Should you lead a doubleton? How many times do you want to and refrain as you are indecisive about whether to lead a doubleton?
There are only four reasons to lead a doubleton:
1. Partner bid the suit, lead the top of a doubleton (if you hold 3 or more in the suit lead LOW to show length, but not away from an Ace in a suit contract)
2. It is the only unbid suit, and no other lead stands out.
3. If you have a high card (an Ace or King) in the trump suit and have no decent alternative.
4. You have all the remaining high card points and partner is rated to have zero points - lead passive - from a doubleton.