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==1999==
* [https://www.stmintz.com/ccc/index.php?id=40653 Unmake move v copy the board] by Hugh Cumper, [[CCC]], January 24, 1999
* [https://www.stmintz.com/ccc/index.php?id=60557 Move Make/Unmake Questions] by [[Daniel Homan]], [[CCC]], July 15, 1999
==2000 ...==
* [http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/64f953b94ae312b Does Unmake Move Really Save Time?] by Adrian Jackson, [[Computer Chess Forums|rgcc]], March 08, 2001
