It's going to be really tight isn't it, and I reckon a few of us might have a couple of sleepless nights before the season ends. I truly hope that both Batley and dewsbury take their place in the new Championship next season, but hope and eventuality are two different things.
My back of a fag packet calculations tell me:
The current bottom four will be likely to go down.
The current top four are safe.
Sheffield will have a good run, ending up with at least 48 points.
Workington will do fairly well and get about 45 points.
Dewsbury will get 47 points (I forecast this some time ago and, as yet have no need to change it)
Keighley will get 43 points.
Whitehaven will get 43 points.
So I believe that you will need 45 to be safe, meaning that you need to get a further 10 points from your remaining fixtures. Bonus points will be important for every team involved in this struggle.