In my clubs we work with two kinds of directors: (1) the ‘logistic’ directors, who set up and run the game, are competent therein but are not qualified as full directors; (2) the ‘arbiters’, who handle irregularities. The former are appointed volunteers who do their work (most) every time the ...
Where I live, pre-alerts are required for ‘agreements to which one can presume that opponents would want to discuss a defense’. Suggested defenses are never required. Apparently in some jurisdictions it is the other way around.