I'm the partner. To reply directly to the above: With my sub-minimal values, a 1♠ response MIGHT find 4-4, but on the more-likely occurrence of a 1N rebid by partner, my "forced" correction to 2♥ would imply more values than I actually had. With essentially a one-call hand (that call being a weak-♥-raise, going through 1N to slow down the auction) I don't want to over bid before having limited my hand. A lot has been said that boils down to "send me to the rubber room" but with my balanced 5HCP including an A, any advance by partner after my 2♥ must show extras, and I have about the top of my weak-raise, 1N-2♥ range, so another call BY ME has to be appropriate. 3♥ is still just a simple, weak preference, and can be done with a LOT less than an A (I'm likely to compete with the same sequence with J-4th and K-3rd...nature of my game is to slow down by starting with a forcing 1N and taking the preference...then competing to 3♥ if the opponents come in). If the continuation over 2♥ had been 2♠, NO WAY would I consider a raise! I know, as responder, that partner has extras, AND I know that we have a fit in ♥. If he really has extra values AND a 4-cd ♠ suit, he could have reversed at his first rebid (which is NOT necessarily game-forcing, as people seem to think a JS to 3♣ would be...). So, now I can decide if my hand WITH 3-cd ♥ support is worth a game (which I think it is) or just a wimpy return to 3♥ (and if I'm not bidding 3♥/2N then I'm not bidding 3-only-♥/2♠ either). AND 2N is an option for me (which partner should correct to 3♥ on his KQJ-6-baggger with a stiff ♦, and he's THEN conveyed his ENTIRE hand). BUT: MY partner's 2N advance implies a balanced hand with extras. And now I think, maybe 9 tricks is easier than 10. Partner never conveyed his ♦ weakness/shortness. And even if I have Jxxx there, without SOLID ♥ what's the point? If he's not passing 2♥, then I have to find the right game with my A+J. 2N just lead me to the wrong guess. So call the rubber room on me...I STILL think that when Opener advances showing a balanced hand opposite no more than a weak preference, responder should be bidding game at IMPs. And with a 4x3, that game seems more likely to be in NT. As may be clear from the above, I also agree with what Mr. Herrmann said.