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<span id="FractionalPlies"></span>
=Fractional Plies=
Some programs extend or reduce in fractions of one ply. Fractional plies with integers, where one corresponds to 1/N, require a depth resolution of N. Inside an [[Iterative Deepening|iterative deepening]] framework, the search depth is incremented, usually by one ply , N - or by a fraction of one ply, for instance 1/2 ply.
[[Amir Ban]] on [[Junior]] in [[Computer Chess Forums|rgcc]], March 1998 <ref>[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/2163f0fa2f0715f1 Funny Junior Engine in CBLight / Junior Engine ply depth] by Wolfgang Krietsch, [[Computer Chess Forums|rgcc]], February 27, 1998, post 7 and 16 by [[Amir Ban]]</ref> :
