Posted 2004-August-24, 10:57
You would have to have utter contempt for your partners bridge skills to bid here. He is marked with some hcp of course. If I had to guess, I would say he is on minimum of 11 or 12, unless the opponents have underbid (I assume they don't have 26 points (partner would have 8), 25 pts (he would have 9), or 24 points (he would have 10) since with 24+ they would have tried harder for game.
So what is partners maximum? Well, it could be as much as 16 or 17, but we know (suspect) he would have taken action with that. So let's say he could have around 15 for a realistic max.
Next for some distributional analysis. Partner does not have FIVE spades, or he probably might have bid them, if not the first time, then surely the second time over 2♣. Partner is not 4-4 in the majors or he would have doubled 1♦. So he has 3 or 4 ♠, and with 4♠, a maximum of 3♥. What is his heart minimum? Surely if he had only 1♥, they would have bid hearts again, so he has 2 to 4 hearts.
What about the minors? Partner has at least six cards there, and you have at least a 4-3 fit in diamonds, and maybe a 5-4 or 4-4. The question becomes do you want to press your luck and bid 2♦ on this junk? I suspect, partner is either 4-3-3-3 or 4-2-4-3. or 3-3-4-3. or 3-2-5-3. or on a good day, 3-2-6-2, in this latter case, EAST was temporizing with a three card diamond suit.
So you could feel failry safe bidding 2♦ assuming partner would not get carried away with his 12-14 point "average" range (I think JTFANCLUB hand is not realistic because everyone would either rebid 2♦ with that six card suit or rebid 1NT (this is matchpoints after all).
Against that, at matchpoints, 2♣ is typically not a good contract. I used BridgeBrowser to examine over 1.35 million BBO tournment contract records for 2♣ contract (no double, no redouble). As can be expected, the average matchpoint (and imp score) was below average (and negative at imps). When you look at all 2♣ contracts without regard to vulnerability, the side playing 2♣ averaged ~44%. and an average score (pluses and minus) of aobut +33 (2♣ making would be 90), and an average number of tricks of 8.23. When you examine just the non-vulnerable 2♣ contracts (3897 of them, 1478 of them at matchpoints), the scores got better for the side playing 2♣, presumably due to the defeats costing only 50/trick rather than 100. The average number of tricks won was essentially the same, but the MP (and imp) scores improved. The observed MP score was now nearly 47.3% percent, and the score rose to 47.
So the question becomes do you want to rock the contract that, on average is bad (but not horribly bad) for the opponents? And if so, how do you do it? I think I would always pass here unless I was shooting. My partner's spade and club cards rate to be in front of my RHO (hookable), and my diamond cards are in front of the diamond bidder. Also, what ever heart honors my partner has, they are poorly placed too. In otherwords, honor location on this hand seems VERY. VERY bad for us, and very good for them. This suggest that they are in the wrong contract. With our honors well placed for them, they probably would have scored much better in notrump.
But suppose I wanted to be a hero and push them. After all, if they go to 3♣ our chances for a good result (as compared to 2♣ increase. If I wanted to do something, I would bid 2♦ as I figure that is the best fit we will have. Partner will not take 2♦ too seriously as I couldn't overcall 1♦ on the first round, and he will have a good estimate of my diamond legnth by looking at his and figuring his RHO for four diamonds due to the bid he made. So 2♦ is the safest bid we can make (ohter than pass).
So, pass seems clear to me, but if you JUST GOT TO DO SOMETHING, because a 52.7% score isn't exciting enough for you, then what you have to do is bid diamonds, not double. However, I think the odds favor the opponents being in a worse spot than ohters, as clearly they could play NT, and probably score a lot better (not to mention a possible 4-3 spade fit they might have).
BridgeBrowser is interesting in that it lets you break down the auctions, so among the 4233 non vul 2♣ contracts, you can look at the ones that went 1C=1D=1H=2C all pass to see how those scored. For this analysis, I used pass-1C-1D-1H-2C as the same auction. No ohter bids (and no interference) was allowed. There was 21 such auctions at imps, for an average score of a plus 0.317 imps, and a total of 13 such auctions at matchpoint for an average score of 50.15 score. So while this pool is low, it seems getting to 2♣ by this manner suggest the opponents know more of what they are doing. Still, I guess I would pass...but this is at least some food for thought.
Ben
--Ben--