Talk:Mathematical chess problem

External links modified (January 2018)
Hello fellow Wikipedians,

I have just modified one external link on Mathematical chess problem. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20110722025232/http://ilib.mirror1.mccme.ru/djvu/bib-kvant/chess.htm to http://ilib.mirror1.mccme.ru/djvu/bib-kvant/chess.htm

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Cheers.— InternetArchiveBot  (Report bug) 11:17, 21 January 2018 (UTC)

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