is this a negative double?

[croquetfan]

I have no idea how to use the hand viewer.

 

I was playing in BBO express #9144 and was surprised by this:

I held 74

AK73

J7

A9852 which I stretched to open 1C p 1D 1S by RHO.

I doubled to show hearts which I guess is an overbid. partner (GIB) took this as penalties 15-17 pts, biddable spades. so it goes p, p and RHO runs to 2H. I pass and LHO corrects to 2S. GIB now X and I pull this to 3C. Partner corrects at last to 3H hooray.

BUT RHO now bids 3S and partner bids 3NT. I know if I correct back to 4H GIB will bid 7NT or something so I pass and watch GIB go down 3 for a 57% score so I guess this must have happened at every table.

[inquiry]

I have no idea how to use the hand viewer.

 

I was playing in BBO express #9144 and was surprised by this:

I held 74

AK73

J7

A9852 which I stretched to open 1C p 1D 1S by RHO.

I doubled to show hearts which I guess is an overbid. partner (GIB) took this as penalties 15-17 pts, biddable spades. so it goes p, p and RHO runs to 2H. I pass and LHO corrects to 2S. GIB now X and I pull this to 3C. Partner corrects at last to 3H hooray.

BUT RHO now bids 3S and partner bids 3NT. I know if I correct back to 4H GIB will bid 7NT or something so I pass and watch GIB go down 3 for a 57% score so I guess this must have happened at every table.

 

Not entirely sure why you got above 50% for this auction, unless 4♠ makes for them (sounds like your LHO has a singleton or void in hearts, so some of your heart values are wasted on defense). I am thinking with a minimum hand, no support for diamonds, pass with your hand over 1♠ is correct call. This would seem the correct bid EVEN IF double shows hearts. After all, you are minimum, and presumably if partner has hearts (and diamonds) he will have modest values (else hearts first). Not sure if robots bid up the line with weak hands, however (don't play with much). But with my normal partners, if partner has 4 hearts, he has GI type values here or better, and with some, GF values.

 

BTW, this seems to be a flaw in the gib bidding logic here. If you were willing to pass out 2H, and tried to correct to 3H only, GIB should not be able to now bid 3NT. Likewise, the bidding logic should (I know it doesn't) keep him from doing something stupid if you bid 4H. I suspect 4♥ would be doubled by yoru RHO GIB who surely has at least 4♥ on this auction for is 2♥ bid.

[Bbradley62]

[hv=myhand=M-7258561-1299473701]360|270[/hv]

You got a good score because the most common result was 4♠ by South, doubled and making. Funny that your South ran from 1♠x.

[Bbradley62]

<<retract>>

[manudude03]

A negative double is generally done by responder, not opener. There was a thread on it here. I must admit the robots play some very strange doubles at times. Also the way the robot played that looks really weird.

[ahydra]

Interesting GIB takes a double in the situation

 

1x - (any) - 1y - (1 or 2z) - X

 

as "penalties" with biddable z. Doesn't it show a good hand with a takeout-type shape, short in z, in standard bidding? Certainly in a weak no trump system this is how you bid strong no trump hands without a stop in z.

 

ahydra

[helene_t]

GIB plays support doubles but apparently only for majors. When support doubles don't apply, the default meaning of double is penalties. In the GIB system, it is. Of course it makes little sense to play double by opener as penalty, except in some situations where responder has bid 1NT rather than a suit.