WBEC Ridderkerk new results.

[Leo Dijksman]

Geschrieben von: / Posted by: Leo Dijksman at 17 January 2004 17:02:58:

New results Premier division:

Round 15:
WBNimzo 2000b ½1½½ 2.5/4
Nejmet 3.07 ½0½½ 1.5/4
------------------------------------
Round 16:
DeepSjeng 1.5 111½ 3.5/4
Gromit 3.82 000½ 0.5/4
------------------------------------
Crafty 19.06 11½½ 3.0/4
Rebel 12 00½½ 1.0/4
------------------------------------
Ruffian 2.0.0 - Yace Paderborn 1/2-1/2 = 3 games to go!
------------------------------------

Next matches:
Round 16:
Dragon 4.5 - Gandalf 4.32h
LittleGoliath 3.9po - Pharaon 2.62
GreenLightChess 3.00 - Aristarch 4.21
The King 3.23 - WARP 0.58
WBNimzo 2000b - SmarThink 0.17a
Nejmet 3.07 - Zarkov 4.5e

New results 2nd Division:

Round 16:
Ktulu 4.1 ½11½ 3.0/4
Resp 0.19 ½00½ 1.0/4
------------------------------------
King Of Kings 2.52 1111 4.0/4 !!
Queen 2.42 0000 0.0/4
------------------------------------
Amateur 2.70 ½011 2.5/4
Butcher 1.42c ½100 1.5/4
------------------------------------
XiniX 2.9.11 - Knightx 1.80a 1-0 = 3 games to go!
------------------------------------

Next matches:
Round 17: (last round!)
The Baron 1.1 b3 - Knightx 1.80a
Esc 1.16 - Amy 0.8.3po
Movei 0.08.131 - Horizon 4.1
Chezzz 1.0.3 - The CrazyBishop 0.04.5
List 4.61 - Hagrid 0.7.56
SlowChess 2.89b - Resp 0.19
King Of Kings 2.52 - Ktulu 4.1
Queen 2.42 - Amateur 2.70
Butcher 1.42c - XiniX 2.9.11

Promo E tourney:
Round 1:
First results tomorrow!
------------------------------------


Crosstables and pgn on the WBEC homepage.
Enginelist, latest updates/new engines:
17/01/2003:
Updated: Eeyore v1.15
Leo.


WBEC Ridderkerk homepage.

[Norm Pollock]

Geschrieben von: / Posted by: Norm Pollock at 18 January 2004 02:45:04:
Als Antwort auf: / In reply to: WBEC Ridderkerk new results. geschrieben von: / posted by: Leo Dijksman at 17 January 2004 17:02:58:

I noticed Leo used "S-B" to settle tie-breakers in the promotion tournaments. Could someone explain what that statistic represents?

[Thomas Mayer]

Geschrieben von: / Posted by: Thomas Mayer at 18 January 2004 03:42:33:
Als Antwort auf: / In reply to: What is S-B? geschrieben von: / posted by: Norm Pollock at 18 January 2004 02:45:04:

Hi,

I noticed Leo used "S-B" to settle tie-breakers in the promotion
tournaments. Could someone explain what that statistic represents?

You may know Buchholz - in Buchholz all the points of your opponents are added. For round-robin-tourneys this makes no sense - when two participants have same score then the sum of their opponents would be also the same.
S-B is called "Sonneborn und Berger" (IIRC) - the difference is, that you get only points according to your result against the opponent. So let's say you won against a guy that has 5 points you will get full 5 points for your S-B score. If you only draw you will get 2.5 points. This takes more care about your results against the opponents and therefor is a good system to decide about places in round-robin tourneys when achieved score is equal.
I hope this was correct and understandable.
Greets, Thomas
P.S.: Nowadays even swiss-tourneys are scored by S-B instead of the old Buchholz. This CAN make sometimes a difference. (I think there was at least one CCT where the winner would have been different when they had chosen Buchholz instead of S-B.

