Join Bridge Winners
All comments by David Levin
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After 1-(1)-2-(3);4-(P)-?, North might bid 4 to convey the double fit opposite a partner who probably has at most one spade. South could then bid 4, and North might then bid the slam but it's tough.
5 hours ago
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Brad Crank?
5 hours ago
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“So, do we agree that if AI can learn to play bridge well, and teach us what it learned, we should learn to trust AI?”

I think it depends on the context. If the valid states and their transitions are givens (as in chess and bridge, for example), then maybe. But in real life, trust in AI would often hinge on one's degree of trust in whoever defined the valid states and transitions.
7 hours ago
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What was meant by “4-4-4-3”?
12 hours ago
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Jim, I'm not sure I grasp the boundary between those two types. Under which would you put the selection of an action by (a) (pseudo-)random generation of a set of layouts consistent with the bidding, (b) double-dummy analysis of each of those layouts to identify what actions work when, and © selecting the action that works more than any other?

(I picked this method because I'd understood it to be fundamental to how AI-based computer-bridgeplayers make decisions. I might be mistaken.)
June 17
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True. (I took Steve M's comment to be contrasting rule-based decision making with AI.)
June 15
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Jim, what do you see as indicating lack of understanding?
June 15
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The team coached by Kehela represented North America.
June 14
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I was under the impression that treating people with respect predated political correctness by several millennia.
June 13
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It took me a while to see that to get from the table in Solution 1 to the conclusion that finessing against East was roughly equivalent to playing for the drop, the number of layouts having a West singleton club should be multiplied by 3/4 (to exclude stiff Q, which either plan handles), and the number of 2-2 layouts should be multiplied by 1/2 (to exclude Qx with East, which again either plan handles).
June 13
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Page 3, third paragraph, “tump coup” -> “trump coup”.
June 12
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Does that mean it must have been Belgium?
June 11
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I don't see how East could expect to gain by not taking the A and returning a heart.
June 11
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“The 6 suggests five cards are outstanding higher - we can see three and West has one more.”

That would depend on the rank of the heart that was omitted from the diagram.
June 11
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A team's telling the opponents that it might be withdrawing after a future set taints the results and doesn't serve a purpose that I can see. I think it's fine if a team wants to inform an official about a possible future withdrawal so that the tournament staff can make contingency plans.
June 11
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It would be useful to know the spot cards added to the declaring side's hands or played by the defenders. But, I'm placing the A with West, who I'm guessing refrained from rising and playing hearts from the top in case Declarer started with Q98x. For West not to be afraid that the Q is Declarer's ninth winner, West probably anticipates getting in with the Q. So, I cross to a high spade and lead the J for a finesse.

Added: I'm not saying that I agree with West's duck at Trick 2.
June 11
David Levin edited this comment June 11
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What were the ranks of the 13th cards for North and South? And what spots did the defenders play at Trick 2?
June 10
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Doubling seems a likely winner here. Both defenders can infer that the declaring side doesn't have longer spades than clubs. This suggests that leading a spade when Partner actually holds the K is less likely to lead to a squeeze than is leading a club when Partner actually holds the K.
June 10
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From the vugraph commentary:

Vugraphzfb: Zia [South]: “Just bid 4, I didn't know what you were doing” Cheek [North]: “I didn't know what you were doing - you might have had AK of diamonds”
kit: On actual auction, South was worried about being off the first 2 club tricks.
Vugraphzfb: Cheek: “I”m sorry, I didn't know what was going on - at no time did I know I was getting raised"
fabsayc: if cheek had no club control, would have rebid 4
Vugraphzfb: Zia: “we should actually play 4 by me would be forcing after a positive response”
June 9
David Levin edited this comment June 9
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I especially liked the following insight from page 9:

“The problem is that the grand may depend upon the play as well as the bidding . . . If I misguess and they guess correctly at the other table, that would be even a bigger adverse swing.”
June 9
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