The Beast of Torrack Moor
An interactive fiction by Linda Wright (2007) - the Inform 7 source text
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This is the need a matching key rule:
if the noun provides the property matching key
begin;
let the item be the matching key of the noun;
if the person asked encloses the item
begin;
change the second noun to the item;
abide by the must have accessible the second noun rule;
otherwise;
if the player is the person asked, say "You lack a key that fits [the noun].";
stop the action;
end if;
otherwise;
if the player is the person asked, say "You lack a key that fits [the noun].";
stop the action;
end if.
Definition: a thing is key-accessible:
if the person asked carries it, yes;
no.