GIBs

[mohitz]

Playing Robot Duplicate Matchpoints,

 

[hv=d=s&v=e&n=st9xhxxxdqcj9xxxx&w=sxxhxxxdxxxxcakqx&e=sakqjxxxhtxdtxxcx&s=sxhakqjxdakjxxctx]399|300|Scoring: MP[/hv]

 

The auction

 

1♥ - (p) - p - (2♠)

3♦ - (3♥) - p - (4♠)

5♦ - p - 5♥ - (5♠)

X ///

 

I lead the Ace of diamond. Continue with King of diamond. GIB partner ruffs and returns a club. wtf?

 

PS: Comments on the auction not welcome :(

 

Next board,

 

p - (p) - 1♦ - (1♠)

X - (2♠) - p - p

?

 

GIB bids 3♣ holding xxx KJ9xx xx KJx. wtf2?

[helene_t]

The first one: You showed 7-5 reds ( :) ) so the only way to set the contract is by defending as GIB did. OK maybe I am exaggerating but I think it's plausible that some of its simulations give you a void clubs.

 

Next one: 3♣ apparently was the contract that gave the highest average score in it's simulations. Maybe that is atypical but not shocking.

[junyi_zhu]

Playing Robot Duplicate Matchpoints,

 

[hv=d=s&v=e&n=st9xhxxxdqcj9xxxx&w=sxxhxxxdxxxxcakqx&e=sakqjxxxhtxdtxxcx&s=sxhakqjxdakjxxctx]399|300|Scoring: MP[/hv]

 

The auction

 

1♥ - (p) - p - (2♠)

3♦ - (3♥) - p - (4♠)

5♦ - p - 5♥ - (5♠)

X ///

 

I lead the Ace of diamond. Continue with King of diamond. GIB partner ruffs and returns a club. wtf?

 

PS: Comments on the auction not welcome B)

 

Next board,

 

p - (p) - 1♦ - (1♠)

X - (2♠) - p - p

?

 

GIB bids 3♣ holding xxx KJ9xx xx KJx. wtf2?

The first one: this is normal, in Gib's convention, it thinks that your 5D shows 6 diamonds, so gib takes you for 2-5-6-0 shape and gives you a ruff.

So basically, if you decide to bid 5D, you may need to bid again to take control. Of course it's horrible bridge.

The second one: I just avoid take out doubles. Gib just can't make right bids over partner's takeout doubles. It randomly generates hands, sometimes pass with xxx, sometimes, pulls the double to a 3 card suit with a longer suit of 4 or 5 cards and sometimes, pulls the double when holding 6 cards in opp's suit.

Basically, the bidding of gib is still very badly designed, it doesn't understand the advantage to play in the longest combined trump suit, and it doesn't like declaring NT and thinks NT needs more HCP. Also, it doesn't follow the convention, I have seen gib jumpshift then rebid to show a "solid" suit with something like AKxxx for quite a few times. Also, gib often jumprebids a suit with 5 in the suit and sometimes a 5 card side suit. That's why you see gib often make impossible bids.

 

The key problem of gib bidding is that there are way too many conventions in the system, and most conventions are badly programmed. Another problem is that gib just doesn't play any kind of penalty doubles, all the doubles in gib's system are takeout oriented and it would usually pull your double. The performance of gib's bidding would be greatly improved if it only plays take-out doubles at one and two levels, and penalty doubles at higher levels, which also simplifies the bidding system a lot.