Sharon, yes, there are still loopholes, is the liar a "perfect liar" or a "pathological liar". I.e, does he always state the opposite to the truth; or does he make the statement most likely to decieve. The "pathological liar" will give the same answer as the truth teller, as this is the answer most likely to decieve. At this stage the whole question becomes too complex to resolve, Unless... you force one of the guards to precede you through the door. Presumably even the liar does not wish to go to Hell, or will his principles make him go in order to mislead you ???......... This thread could run and run.