This Blood Bowl League is using the latest set of NTBB rules.
Living Rulebook 5.0 + Experimental Teams, can be found through this link.
Living rulesbook 6.0 also officially named "Competition Rules Pack", by GW, can be found through this link.
Anyone interested in using the latest and most updated rules - written in an easy to understand language, and with a far better explainations - use this link.Tool:
Very useful playeraid through this link.