[mlbridge]

barmar, on 2018-December-21, 10:45, said:

Better to use Robot Report or post them in the GIB forum. I doubt that Georgi is looking here for reports.

OTOH, maybe you should bid your hearts instead of splintering in clubs, they're a source of tricks. You also could have opened 1♥, planning to reverse in spades twice to show the 6-5 shape.

I've found that GIB is not great at evaluating its hand after splinters, it frequently signs off when there are slam prospects. I'm not sure if we have lots of bidding rules for this, it might rely more on simulations.

Slam bidding is complicated, it's hard to write explicit rules for them, it usually takes judgement.

Do you by any chance have any info as to how the GIB signals on defense?

[cyrenman]

Group B

cyrenman 57 - 31 Natali_

http://webutil.bridg...yrenman&v3b=app

[hrothgar]

barmar, on 2018-December-21, 10:45, said:

OTOH, maybe you should bid your hearts instead of splintering in clubs, they're a source of tricks.

Single biggest thing that I care about is a Diamond control, followed by the Queen of Spades, so opening spades, seemed like the way to go.
Also, GIB likes to lead shortage, so suppressing the Hearts and getting a Heart lead into my hand tends to pay off.

Quote

You also could have opened 1♥, planning to reverse in spades twice to show the 6-5 shape.

In my experience, GIB handles 6-5s with reverse strength miserably.

[billyjef]

billyjef 25 : 10 sfi
https://webutil.brid...1724&u=billyjef

[mlbridge]

Mlbridge / Toast1 39-30
https://webutil.brid...6184&u=mlbridge

[mlbridge]

Mlbridge / Tim_ucin 45-40

https://webutil.brid...3896&u=mlbridge

[mlbridge]

Mlbridge / Twisterrz 41-38

https://webutil.brid...0079&u=mlbridge

[mlbridge]

Mlbridge / Smerriman 25-25

https://webutil.brid...3914&u=mlbridge

[smerriman]

heart76, on 2018-December-19, 04:24, said:

I do not normally ask this, and no hard feelings irrespective of what you will say, but can the TD take a look at GIB defence on board 14?
The difference between the 2 hands is the first card played from dummy from a doubleton, resulting in a 10 IMP swing which is IMHO totally unfair
Ok, GIB has its limits, but depriving the long spades from a side ace is above and beyond.

I dealt 500 hands which matched these rules:

- North has K93 in spades
- North has either 4 hearts, or 5 hearts and less than 11 total points (didn't bid 2♥ directly)
- North has less than 4 diamonds (wouldn't bid 3NT)
- North has between 11 and 18 HCP (going by definition)

Note North will bid 3NT even with four low hearts, so you can't assume any honors there.

The results:

In 63 cases, partner had the club ace. Leading the spade beats 3NT, while leading the heart Ace allows it to make. Heart Ace costs 10 IMPs.
In 112 cases, we can cash the setting tricks in hearts, gaining either 11 (53 cases) or 12 (59 cases) IMPs.
In 266 cases, cashing the heart saves an overtrick, gaining 1 IMP.
In 50 cases, we can save two overtricks by cashing the heart, gaining 2 IMPs.
In 9 cases, cashing the heart Ace costs an overtrick, losing 1 IMP.

Overall, playing the heart Ace is 2.04 IMPs better than playing a spade.

Based on the frequencies in this simulation, suppose GIB deals 20 hands before leading at trick 3. 8% of the time, the results will say to lead a spade, and 92% of the time the results will say to lead a heart.

So if you're saying the heart lead is a bug; that's clearly not right. If you're saying the spade lead is a bug, well, that will happen 8% of the time (adjust based on the number of deals); that's not a bug, just how simulations work.

If you're saying both tables should have led a heart, then it's plausible that some code could be built in to synchronise the random seeds in this case where the deals have gone back to equal. But this sounds complex, especially when there are probably similar situations where you wouldn't want to.

[Icycookie]

icycookie - diana_eva 34-20
https://webutil.brid...775&u=icycookie

[toast1]

toast1 41-19 smerriman
http://webutil.bridg...269743&u=toast1

[smerriman]

Knew this was going to happen.
https://webutil.brid...289&u=smerriman
smerriman 10 - 31 GIB

[derppp]

derppp 46-8 GIB

http://webutil.bridg...pp&v3b=app#row-

derppp 24-57 xbabarx

http://webutil.bridg...pp&v3b=app#row-

[Wackojack]

https://webutil.brid...991&u=Wackojack

Group B
Wackojack 22 Broze 38

You have

---

2S was given as Michaels. Your next bid as South. There are 17 imps on your decision. Then take a look at B7

[Natali_]

Natali_ 15/ Sep123 37

Shuba 38/ Natali_17

[ye17]

ye17 16-10 heart76
https://webutil.brid...45385266&u=ye17

[Ranmit]

Ranmit - Pio_magic 61 - 10 https://webutil.brid...172548&u=ranmit
Ranmit - Sep123 55-18 https://webutil.brid...315411&u=ranmit
Ranmit - Shuba 15 - 15 https://webutil.brid...366323&u=ranmit
Ranmit - Olegru 25 - 32 https://webutil.brid...378971&u=ranmit
Ranmit - Mkgnao 48-15 https://webutil.brid...406153&u=ranmit

Just out of curiosity, what formula have you used for determining the seeding?

[barmar]

Barmar - Stephen Tu 34 - 16
http://webutil.bridg...aeb4-1545287291

[Ranmit]

Ranmit - GIB 47 - 30 https://webutil.brid...542859&u=ranmit

[Wackojack]

Wackojack 34 Ranmit 31
https://webutil.brid...543&u=Wackojack