20071221115817/http://classicchess.googlepages.com/Chess.htm Classic Computer Chess - ... The programs of yesteryear] by [[Carey Bloodworth|Carey]], hosted by the [https://en.wikipedia.org/wiki/Internet_Archive Internet Archive] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=56938&start=2 Re: Old programs CHAOS and USC] by [[Dann Corbit]], [[CCC]], July 11, 2015</ref>
