WellSpyder, on 2013-February-13, 06:12, said:
This is completely untrue. I have never thought of trying to avoid a careless mistake by claiming, merely of saving everyone time and unnecessary thought. Surely the exact opposite is the case, ie some people avoid claiming in order to avoid a careless error in making the claim?
There is a famous case that appears to suggest a claim by a player might well have the effect of protecting the claimer from his own silly mistakes, even if that was never his intention.
In essence a player claimed on a double squeeze. His opponents asked him to play it out. Despite being a top player, he was apparently unaware that this was not permitted in law. He proceeded to play it out and got mixed up in his mind and played the wrong card at some stage and went off. This was then appealed on the grounds that it shouldn't have been played out, and the claim was good. The appeal committee agreed that it shouldn't have been played out and the claim was good, so it was rescored as making.
As a result of that incident, which predated the present edition of the laws, and which many saw as outrageous, a new law was put in stating that the director can have regard to what cards were in practice played if nevertheless play proceeds after a claim.
But we can see that even with the new law, if the player above had claimed on a double squeeze and refused to play on, he might well have been awarded his claim, even though we now know he could in practice sometimes mess it up. And if you would not be inclined to give anyone a claim on a double squeeze, the same argument can be applied to more routine methods of play that might be more often mentioned in a claim, even a cross-ruff, which people have been known on occasion to mess-up. So the law does, in practice, have the effect of protecting the claimer from a level of carelessness where you fail to follow the line of play you had yourself determined in advance. However, like you, I think it unlikely that players ever claim with the specific intention of protecting themselves from that carelessness.