Mark Brader:
"M C Hamster":
>>> That is cool. It would be fun to be a bridge tournament director,
>>> wreaking mayhem on rubbers left and right.
"bill van":
>> Sorry, but rubber bridge is never played at tournaments. There is no way
>> to compare players' scores in rubber bridge because each deal is played
>> only once. Tournaments, everything from the four-times-a-week event at
>> our local community centre to world teams championships, always employ
>> duplicate bridge, in which everyone plays the same hands.
"M C Hamster":
Yes, rubber bridge tournaments exist; they're just outside of the world
that most tournament bridge players exist in.
> They may not be govered by the World Bridge Association's
(Federation, actually.)
> laws, agreed.
Well, they're not governed by the duplicate bridge laws, which are what
I quoted. There's a separate set of laws for rubber bridge, which,
notably, do not require a director to exist.
> When some small local organization does a duplicate bridge tournament,
> how do they do that logistically? If there are, say, 12 tables of
> teams competing, and, er, let's just say 10 deals which comprise the
> small tournament,
A deal is called a "board", for reasons which will be obvious in a
few sentences. 10 boards is too short for a reasonable match.
With 12 tables you will usually play either play 24 boards, 2 each
against 12 of the other pairs, or 27 boards, 3 each against 9 of the
other pairs.
> that's 120 decks
Actually 24 or 27 decks.
> which would need to have the cards separated.
See below.
> Or is what happens is that the decks are kept separated during the
> playing of a hand,
Exactly. As each person plays a card they leave it in front of them,
not in the middle of the table.
> and those are then passed on to the next team?
Exactly. A holder called a duplicate board is used; it has 4 slots,
one for each hand of 13 cards. Hence "board".
http://i01.i.aliimg.com/img/pb/300/831/287/287831300_728.jpg
In practice the cards are stored in the boards between game. A bridge
club will have several sets of boards (depending on how large their
game is), typically 36 boards in a set, with one deck of cards in each
one. Organizations running big tournaments have lots of boards.
> (Or do the teams just move from table to table and the cards stay
> at the table?) I guess that must be what happens.
This format is also possible, but not usual.
> Are the teams two-person teams only?
The most common type of duplicate bridge is "pairs", where the answer
is yes.
> Or are there 4 people on a "team"?
This form of play is also possible, and is what is meant by "teams".
There are also "individual" events, where you play with a succession
of partners as well as against a succession of opponents. They aren't
common here and I've never played in one, or wanted to.
> If only two-person teams, then I don't quite understand how
> you can compare those who play North-South at one table against
> players who played East-West at that same table.
There are several ways of arranging and scoring pairs game. The
simplest, the basic Mitchell movement, is a "two-winner" movement:
it produces a North-South winner and a separate East-West winner
(and a N-S second place and E-W second place, and so on for as
many positions as they choose to recognize).
However, if the N-S winner gets 63% of the total number of possible
matchpoints (comparison points) available, and the E-W winner gets
65%, then in some events the E-W winner will be declared the
overall winner.
A fairer comparison involves having pairs play E-W some of the time
and N-S some of the time, but I don't have time to go into that now.
> I do understand the
> scores are compared to others who played the same hands, but if, say,
> playing the North-South hand is "trickier", and the East-West hand is
> pretty much a "no brainer", then those playing East-West have less
> opportunity to distinguish themselves from their opponents.
There's no distinction as to whether you got a good score on any
particular board because you were brilliant or because your opponents
were stupid, or because you had the "no brainer" side and your
opponents got it wrong, or because you had the "tricky" side and
nevertheless got it right. This stuff averages out from one board
to another.
> If there are 4 person teams, then you could force your team to play
> both the North-South and East-West hands, equalizing everything.
Actually, what really equalizes things at teams is that if N-S of
team 1 and E-W of team 2 play a particular deal, then when E-W of
team 1 play that same board, *they play against N-S of team 2*.
So there is a direct comparison. This isn't true at pairs.
> Of course in this case I would try to cheat and let my teammates who
> are going to play that table what to expect. I suppose that sort of
> thing is frowned on.
Hell yeah!
Now as to "needing the cards separated": There are three common ways
that the hands get prepared into deals before play. The simplest way
is that before the first round of the game, the players take the cards
in their boards, shuffle, and deal them out. The downside of this is
that even today there are still too many players who don't shuffle
enough times. (The recommended number is 7 riffle shuffles.)
Another way is that a computer prepares the deals using a pseudo-random
number generator, and a dealing machine (using OCR, or sometimes a
bar-code on each card) identifies the cards and deals them into four
stacks representing the hands:
http://www.bridgeguys.com/graphics/Duplimate.jpg
The in-between way is that the pseudo-random deals are printed on paper
and a few of them are handed to the players, who set up the decks
appropriately. Typically one player takes all the clubs and then
hands them out to the other players as indicated, and similarly for
the other suits. It only takes a couple of minutes to prepare a board.
The movement must then be arranged so that neither the N-S pair nor the
E-W pair will play this board.
In either case where a computer prepares the deals, a record of all
the hands is made available out to the players after the session, so
they can discuss to their heart's content whether they should have
played board 27 in a contract of 4 spades or 3 no trump.
You might like to read
http://www.pagat.com/boston/bridge.html
for a general introduction to the procedures of bridge, including
the two major types of duplicate and other variations.
--
Mark Brader "By this time I was feeling guilty. No, correction,
Toronto I was feeling that I *should* feel guilty ..."
m...@vex.net -- Jude Devereaux