aguahombre, on 2013-January-29, 11:25, said:
The second sentence says "A contestant ALSO claims when he suggests that play be curtailed..." This would imply that play is not curtailed by the mere show of intention to play some winners.
I don't think that's the part that's in question. What makes this difficult is 68D: "After any claim or concession, play ceases". So if "run the spades" is a considered a claim, we have to stop playing when this statement is made, and declarer should then make a statement of how he plans to win tricks after running the suit.
This is why I believe the definition of claim intends that the player state how many of all the remaining tricks he expects to take. All of the claim procedures seem to depend on this assumption.