Manastorm, on 2015-May-08, 11:57, said:
I don't like this argument, but it reappears often in UI situations. If N was willing to defend 1♦, then surely he is more than willing to defend 2♦.
Therefore pass is a logical alternative.
This argument does appear often in UI situations. But not at the 1 level, and not in an uncontested auction. A "failure to overcall" of a 1
♦ opener says nothing about "willing to defend"; after all, when was the last time you *did* defend a 1-of-a-suit contract? (I did, twice, Wednesday night, but the last time before that was a couple of months ago, and I can't recall the last session it's happened twice). We're still "boxed in system", where pass simply denies the kinds of hands that systemically overcall.
It's when we're competing up to the 3 or 5 level, and both sides have announced their fit suits, and there isn't anything else to "show" except "more ODR" or "more DOR" or "nothing more to say" that "after the tank says 'I want to do something', the fact that you weren't willing to go last time implies that the new information that makes you willing to do it this time is partner's tank."
The auctions are qualitatively different - the difference being "I'm willing to defend 1m if it looks like a misfit to partner" and "I'm not willing to defend two, *now that they've told us there's a fit*".
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)