I've played these 9-12 type of openers a lot, and I would be delighted to have opps play weak jump overcalls. On average, we have more defense than a normal weak two, and really little, if any, more chance of making the contract. My pd and I play double of the overcall as penalty, and it DOES come up, so promiscuous WJOs are risky. Opener's partner knows the combined strength pretty well, so he is well positioned to make a decision. Peter