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: it ran for more than 10 years
reason: it ran from 1997-2010, which is 13 years. not 10.