lamford, on 2011-January-12, 18:54, said:
If he had claimed 13 tricks at trick one or two, all these lines exiting with a low spade, or getting to dummy at trick 12 to lose a club, would be regarded as ridiculous. Now you are arguing that they have become normal for this class of player because he miscounted. I don't agree.
The principle of normal lines is only applicable when we don't have a concrete statement or evidence from the player about how he would play. It is there to fill out the missing parts.
If he states a line that is worse than bad or inferior and that plan leads to failure, then he is stuck with that failure. TD should not overrule his plan because the plan is too bad to be normal.
If a player claims where it is clear that he has forgot about a trump, TD should not evaluate if it is normal to count the trumps right and draw the last one. He should instead evaluate what lines are normal given that declarer is known to have forgot the trump.
Same principle in our case. TD should evaluate what lines are normal given that declarer thinks that the 6th spade is not cashing, because declarer's claim can only reasonably be understood as if he thinks that.
So declarer can easily be worse off in a claim situation by saying the wrong things compared to being silent. When he is being silent about the whole play or some part of it, he will at least be allowed to play normally (which can be pretty bad, though). Not so if he indicates that he is about to do something really stupid.
Note that it is clear from § 70 that TD is required to make a full interpretation of declarer's intentions for the remaining tricks based on what declarer says, even when the statement is fuzzy about the precise sequence of play.