George Duke wrote on Mon, Oct 25, 2010 11:47 PM UTC:
How about combining Polypiece changes with board changes at the same time,
http://www.chessvariants.org/index/msdisplay.php?itemid=MScentralrotatio? Or Betza's own Closing Time, http://www.chessvariants.org/boardrules.dir/closingtime.html, which could mean in as one piece and out as another type. And does not Big Outer(year 1999) have some of the features before Polypiece(2003), or certainly before the above combination of both piece-type and board change suggested by joining Betza's Polypiece and Gifford's Central Rotation? In Blanchard's Big Outer it is change of movement by board position:
http://www.chessvariants.org/large.dir/contest/bigouter.html.