mycroft, on 2022-September-13, 08:39, said:
I am well known for being an idiosyncratic (read: wrong) bidder. But I'd really like to know why 1♦ is "standout", and why IMPs matter.
I seem to be the only one advocating against a takeout double, but I'll share my thoughts anyway.
I think a takeout double should be slightly stronger than this. Partner will often raise me to 2M with about 8-9 HCP and a 4cM, or compete to the 3-level with a 5-card suit. I think this will often be the wrong decision opposite this hand, at least in part because my aces are pulling their weight on defence. Swap the aces for two kings and a queen and I would be a lot more comfortable. Also the standard responsive structure over (1
♣)-X-(P)-? is kind of lousy - partner will often have to 'take a view' with a so-so 12 HCP. We also don't stand to gain that much - if the opponents bid and raise clubs, then either they subside in a partscore and we get a second (albeit worse) shot later or they rush to game and we're happy to not have disclosed some of our assets.
Personally I think the main ways taking action can help is by 1) getting to a sharp game, 2) sacrificing over their (club) game or 3) putting on the pressure quickly by getting to the par or total trick level quickly. I think double may help accomplish the first but may also actively harm it (see above, partner will somewhat frequently be rushed into a wrong guess since we don't have our values), and if I double and partner jumps to 2
♥ (4+, 8-11) I'm not actually happy about it so number 3 is at risk as well. If we're sacrificing over 5
♣ we need partner to have significant shape, and partner may act on their own with a hand like that even if we pass. Lastly there's the not insignificant risk of redouble, which always looms when you takeout double on subpar values.
By contrast, 1
♦ at least helps us put on the pressure or sacrifice if partner has a diamond fit, and we can still recover if partner has a major suit (though we'll miss some 4-4 spade fits). It also doesn't promise lots of values, our response structure is very clean and it is difficult to penalise. Some other poster mentioned that 1
♦ increases the bidding space for the opponents (true), but the standard continuations hardly makes use of this (weak/trap pass and double to show exactly 4=4 majors are both infrequent) so I'm not that worried about helping the opps. If they were playing T-Walsh and play system on they also don't use the extra step well, in fact I don't think many people do.
Now for the form of scoring: at IMPs 1-over-1 overcalls can be weak, don't promise a good suit and are trying to fish for a raise from partner. I don't think this suit quality is much of an issue, although of course I would like a better one if available. The goal is not to directly obstruct the auction, but to hope that partner can make a bid on their turn that can obstruct (either through a raise or bidding a major suit). At matchpoints I think bids like this should be much more lead-directing, and therefore typically show a stronger suit. Furthermore, at matchpoints the risk of ending in a diamond partial when we belong in a major suit is significant, while at IMPs I just shrug if we go 2
♦+1 while the field is in 3
♠C. The risks, rewards and expectations are quite different, and I would probably bid 1
♠ at the table at matchpoints (though I confess I wouldn't be able to do it in tempo, so maybe I'd have passed before realising 1
♠ is better).