While I think that 'Capture the Flag' and 'Hexachess' each have merit, 'Quicksand' has had the most playtesting. ('Amoeba' needs considerably more work.)
Therefore, please keep 'Quicksand' in the contest, and disregard the others for this contest.
BTW, which game rules are you using for playing/judging, the ones listed at icehousegames.org? http://www.icehousegames.org/wiki/index.php?title=Quicksand
Would you like me to update the rule set there with updated grammar and symantics as well as some sample plays/turns?
Thanks,
Erik.