[lycier]

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3♠ was overbid actually,down 5 tricks.but the GIB don't think so,we lost a good chance.
No way to make penalty double for opp's overbid.

[helene_t]

The problem is that your double is not a penalty double. You would double with for example xx-KQJx-AJxx-Kxx. With the hand given it is better to bid 3NT.

GIB's choice of 4♥ is weird, though, especially given that it is described as showing 4♥. I can sympatize with GIB finding that 4♥ has the best EV in simulations, but bidding 4♣ would lead to a 4♥ contract on some of those hand on which 4♥ is right.

Probably it would be best if GIB weeded out "incorrect" calls before performing the sims. Here, pass, 4♣, 5♣, 6♣ and 7♣ should be the only correct calls to consider.

Edit: thanks cloa and antrax, I stand corrected. I suppose that South's double then transfers captainship so that North just simulates its way to the best spot.

[cloa513]

helene_t, on 2013-December-13, 03:26, said:

The problem is that your double is not a penalty double. You would double with for example xx-KQJx-AJxx-Kxx. With the hand given it is better to bid 3NT.

GIB's choice of 4♥ is weird, though, especially given that it is described as showing 4♥. I can sympatize with GIB finding that 4♥ has the best EV in simulations, but bidding 4♣ would lead to a 4♥ contract on some of those hand on which 4♥ is right.

Probably it would be best if GIB weeded out "incorrect" calls before performing the sims. Here, pass, 4♣, 5♣, 6♣ and 7♣ should be the only correct calls to consider.

The second double says biddable spades- its not a penalty double double than nothing is.

[Antrax]

helene, in GIB's weird system the second double actually shows a desire to penalize and 4+ spades.