When the bidding polls were originally designed, their URL was in the form of:
http://bridgewinners.com/article/view/bidding-problem-####/ (where #### was a number).
This made it possible to do a number of problems sequentially by changing the URL to refer to the next problem.
Perhaps for speed reasons (as it was taking a long time to post new problems), the URL was changed to a new form, such as:
Where the URL presumably represents the hand and the bidding in coded form.
There should be some way to still enable going through the problems sequentially, perhaps by automatically creating new URLs that redirect to the correct problem. Alternatively, allowing searches of bidding problems that are date restricted would work fine too. There is a lot of valuable material that is not practically accessible with the new coding.
Plus... it's free!