[archaeolept]

a 3-turn non aggression pact means you must give a 3 turn notice. notice was given on turn 38... 1 turn notice would be an attack the next turn (1 turn later) ie 39... etc.

but, I agree, dealing w/ NAPs is a real pain, prone to confusion and misunderstandings even when everyone has the best intention - and, of course, I've seen people "miscount" often enough. When I cancel a NAP I always say the turn attacks can land, just to make things clear.