Played a game of X-Wing on vassal and the very end of the nubs of my ship went into the side of the base of the other ship. Maybe 1mm or so. The other guy called it an overlap and hence, no action.
While I've never dealt with this situation before, and indeed in actual, physical games, there is a degree of uncertainty so this can probably slip by, well, Vassal is immune to clumsy hands and table bumps and with the zoom function, well, you can see it pretty close-up.
Is there an official ruling on this? Do the guide nubs on the bases count or are they just there for guidance?