I continue my series about decisions in Bridge, and how some of them are simply guesswork where you can be lucky or unfortunate. It is the job of an expert to distinguish those on the long run.
In the hand above, I decided to bid 3♣ like most players. You don't want to let the other side play their preemptive 2♠ contract. But, look what happens!
The way the robots think seem to prevent them from bidding to 4♠ after your intervention as in the bidding below. I have no idea why this is so, and maybe nobody knows exactly why. Double dummy analysis says that you can make it, but the robot did not finesse for the ♠10, and consequently goes down once, just like your 4♣ contract. In matchpoints, this is simply a loss for those who interfere with 3♣. In team, there is no question that you should do it, and even go to 5♣. Chances are too high, that opponents make their game.
Now, should you interfere on the long run or shouldn't you? Clearly, it helps the declarer, and might even lead to some expert finding the finesse in spades. Clearly, it is a nuisance to let the opponents play their preemptive opening. Partner, however, can also balance into the bidding. I do not know the answer, but would intervene any time. And what happens in human tournaments is still another story.
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