[Leo Dijksman]

Geschrieben von: / Posted by: Leo Dijksman at 18 January 2004 08:17:04:
Als Antwort auf: / In reply to: Re: What is S-B? geschrieben von: / posted by: Thomas Mayer at 18 January 2004 03:42:33:

Hi,

I noticed Leo used "S-B" to settle tie-breakers in the promotion
tournaments. Could someone explain what that statistic represents?

You may know Buchholz - in Buchholz all the points of your opponents are added. For round-robin-tourneys this makes no sense - when two participants have same score then the sum of their opponents would be also the same.
S-B is called "Sonneborn und Berger" (IIRC) - the difference is, that you get only points according to your result against the opponent. So let's say you won against a guy that has 5 points you will get full 5 points for your S-B score. If you only draw you will get 2.5 points. This takes more care about your results against the opponents and therefor is a good system to decide about places in round-robin tourneys when achieved score is equal.
I hope this was correct and understandable.
Greets, Thomas
P.S.: Nowadays even swiss-tourneys are scored by S-B instead of the old Buchholz. This CAN make sometimes a difference. (I think there was at least one CCT where the winner would have been different when they had chosen Buchholz instead of S-B.

Hi Thomas,
You are right ofcourse
Only in my case for a draw the full points are counted and for a win the double, this means 5 (S-B) points for a draw and 10 (S-B) points for a win in your example which makes no difference except the total "S-B" score is 2x the "normal" score.
The only reason "I" use this is that SCID works this way )
Best wishes,
Leo.



WBEC Ridderkerk homepage.

[Norm Pollock]

Geschrieben von: / Posted by: Norm Pollock at 18 January 2004 16:20:06:
Als Antwort auf: / In reply to: Re: What is S-B? geschrieben von: / posted by: Leo Dijksman at 18 January 2004 08:17:04:

From the above and from
http://senseis.xmp.net/?SonnebornBerger
this is my understanding:
There is a primary number (1.0 for a win, 0.5 for a draw) and there is the S-B number to be used in case the primary numbers are equal.
The S-B number is calculated as follows:
The sum of 1.0*(primary number of each opponent that you defeated) + 0.5*(the primary number of each opponent that you drew).
Suppose A had a record of 01 against B, == against C and 11 against D, for a primary total of 4 points.
A's SB number would be 1*(B's primary) + 2 * 0.5 * (C's primary) and 2 * (D's primary).
What it amounts to is that a win (or draw) over a high finisher in primary points is worth more that a win (or draw) over a low finisher in primary points.

[Leo Dijksman]

Geschrieben von: / Posted by: Leo Dijksman at 18 January 2004 17:13:42:
Als Antwort auf: / In reply to: Re: What is S-B? geschrieben von: / posted by: Norm Pollock at 18 January 2004 16:20:06:

From the above and from
http://senseis.xmp.net/?SonnebornBerger
this is my understanding:
There is a primary number (1.0 for a win, 0.5 for a draw) and there is the S-B number to be used in case the primary numbers are equal.
The S-B number is calculated as follows:
The sum of 1.0*(primary number of each opponent that you defeated) + 0.5*(the primary number of each opponent that you drew).
Suppose A had a record of 01 against B, == against C and 11 against D, for a primary total of 4 points.
A's SB number would be 1*(B's primary) + 2 * 0.5 * (C's primary) and 2 * (D's primary).
What it amounts to is that a win (or draw) over a high finisher in primary points is worth more that a win (or draw) over a low finisher in primary points.

Yes, in other words:
===========================================================================
Sonneborn-Berger (Partial Score Method)
Add the final scores of all the opponents the players defeated and
half the final scores of all the opponents with whom the player drew.
Nothing is added for the games the player lost or for unplayed games. This
is the most common method used for round-robin events.
===========================================================================
Yes.
Leo.


WBEC Ridderkerk homepage.