Hi! This is a bit of a stretch, but bear with me. You know how the bidding sometimes depends on whether your side has unfavorable, neutral, or favorable vulnerability? And it doesn't matter as to which member of the partnership plays the contract when vulnerability is concerned? Well, check out this idea. The dealer and his LHO are non vulnerable. The other two players are vulnerable. Whether the contract is vulnerable depends on which partner is declarer. What do you think?