dburn, on Mar 24 2010, 03:44 AM, said:
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East, declarer in 7NT on a heart lead, claims saying "I have them all". Do you allow this claim:
[a] if South has the guarded king of spades
[b] if North has the singleton king of spades
[c] if South has the singleton king of spades
[d] in no circumstances
RMB's answer deals with the original post - neither finessing nor playing for the drop is irrational - and I would make the same decision whether or not a count of the hand indicated that neither North nor South could have more than two spades. Declarer has shown no evidence of the ability to count the hand.
I would add that if North had a singleton spade, I would allow a third-round finesse, and I regard discarding a spade from dummy as worse than careless.
In David's problem we cannot tell the state of mind of the player who claimed. He might have thought the queen of spades was the king (those annoying French cards again). Probably the most likely explanation for the faulty claim is an addition error, but we only have to decide if not taking the spade finesse is irrational. I would award the contract when South has the king of spades, and not otherwise. No doubt David would rule 11 off, cashing the major suit aces and the quing of spades, and misguessing in the one-card ending which minor to keep after the defence cash the majors.
Oh, as an aside, let us say that a player says during the auction "I hate these French court cards". What is the penalty; and what if he says "that is an unusual logo", a remark that clearly indicates he possesses the ace of spades? Both just UI?

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IMO, what is needed is a simpler claim law (for example BBO on-line rules).