blackshoe, on 2015-March-11, 19:13, said:
I think we only need an infraction. "No player may base a [snip] play on other information" is pretty strong. Someone who drops a singleton king of clubs offside in a ten-card fit because he believes the old wives' tale is using 16A1d, therefore a legal play. Someone who concludes that the reason for a director call is that someone has the ace-queen of diamonds is basing a play on information not listed above, therefore an illegal play. The TD can adjust under 12A1 if all else fails. If the TD call had not been caused by an infraction by the declarer's side, then I would agree that the information arose from the lawful provisions of the Laws and could be used under 16Ac. If we decide that the TD call by the original non-offenders is A1, then we can rule under Law 23 in that a player could have known that any failure to alert where required could lead to a TD call, and that a TD call would, generally, only be made when someone thought they might be damaged, and that information could well be of value to a putative declarer of the offenders' side. Therefore we adjust.