Minitinous Trump Break Playing cintracts
#1
Posted 2019-August-04, 23:58
I have been playing Bridge competitively for over 40 years and I have never experienced this type of trump distribution over such a continuous period of time. Occasionally bad distribution as mentioned above can be a challenge, but the current situation is beciming quite boring t the point of expecting it each time a game in a suit has been bid correctly.
Comments from other players are welcome.
#2
Posted 2019-August-05, 03:01
#3
Posted 2019-August-05, 06:21
#4
Posted 2019-August-05, 09:25
#5
Posted 2019-August-05, 10:11
#6
Posted 2019-August-05, 14:24
#7
Posted 2019-August-05, 16:00
#8
Posted 2019-August-06, 02:58
#9
Posted 2019-August-06, 04:05
I agree in principle with what most people are saying but the issue is far too complex to address on a forum and I'm too tired
Suffice to say I trust that the hands are suitably random, whatever randomness means
#10
Posted 2019-August-06, 04:16
#11
Posted 2019-August-06, 08:59
dsLawsd, on 2019-August-06, 02:58, said:
The only non-random thing we do is swap the hand with the most HCP to South when you play Best Hand robot tourneys.
We also use the Linux rand() function, which is admittedly not the best random number generator. But Hans's analysis didn't find any particular bias due to this.
#12
Posted 2019-August-06, 13:24
Also, swapping the hand violates the Laws of Bridge which states what is required for a bridge hand deal. What should/could be done instead is to Rotate the best hand to South without changing anything else.
The story continues - What deal generator does the ACBL use for Tournament play?
#13
Posted 2019-August-06, 14:10
dsLawsd, on 2019-August-06, 13:24, said:
Good point.
dsLawsd, on 2019-August-06, 13:24, said:
Good question.
#15
Posted 2019-August-07, 08:34
dsLawsd, on 2019-August-06, 13:24, said:
Also, swapping the hand violates the Laws of Bridge which states what is required for a bridge hand deal. What should/could be done instead is to Rotate the best hand to South without changing anything else.
How can you rotate the best hand to South without changing any of the other hands? And what difference does it make how we get the best hand into the South position, it has the same effect on the randomness.
Quote
We use a simple C function we wrote decades ago.
#16
Posted 2019-August-07, 11:33
#17
Posted 2019-August-07, 13:08
barmar, on 2019-August-07, 08:34, said:
We use a simple C function we wrote decades ago.
By elementary logic you can rotate the best hand to South, the other hands rotate too. And this maintains the same random deal whereas the BBO method does not.
And I at least assumed the question about ACBL was related to real world tournaments, not BBO.
Our RA uses Big Deal I think.
#18
Posted 2019-August-07, 14:24
pescetom, on 2019-August-07, 13:08, said:
This can't make a single bit of difference. The probability a given deal occurs is identical whether you rotate or swap.
#19
Posted 2019-August-07, 19:13
less than 2 or 3% of the time that the opening lead is away from a King. Now later on
in the play you get the Bots leading from Kings.
When I play in the club you just learn who leads form Kings and who doesn't There it
is at least 30 or 40% leading from a missing king.
#20
Posted 2019-August-07, 21:15
dsLawsd, on 2019-August-06, 13:24, said:
The story continues - What deal generator does the ACBL use for Tournament play?
The ACBL began using Big Deal for the Winter NABC in 2016. Nicolas Hammond (author of the recent Detecting Cheating in Bridge) proved that feeding a suitable program boards 1, 2, & 3 of an ACBL generated board set would yield boards 4-36 in a short enough time for the result to be useful for cheating on most of the "solved" boards. He also delivered statistics indicating that some pairs might be using this "crack" (or one like it) to cheat at NABCs and Regionals. The ACBL (and EBU, and USBF, and WBF) finished switching to Big Deal by January 2017.
Apparently, most folks with sufficient knowledge of bridge, national bridge organizations, cryptography, mathematics, and statistics (This skill cluster probably requires a team of several folks in most instances.) believe that with suitable communications security Big Deal is not subject to such a "crack."
Brian Potter
e-mail: ClioBridgeGuy >at< att >dot< net
URL: Bridge at the Village
Bridge is more than just a card game. It is a cerebral sport. Bridge teaches you logic, reasoning, quick thinking, patience, concentration, and partnership skills.
- Martina Navratilova