[Steve A]

nice quotes <grin>

There is a game explanation for the 2 moves per turn towards the center in a black hole system. The wormholes in a normal system tend to be many AU from the central stars (i.e. at the edge of the screen) and the scale of the solar system display is many AU across.
To make things work assume that wormholes are attracted to gravity gradients, so they are much closer to black holes than normal, equally massive stars. The screen scale of a black hole system would then be much less, say .1 AU across. Since you are much closer to the central mass than you would normally be, the gravitational pull would be greater. Also assume that the "space drive" engines don't have the same top velocity near a singularity, so the ships still only move 1 square per "move".
While not a pretty solution, it can explain the extra motion towards the center. The center square represents the space immediately around the event horizon which causes damage through gravitational shear and/or intense radiation from the accretion disk.

Steve