GM Secrecy and Metagaming

[johndallman]

Originally Posted by Peter Knutsen

I don't see how simple mental arithmetic can be a problem...

Oh, it can. One of the best GMs I know for story and characterisation has to count on their fingers to add up some combinations of 3d6. They don't run GURPS and don't like to play it, calling it "too number-crunchy". They're happy with a fairly simple standard of D&D, or oWoD.