the "not allowed to play chess" was a bit of an exaggeration.
i remember the magazines way back said that true christians would not learn war games, and the magazine specifically mentioned that chess was a game of war. while not coming out and saying: you are not allowed to play chess ... they did heavily imply that true christians would not do so. many dubbies started saying 'the society says you cannot play chess' even though those words didn't specifically appear in that article.
with the word games that the WT$ plays, i think they know the impact that their words will have .. it's all about control.