On Tue, Mar 10, 2009 at 07:16:50AM -0400, Christopher Hickman wrote: >Could somebody explain the ambiguity of this rule in relation to the >null koan? Clearly the null koan doesn't contain any pyramids, let >alone only grounded ones. How could anyone think this could be marked >anything but no? Consider it as boolean logic: "contains only grounded pyramids" can be transformed into "contains no non-grounded pyramids", which clearly _is_ satisfied by the null koan. It is precisely because some players think in boolean terms and others don't that this could be considered ambiguous. (Also, as Daniel pointed out, it makes it easy to lose track of just what's going on on the table.) Roger