[hbcgrahamw]

Hi,

when you play a hand in the Casual Bridge section, I get that the scoring shows how you did against others who have played that same board, but from where and over what time period ?

i.e Is score compared against others who have played that board in any section of BBO, or just the Casual section, and is it others who have played that board in the last 24 hours or what?

Can anybody advise please.

[paulg]

Each board on BBO is played a maximum of 16 times. This is rarely as long as 24 hours and ten minutes is more likely.

I expect that the board comparisons will be constrained to the service/bridge club that you are playing in. For example, Casual/Main Bridge Club and Casual/Relaxed will not play the same boards.

[Tramticket]

 paulg, on 2020-May-14, 00:48, said:

I expect that the board comparisons will be constrained to the service/bridge club that you are playing in. For example, Casual/Main Bridge Club and Casual/Relaxed will not play the same boards.

I'm not sure that this is correct? If you play boards in the Acol club for example, it is clear from viewing comparisons that few of the comparisons, if any, will be using Acol.

[paulg]

 Tramticket, on 2020-May-14, 02:09, said:

I'm not sure that this is correct? If you play boards in the Acol club for example, it is clear from viewing comparisons that few of the comparisons, if any, will be using Acol.

I'm not certain myself, although I thought it was true for the Main Bridge Club and Relaxed Bridge Club. Other public and private clubs are a mystery to me.

[StevenG]

 paulg, on 2020-May-14, 02:54, said:

I'm not certain myself, although I thought it was true for the Main Bridge Club and Relaxed Bridge Club. Other public and private clubs are a mystery to me.

Acol Club boards have always been scored against non-Acol Club tables. In the current situation, there are now two Acol clubs - an HTLM/Acol club and a Flash/Acol club. I don't know if the boards will potentially be scored against each other.

[pilowsky]

 paulg, on 2020-May-14, 00:48, said:

Each board on BBO is played a maximum of 16 times. This is rarely as long as 24 hours and ten minutes is more likely.

I expect that the board comparisons will be constrained to the service/bridge club that you are playing in. For example, Casual/Main Bridge Club and Casual/Relaxed will not play the same boards.

Can someone verify this information, please? It seems to be true when I play hands in the prime area. It would be great if hands were confined to the same area of bbo and the same scoring approach where possible.

[smerriman]

If you are playing against robots, you always seem to be compared with other people playing against robots. But prime definitely isn't separated; I know for certain when playing in the MBC I'm compared against others playing in prime (since occasionally I see tables where the robot made a different bid, figured it was due to them having an advanced bot vs my basic, and clicked on the username of the person playing to see they're online and in the prime club).

[pilowsky]

Thank you - that's very helpful. I have noticed that very clearly when playing a hand that results in the same contract for NS that players with a prime badge will get one type of lead whereas players without will get another. This was a little annoying until I got hold of the Bo Haglund double-dummy App for Chrome. Now at least I can find out what makeable contracts were available and what the optimal outcome was. As for total numbers, I don't think that 16 is enough to fully parameterise a normal distribution. At least 24 would be needed to avoid type I/II errors. I can understand why in Daylong tournaments we do not all play the same boards to prevent cheating, but by the same token, an individual player needs to aim for a large tournament so that each hand is played a sufficient number of times to avoid sampling error in the outcome.