I made an error below Here: For example if there are 3 players with 4 points you include the top rated player with 2 1/2 points. (Or 2 points if there are no draws.)
It should say: For example if there are 3 players with 4 points, you include the top rated player with 3 1/2 points. In go without fractional komi it would be the the top rated player with 4 points. This gives you 4 players in the 4 point scoring group. So player 1 plays 3, and 2 play 4. Don On Mon, May 9, 2011 at 7:32 AM, Don Dailey <[email protected]> wrote: > > > On Mon, May 9, 2011 at 6:09 AM, Nick Wedd <[email protected]> wrote: > >> In message <[email protected]>, Ingo Althöfer < >> [email protected]> writes >> >> One comment added: >>> >>> In swiss tournaments, proper pairing for the first >>> round is the more important the larger the number >>> of players relative to the number of rounds. >>> >> >> Suppose there are ten players, numbered from 1 to 10 in order of strength. >> Is the "proper" round-one pairing >> 1 v 6, 2 v 7, 3 v 8, 4 v 9, 5 v 10 >> or >> 1 v 10, 2 v 9, 3 v 8, 4 v 7, 5 v 6? >> > > The proper pairing is top half vs bottom half starting with best player in > top half vs best player in bottom half. That means your first example is > correct. > > When pairing later rounds, you follow the same pattern. If there are 8 > players with 4 points after 4 round, you rank them in order of strength and > pair the best against the one in the middle, the second best against the > second best in the bottom half, etc. > > Where there are an odd number of players in some "scoring group" you are > supposed to promote the top rated player in the next scoring group to get an > even number. For example if there are 3 players with 4 points you include > the top rated player with 2 1/2 points. (Or 2 points if there are no > draws.) > > There are rules that deal with not playing the same color too many time and > you are not supposed to play the same player twice in a tournament. In > general you are can make small adjustments in the ordering if otherwise some > player is playing the same player twice or is playing the same color too > often. > > If you are one of the top rated players you should easily win your first > few games but it's supposed to get more and more difficult as > the tournament progresses. The idea is that after a few rounds every > player has found his level - the stronger players will generally have > perfect scores but now it gets tough for them. The weaker players have > lost a lot of games but now they are playing other losers. With improper > pairings the strong players have knocked each other out, weak players may > have excellent scores because they never had to play the good players and > you get serious mismatches. The mis-matches should occur in early > rounds, not late rounds. In theory, the largest mismatches should occur > in the first round and even that is limited to half the field. The top > player should never have to play a player weaker than the middle players. > Of course that can change but only if there are upsets. But even if the > weakest player keeps winning, it's not likely he will play the strongest > player unless of course he KEEPS winning to the end (or close to it) or the > strongest players is losing. > > Don > > > > >> I ask only out of curiosity, and in case I some day do the draw for a >> non-KGS Swiss tournament. For KGS tournaments, it is irrelevant, as I have >> no control over the KGS scheduler, which I think does the first-round draw >> at random. >> >> Nick >> >> >> >>> (Typical case: number of rounds = c * log(number of players), >>> where c is a constant larger than 1, and log is meant for base 2.) >>> >>> In the KGS tournament, there were 12 rounds for >>> 12 participants, so pairing for round 1 was not >>> really crucial. >>> >>> Ingo. >>> >>> >>> >>> -------- Original-Nachricht -------- >>> >>>> Datum: Sun, 8 May 2011 15:02:28 -0400 >>>> Von: Don Dailey <[email protected]> >>>> An: [email protected] >>>> Betreff: Re: [Computer-go] May KGS bot tournament: 19x19, fast >>>> >>> >>> In swiss tournaments or knockout tournaments it's important to rank the >>>> players to the best of your ability before doing the pairings. ... >>>> >>> >> -- >> Nick Wedd [email protected] >> _______________________________________________ >> Computer-go mailing list >> [email protected] >> http://dvandva.org/cgi-bin/mailman/listinfo/computer-go >> > >
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