Author: Torsten Schoop
Date: 13:28:03 09/06/98
Go up one level in this thread
On September 06, 1998 at 00:27:31, Robert Hyatt wrote:
>On September 05, 1998 at 16:51:49, Thorsten Czub wrote:
>
>>On September 05, 1998 at 08:55:15, Torsten Schoop wrote:
>>
>>>Hi all,
>>>
>>>the winner is: Chess Tiger! Congratulations!
>>
>>I thought this would happen !!
>
>Just for discussion, one key point. The Bucholtz tiebreak score is really
>no good here. Why? Because the initial "seeding" really had no sanity checks
>done, because there was no good way to do them. The reason this tie-break
>works in normal Swiss events is that there is a fairly accurate seeding, based
>on established ratings that are pretty accurate.
>
>In this event, this wasn't done because no ratings are available. To understand
>why this fails, do this: run a swiss where you know the two entries that will
>end up tied for first. But seed one of the 1, and the other at the bottom.
>After they tie, compute their bucholtz score. the higher seed will have the
>higher tiebreak, quite naturally, because when pairing, within a group with
>the same total points, you use seeding as the first ranking...
>
>Were I giving the winner in this event, I would simply list all the programs
>that finished tied. And I'd say this whether Crafty was 1 on tiebreak or
>number 5.
>
>But clearly, here, the tiebreak doesn't do a thing sensible...
You are right. One solution is the "Median Buchholz" which means:
Same as Buchholz but after leaving out the highest and the lowest scoring
opponents. Its idea is to eliminate distortions in Buchholz values caused by
taking into account games against run-away winners and bottom placed players.
Here are the new standings:
Place Name Score M-Buch. Berg.
1-5 Chess Tiger 11.5, 8 60.5 51.75
Crafty 15.18, 8 58.5 47.75
Patzer 2.99zp, 8 56.0 41.75
Comet A95, 8 56.0 41.50
The Crazy Bishop 0038, 8 53.0 41.00
6-7 CM Gideon 3.0 16 MHz, 7 56.0 41.00
Gromit X, 7 51.0 29.50
8 Fortress 1.4a, 6.5 50.0 25.75
9-11 Dr. T, 5.5 49.5 26.50
Diogenes 4.70, 5.5 44.0 16.00
Rabbit32 150898, 5.5 42.0 15.00
12-13 EXchess 2.45d, 5 55.0 21.75
Fidelity Mach 3, 5 47.5 15.75
14-15 Inmichess 1.06, 4 52.0 11.75
Mephisto Rebell 5, 4 47.0 9.50
16 Dabbaba 190898, 2.5 52.0 8.00
17 Cilian 3.56, 1.5 50.5 3.25
18 Nero 3 100898, 0 45.5 0.00
Torsten
>
>
>
>>
>>>Final standings:
>>>
>>>Place Name Score Buch. Berg.
>>> 1-5 Chess Tiger 11.5, 8 73.5 51.75
>>> Crafty 15.18, 8 70.5 47.75
>>
>>I think we can see that crafty and tiger have a good position in YOUR
>>AND in my tournament.
>>This is an important fact.
>>I don't think this is random! It shows that these programs have made progress.
>>I will see if comet can come as close to the top too... the concurrence is very
>>strong, on the other hand...
>>
>>> Comet A95, 8 65.5 41.50
>>>Til next tournament
>>>Torsten
>>
>>From Thorsten to Torsten :
>>thanks for your good work.
>>
>>Any ideas who could win MY tournament ?!
>>Still 5 rounds to go...
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