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Subject: Re: SoBerg ?? - What is it?

Author: Ricardo Gibert

Date: 10:03:44 08/15/03

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On August 15, 2003 at 12:35:04, Jarkko Pesonen wrote:

>Brutus is doing fine in this Abit AG Open – Lippstadt
>Can someone explain what the SoBerg value is and how it calculated?
>I got the impression that it can be decisive in the tie-break situation.

To break ties, the Sonneborn-Berger method was used, where each 'tied'
player scores his "SB points" by adding as follows:

A = 100% of his opponent's points if he won the individual game,
B = 50%  of his opponent's points if he drew the individual game,
C = 0%   of his opponent's points if he lost the individual game.

The "Sonneborn-Berger" value is A+B+C

We take an example from the crosstable below. Maiwald and Cyborowski are tied
for 2nd and 3rd with 14 points. To compute Maiwald's SB points we first add the
scores of the opponents he beat: A = 10 + 9 + 4 = 23, then we add 50% of the
scores of the opponents he drew: B = (14 + 12 + 11 + 9 + 3)*½ = 24½ and 0% of
the opponent scores he lost to is always C = 0 irrespective of the number of
losses. Now A + B + C = 23 + 24½ + 0 = 47½. By similar calculation, Cyborowski
has 46½ SB points, so Maiwald wins on tiebreaks.

>
>Rangliste: Stand nach der 8. Runde
>
>Nr.   Teilnehmer   TWZ      1  2  3  4  5  6  7  8  9 10 11 12 Punkte SoBerg
>1. Brutus,Computerpr        **    ½  ½  1  1  ½  1     1     1 18.0   57.50
>2. Maiwald,Jens-Uwe   2517    **  ½  ½  ½  1  ½  1        1  ½ 14.0   47.50
>3. Cyborowski, Lukas  2550  ½  ½ **     ½     ½  ½  1     1  1 14.0   46.50
>4. Ruck, Robert       2550  ½  ½    **     ½  ½     ½  1  1  ½ 12.0   42.50
>5. Chiburdanidze, Ma  2497  0  ½  ½    **     ½  ½  1  ½  1    11.0   39.50
>6. Smeets, Jan        2477  0  0     ½    **     ½  ½  ½  1  1 10.0   25.50
>7. Gustafsson,Jan     2570  ½  ½  ½  ½  ½    **  0  1  ½        9.0   47.00
>8. Jenni,Florian      2508  0  0  ½     ½  ½  1 **        0  1  9.0   29.50
>9. Schenk,Andreas     2491        0  ½  0  ½  0    **  1  1  ½  9.0   23.50
>10.Wehmeier,Stefan    2350  0        0  ½  ½  ½     0 **  ½  1  7.0   20.00
>11.Brenke,Andreas,Dr  2404     0  0  0  0  0     1  0  ½ **     4.0   12.50
>12.Romanishin, Oleg   2561  0  ½  0  ½     0     0  ½  0    **  3.0   17.50

• Re: SoBerg ?? - What is it? Jarkko Pesonen 10:52:42 08/15/03
  • Re: SoBerg ?? - What is it? Ricardo Gibert 11:16:41 08/15/03

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