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: [https://groups.google.com/group/rec.games.chess.computer/msg/730c03a83bf92807 Re: cheaper search ?] by [[Shaun Press]], [[Computer Chess Forums|rgcc]], April 28, 1997 » [[Vanilla Chess]], [[KnightCap]]
* [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 » [[Unmake Move]]
==2000 ...==
* [https://www.stmintz.com/ccc/index.php?id=312031 The need to unmake move] by [[Mathieu Pagé]], [[CCC]], August 19, 2003 » [[Unmake Move]]
