Posted 2007-June-10, 11:15
For me, 2♠ is already a game forcing bid. The logic is as follows. By doubling first and then bidding a new suit you show a hand that was too strong to overcall. If you want to express it in hcp, let's say that it shows 17+, if the double would have been in direct seat. (I know it wasn't here. But we'll get to that in the end.)
The responder to a take out double has several bids to show a positive response. All single jumps in a suit show about 8-11 hcp. If, like me, you like to double aggresively when the shape is perfect, a 1NT response should also show good values. (You don't want to bid 1NT with 6 points and a stopper when the doubler can have a 4441 with 10 nice points. Thus, again for me, a 1NT response to a direct seat take out double shows about 8-11.
If you add the 8-11 from the positive response to the 17+ from the Dbl + new suit, it is clear that you have the strength for game. Thus, a takeout dbl, a positive response and a new suit is GF.
In this case, the Dbl was in the balancing seat, rather than the direct seat. The system stays the same, but the point ranges change. The standard is that the balancer borrows a king from his partner. That means that North should value his hand as 6 hcp and than the 1NT response is an overbid.
The key thing in this discussion is whether you value a 1NT response as a positive action or not. If you do, that makes these auctions (Dbl-1NT; new suit) simple. And if you are an aggressive doubler the 1NT response has to show values.
(You can also look at it another way: The double tells partner to pick a suit. Not obeying your partner [bidding 1NT is not pickking a suit] shows extra values.)
Rik
I want my opponents to leave my table with a smile on their face and without matchpoints on their score card - in that order.
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