Expert effectively doubles your skill level, and Master triples it, but it is still possible for the level of a trap to be set above 21, and from memory, those are. I can't remember how high you have to go to open the chests without setting the traps off.[As an aside, the Horn of Ros, in one of those chests, is very useful. I used an editor once to get the Horn of Ros so that I could find out how many hit points Q had. The answer, if you're interested, was 16,000. No wonder he takes some time to kill! He's the only monster in the game who I've been unable to kill purely with Shrapmetal spells; my characters run out of spell points before he drops.]
Similarly, there's a door in the Superior Temple of Baa that requires an astronomical Perception level to get through – Master alone won't go near it. You can get through it if you push your Perception high enough (I did it once), but there are other routes to the corridors behind it, and I don't generally bother with opening the door.
