hrothgar, on Mar 21 2007, 08:24 AM, said:
However, in each case, I only made one offshape 1NT opening with each partner. .
I think these two sentences sum it up well.
In your regular partnerships, it appears that you don't do it. So if you happened to open 1N on a stiff for whatever reason, partner certainly would not be expecting it, and you probably wouldn't do it again for another 500-1000 hands or more, if ever again.
In the other cases, you were playing with different partners each time, so none of the individual partners could be aware of the fact that you had done this with the others. So if we assumed that you played 12 boards (one 12 bd tourny) with each of the eight different players giving a ratio of 8/96 or approximately 8%. While this is a high percentage for the norm, the fact that you were playing with different people precludes each of them from being aware that you might have a singleton on your NT opening bid. Partner will be as clueless about it as the opponents will, so there is no problem.
Additionally, when you do open 1N with a stiff, it is quite likely that you are able to give some rational explanation as to why you chose this bid, and what rebid problems that you anticipated having in the subsequent auction to justify the opening.

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