gwnn, on 2011-January-11, 09:21, said:
Any overcall has the following purposes (among others)
-find a good partscore
-push opps into a bad partscore
-help partner make a good lead (and often it's a good lead even if we don't have a lot of points there)
-make opps' life more miserable
-show values before opps shut us out
Obviously in some cases some of these scenarios are unlikely or completely unlikely, or perhaps you disagree that some of these are real. That's fine, but I don't think there's any overcalls out there that serve no purpose at all.
I agree with the list of purposes. But here you catch partner with three card support for your overcall and still none of the purposes are really served. The hands have a double fit and still uncovering that fact does no good. The 5
♦ bid has received strong criticism but put yourself into North's place. He sees a lot of shape, a double fit, and goes for it. Give S maybe a point more better arranged, say xxx/ x/Axx/AQxxxx and game looks pretty good (although 5
♣ looks like a better choice than 5
♦). With luck, say putting Kx of clubs with opener, there could be six club tricks, five diamond tricks, one ruff. That's 12 where only 11 are needed, and is asking for a lot, but betting on 11 seems not crazy.
Along with the good results of overcalling there can be some bad ones:
Partner takes you seriously and bids too high or doubles a making contract.
Opponents buy the hand anyway and use the bidding to their advantage in the play.
Opponents use the bidding to help their own auction For example, after 2
♣ if the next player holds AJx he will be bidding his hand to the hilt, especially in NT
Of course I can imagine cases where the overcall will help, mostly if partner has Ax. But often, as here, I think it gets us off to a bad start.
As OP suggests, the blame can be shared. But just for myself, I would not have bid 2
♣and then none of the rest would have happened.