aguahombre, on 2012-September-05, 00:57, said:
Since Sathyab mentioned they use neg doubles in this situation, and that doesn't apply to opener but rather to responder ---the question seems to be whether we must double in his given situation to allow for a penalty pass.
This actually came up for me yesterday. At favourable, partner opened a weak NT and RHO overcalled 2♠ on trash. I held ♠KQJx with ♥Ax and passed. Unfortunately partner also passed with ♠Tx so we missed out on the juicy penalty. We discussed afterwards precisely this point - the need to re-open aggressively at the 2 level with a small doubleton in their suit.