I'm certainly not an expert BBO player. But often I'm confused in reviewing a board when GIB's opening lead is the same for all players, yet its follow-up leads vary for reasons I cannot surmise. Example: In the ACBL Daylong (MP) A -2019-10-10 Board#2. With the bidding the same for all players, S ends up declaring 4H:
- GIB's opening lead in all cases was the D4. E plays its singleton D, and NS wins the trick.
- If NS takes the CA and then lead hearts, W wins the HA and plays a diamond for E to ruff.
- But, when NS next leads hearts (trumps), W wins the HA but returns a club, which lets S make as many as 6H.
Very much will appreciate someone enlightening me as to how GIB decides it second lead after the opening lead.
CarmelBobC
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GIB Leads and Followups Consistency
#2
Posted 2019-October-11, 20:57
The basic logic:
- GIB deals a certain number of hands at random, "consistent" with the bidding and play so far
- for each one, it calculates the best card to play, double dummy
- it then plays the card that has the best average result
If the bidding/play is identical up to that point, the random seed is equivalent and it will deal the same hands, and end with the same result.
If things aren't identical, a different set of random hands would have been dealt, which can give a different result.
- GIB deals a certain number of hands at random, "consistent" with the bidding and play so far
- for each one, it calculates the best card to play, double dummy
- it then plays the card that has the best average result
If the bidding/play is identical up to that point, the random seed is equivalent and it will deal the same hands, and end with the same result.
If things aren't identical, a different set of random hands would have been dealt, which can give a different result.
#3
Posted 2019-October-12, 11:22
carmelbobc, on 2019-October-11, 20:49, said:
- If NS takes the CA and then lead hearts, W wins the HA and plays a diamond for E to ruff.
- But, when NS next leads hearts (trumps), W wins the HA but returns a club, which lets S make as many as 6H.
- But, when NS next leads hearts (trumps), W wins the HA but returns a club, which lets S make as many as 6H.
Gib figures out what to do at the moment, what it played earlier doesn't affect its new decision.
Sarcasm is a state of mind
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