Today, I experienced the following rather usual situation in a national level pairs tournament (arranged without screens, and in the presence of very experienced and competent international tournament directors, TDs):
I was East and my partner correctly used the stop card when bidding 3♣, and North took what seemed to me an appropriate pause and briefly checked our convention card before passing. I passed, and South made the final pass after a brief consideration.
My opponents have been partners and have participated in national championships for many years. I know them well, as pleasant, fair and friendly. They play 5-card major and weak (12-14) 1NT openings. Both of their 1 Minor openings promise at least 3 cards. They play negative doubles up to the 4-level. I would never expect them to do any conscious illegal signalling at the table, and I believe they do their best to reduce the risk of sending and receiving unauthorized information.
However, I think it should be "mandatory" to make a negative double with hands like the actual one, for all who choose to play and declare the abovementioned conventions. In my opinion, there should be no freedom to sense that this particular time a negative double is too dangerous, whereas another time it would be OK with a similar hand. I am aware that such a decison to pass can be argued by the bidder as e.g., "table feeling", "trying to secure the actual placement in the tournament by avoiding a catastrophe", etc, etc. I am also aware that there will be other hands, which are not as obvious in shape, or where the vulnerability is even less attractive as in the actual example, and where a decision to pass has more substantial arguments.
I decided to call the TD after the board was played, but as I almost expected the TD (very likely rightfully) felt that my protest and call had no merit, since I had not seen been aware of any unauthorized information.
Thank you in advance for any comment or view points on this you will share here.
Niels
PS: we got a high score (90%) on the board winning 10 tricks in 3♣, where the opponents had 10-11 tricks in a ♠ contract, so the reason for bringing it up is purely of general nature.