I am not very interested in the second position, nor do I see why the need to change an interesting problem. As I have said a couple of times when we are set a problem please let us assume it is as in the OP, even if there may be some history in the source of the problem and even if it is different from the source.
While the player's intent is not specifically mentioned in the Laws, when judging what we think a player's likely/logical/possible/irrational lines are I think intent is part of the judgement.
In this case I have little doubt that declarer has assumed the finesse is working, so I would rule he would take it again, and any other line is irrational. So now he goes off if East has Kxx and makes an overtrick if West has Kxxx. Of course, if West had xx I would not force the finesse.
Pict, on Jan 26 2010, 12:40 AM, said:
Not a great example, since even most lesser players might cash their winners after the two spades and all would be clear.
My experience is that lesser players who think a finesse is working routinely take it again immediately.
Personally, I think it an excellent example.
4NT (28-29) - 6NT