[Bbradley62]

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7 Norths played 3N, after 2 different auctions:
1) 1S-1N-3S-3N (at 2 tables, including mine)
2) 1S-1N-2S-2N-3N (at 5 tables)

The first four tricks were the same at all tables. On trick 5, the two declarers whose partners had jumped led ♥J; the five declarers whose partners had not jumped continued to attacked clubs. Why the difference?

[phil_20686]

I dont really know anything about the GIB engine, but when it sims hands does it exclude hands where it would have bid differently? I.e. is it possible that there are some hands that would bid in one auction but not the other, and excluding them changes the odds?

Its all I can think off. Except a random abberation

[Vampyr]

phil_20686, on 2011-February-24, 10:11, said:

I dont really know anything about the GIB engine, but when it sims hands does it exclude hands where it would have bid differently? I.e. is it possible that there are some hands that would bid in one auction but not the other, and excluding them changes the odds?

Yes, it must have something to do with the non-jump auctions giving E/W more chances to enter the auction, so GIB might be excluding some extremely shapely hands, which turn out to be enough to tip the balance.