pran, on 2018-February-10, 10:54, said:
If he is unsure then that means his highest card (save for continuous ranking cards)
Is that your own interpretation or is it written somewhere?
The Law as it stands does not say that.
BudH, on 2018-February-10, 11:08, said:
That would be better, but it still doesn't cover the situation where the dummy is second to play and holds more than one card that will beat both the card played by LHO and the highest card held by RHO.
I would be more in favour of disallowing such calls and obliging declarer to think for himself.
Plus of course giving dummy the power to refuse any call that does not conform to Law 46 or the cards available.