Premise: The British Chess Variants Society (or BCVS) was an association of chess variant players and developers active between 1997 and 2010. The Society took over publication of "Variant Chess", a chess variant magazine which had been published since 1990; the magazine ceased publication with the dissolution of the Society.
Hypothesis: If you wanted to read Chess Variant magazine you had to be a member of the BCVS as only members were allowed to subscribe.