pescetom Posted February 6, 2022 Report Share Posted February 6, 2022 So you get 12 Can anyone explain what happens at trick 11? Quote Link to comment Share on other sites More sharing options...
smerriman Posted February 7, 2022 Report Share Posted February 7, 2022 Anyone? Yes. But the only people that can don't :( Can try to invent an explanation, like it rules out West having the ♥K from the lead, thus double dummy says both a diamond and a club are +1 until half a trick later when suddenly it isn't, but Advanced GIB is programmed to avoid that type of logic, and we've already seen other cases where GIB chooses a card that is strictly worse than another card in every possible arrangement of cards. Quote Link to comment Share on other sites More sharing options...
sfi Posted February 7, 2022 Report Share Posted February 7, 2022 My first thought is "bid better" ;). But then I wondered what would happen if South had bid 7NT instead. Does anyone have the tools to test that? Quote Link to comment Share on other sites More sharing options...
johnu Posted February 7, 2022 Report Share Posted February 7, 2022 At trick 11, double dummy, 13 tricks are guaranteed by leading a diamond. If West has ♦Q, finesse. If East has ♦Q then it is doubleton since East is known to have ♥K. So declarer leads a diamond, West follows low, and now??? Panic!!! Should have cashed good club, oh no!?! Odds are 4 to 3 that East has ♦Q, so play for the drop. Quote Link to comment Share on other sites More sharing options...
pescetom Posted February 7, 2022 Author Report Share Posted February 7, 2022 At trick 11, double dummy, 13 tricks are guaranteed by leading a diamond. If West has ♦Q, finesse. If East has ♦Q then it is doubleton since East is known to have ♥K. So declarer leads a diamond, West follows low, and now??? Panic!!! Should have cashed good club, oh no!?! Odds are 4 to 3 that East has ♦Q, so play for the drop.Ok, but surely ♣T will also show 13 tricks double dummy. Is there is no single dummy override, even with just 3 tricks remaining? It would only be a few lines of code if based entirely on top tricks (which would be sufficient here), a few pages if you want it to unblock and pull suit (I seem to remember reading that there is already something similar in the claim evaluation mechanism). Quote Link to comment Share on other sites More sharing options...
smerriman Posted February 7, 2022 Report Share Posted February 7, 2022 The GIBson algorithm kicks in after the first 2 tricks (or maybe it's 3; definitely less than 10) for the advanced robots so as mentioned earlier that's not really a valid explanation. Quote Link to comment Share on other sites More sharing options...
pilowsky Posted February 7, 2022 Report Share Posted February 7, 2022 On a side note, robots sometimes replace humans mid-hand.Does the replacement GIB get to peek at the played tricks or do they suffer the same disadvantage as human subs? Quote Link to comment Share on other sites More sharing options...
pescetom Posted February 7, 2022 Author Report Share Posted February 7, 2022 My first thought is "bid better" ;)I was tempted to do so but managed to resist ;) Partner is a robot and it's a MP tournament on BBO, after all: 6NT+1 would have been 92% and even 6NT= was 52%, to give you an idea. With a human I would bid 3♣ over 2NT, expecting that to be game forcing and to elict 3♠ showing 3-card support: after that I could bid to 7NT in various ways with my regular partner, or use RKCB and vanilla Specific Kings to 7♠ with anyone else. But I've not tried bidding constructively with robot after a 2NT jump and I wasn't in a hurry to experiment - my impression based on previous traumatic experiences is that robot is not interested in responder's major and is likely to get over-excited during slam investigation too. Quote Link to comment Share on other sites More sharing options...
pescetom Posted February 7, 2022 Author Report Share Posted February 7, 2022 On a side note, robots sometimes replace humans mid-hand.Does the replacement GIB get to peek at the played tricks or do they suffer the same disadvantage as human subs? It's a good question, but I imagine the answer is that they get to peek, as this saves writing extra code. Quote Link to comment Share on other sites More sharing options...
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