I play more or less what I think Fred advocates, at least in terms of the 2 level responses:
2♦ is gf. it is the most common response and in essence all it does is to deny any of the other, more precise, responses
2♥: negative. I prefer it merely says no Ace or K, but one of my partners like that it denies any A or K or as much as 6 hcp (eg 3 Q's)
2♠: balanced 8-11 hcp
2N: positive in either major. We do NOT show positive suit responses with 2 suited or 3 suited hands or with significant extras. A suit positive is a simple hand: two of the top 3 honours, 5+ length and probably no more than a side A or King. Stronger or more complex hands go through 2♦ (more on this below)
3♣/♦: positive natural...see above
3♥/♠: 6+ suit, will play for 1 loser opposite stiff...no side A or K
3N: any solid (AKQJxxx) 7 card or better suit...opener will always be able to tell what it is and usually be able to count tricks/place the contract. Of course, I've never seen this response
![:rolleyes:](http://www.bridgebase.com/forums/public/style_emoticons/default/rolleyes.gif)
The main idea is to allow opener to describe his hand rather than to preempt the constructive auction when responder has unexpected values/shape. Assuming that one plays a good method over opener's 2N rebids (which include Kokish after the 2♦ response) it seems best to cater to that.....in my experience, when responder has a complex hand, opener will often rebid 2N. And when he doesn't, responder is often far better off having conserved space than he would be by making a higher level positive and then having opener consume even more space describing his hand.
BTW, the idea of responder grabbing notrump with a balanced hand seems to me to be very ill-advised.