[Tuj] No. As a proud shopper at Auchan, though, I have a "Waaouh" card. Because the savings make me say "Waaouh!". Obviously. Yes.

Our local supermarket advertises something it calls a 'Price Commitment'. Since these signs disappear as soon as the so-promoted product increases in price, one has to wonder to what extent this counts as a commitment.

[rab] With the "Whoops!" button, could one undo a winning move? More pertinantly, could one test several options until finding the winning move, if unknown?

[Tuj] (i) Yes and no. (ii) I think so, but would it really matter?

[rab] Yes and no, eh? There's cards close to the chest. I'm too timid to go test it ;)
And regarding the second, in theory, with patience, one could knock off the likes of Mystery Crescent single-handedly.

Yes, but you could do the same thing, albeit more publicly, without the Whoops feature. If anyone ever suspects foul play I can always look at the logs.

I've just acquired a niece - what's the appropriate Unclely response? (Other than a brief note of congratulation).

[rab] No idea!

[rab] Go make a visit, if plausible, and be friendly towards. No point in sending gifts at present (lol) as too young to appreciate them.