In today's bridge column, this example was given:
North opened with one diamond. East doubled with (s) Qxx (h)AQxx (d) x (c) ATxxx.
This double technically met my 14 point requirement (12 for high card points, 2 for the singleton in the opposing suit). But I would have refrained from it for two reasons:
1) I have only Qxx in the spade suit. 2) My strongest suit is clubs, which partner would have to bid at the two level.
Upgrade the spade suit to Kxx, or Qxxx, and I would double. Or switch the diamonds and clubs, so that I was doubling with a singleton club and Axxxx in diamonds.
North and South bid to four spades. East West took the KA of clubs, and the ace of hearts. But then South's game depended on two "two way finesses" in spades and diamonds. From the double, he could infer that East did NOT have the Q of diamonds, and he DID have the Q of spades. Meaning that the double gave away crucial information (and the spade suit was too weak to withstand a finesse).
Here's another example of what I mean.
In such cases, should one avoid making a takeout double using this level of "granularity"?