Pass - 1♥ - Pass - 2♦ ==>GF, of course Dbl - 2♥ - 3♣ - 3♦ ===> Is pass forcing or not? I think South pass still forcing, give chance to partner bid 3♦ (show minimum opening with ♦ fit, or rebid 3♥ (extra longth). Now, South can decide which one contract (4♥/5♦), or ask pd about ♠ stopper for 3NT. :(