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* [https://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/d842e67212ab1034 cheaper search ?] by [[James Swafford|James F. Long]], [[Computer Chess Forums|rgcc]], April 27, 1997 » [[Tristram]]
: [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://groups.google.com/d/msg/rec.games.chess.computer/EQxCixpytBg/e1R0a7u1WMsJ Working with moves or with positions] by Guillem Barnolas, [[Computer Chess Forums|rgcc]], February 22, 1998 » [[KC Chess]]
* [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]]
