Formulas

We assume that the tournament has n solvers, with ratings ${\displaystyle R_{i}}$ (i = 1, ..., n) and in the tournament their scores are ${\displaystyle S_{i}}$ (i = 1, ..., n).

• AveRat = average rating of the solvers
• AveSco = average score of the solvers
• VarRat = ${\displaystyle {\frac {1}{n}}\sum _{i=1}^{n}(R_{i}-{\mbox{AveRat}})^{2}}$
• Covar = covariance between ratings and scores = ${\displaystyle ({\frac {1}{n}}\sum _{i=1}^{n}R_{i}S_{i})-{\mbox{AveRat}}\cdot {\mbox{AveSco}}}$
• Slope = ${\displaystyle {\frac {\mbox{Covar}}{\mbox{VarRat}}}}$
• Intercept = ${\displaystyle {\mbox{AveSco}}-{\mbox{Slope}}\cdot {\mbox{AveRat}}}$

For players who didn't already have a rating, a preliminary rating is calculated. This rating is determined at the end of the first tournament in which the solver has participated. The formula that is used to calculate this rating is:

• preliminary rating = ${\displaystyle {\frac {{\mbox{Score of player}}-{\mbox{Intercept}}}{\mbox{Slope}}}}$

For players who already have a rating, the new rating is calculated as follows.

• Rat = most recent rating of the solver
• ExpSco = ${\displaystyle {\mbox{Slope}}\cdot {\mbox{Rat}}+{\mbox{Intercept}}}$
• TC = tournament coefficient, a number between 1 and 4; when the tournament is stronger, the TC is higher
• ChangeRat = ${\displaystyle {\mbox{TC}}\cdot ({\mbox{Score of player}}-{\mbox{ExpScore}})}$
• NewRat = new rating = ${\displaystyle {\mbox{Rat}}+{\mbox{ChangeRat}}}$

These formulas are the defaults. If parameters fall outside a predetermined range, correction calculations are being carried out. These can be found in the reference.

Rating list in 2015

October 1st 2015, Top 10:^[1]

1. GM Georgy Evseev (Russia) 2785
2. GM Kacper Piorun (Poland) 2744
3. GM Piotr Murdzia (Poland) 2742
4. GM John Nunn (United Kingdom) 2716
5. GM Ram Soffer (Israel) 2667
6. GM Eddy Van Beers (Belgium) 2632
7. GM Anatoly Mukoseev (Russia) 2631
8. GM Arno Zude (Germany) 2626
9. GM Jonathan Mestel (United Kingdom) 2595
10. GM Ofer Comay (Israel) 2594

Rating list in 2023

July 1st 2023, Top 10:^[2]

1. GM Danila Pavlov (Russia) 2776
2. GM Georgy Evseev (Russia) 2747
3. Andrei Zhuravlev (Russia) 2683
4. GM Piotr Murdzia (Poland) 2661
5. GM Kacper Piorun (Poland) 2645
6. GM Eddy Van Beers (Belgium) 2636
7. GM John Nunn (United Kingdom) 2630
8. GM Ram Soffer (Israel) 2604
9. IM Ural Khasanov (Russia) 2602
10. Kevinas Kuznekovas (Lithuania) 2567

Team competition

• 1977 –  Finland
• 1978 – Finland
• 1979 –  West Germany
• 1980 –  Israel
• 1981 – Finland
• 1982 –  Yugoslavia
• 1983 – Finland
• 1984 – Finland
• 1985 – Finland
• 1986 –  Great Britain
• 1987 – West-Germany
• 1988 – West-Germany
• 1989 –  Soviet Union
• 1990 –  Great Britain and  Soviet Union
• 1991 –  Soviet Union
• 1992 –  Russia
• 1993 –  Germany
• 1994 – Germany
• 1995 –  Finland
• 1996 –  Israel
• 1997 – Israel
• 1998 –  Israel
• 1999 –  Russia
• 2000 –  Germany
• 2001 –  Israel
• 2002 – Germany
• 2003 –  Russia
• 2004 –  Israel
• 2005 –  Great Britain
• 2006 –  Great Britain
• 2007 –  Great Britain
• 2008 –  Russia
• 2009 –  Poland
• 2010 – Poland
• 2011 –  Poland
• 2012 –  Poland
• 2013 –  Poland
• 2014 –  Poland
• 2015 –  Poland
• 2016 –  Poland
• 2017 –  Poland
• 2018 –  Poland
• 2019 – Poland
• 2021 –  Russia
• 2022 –  Poland

Individual competition

• 1983 – Roland Baier (Switzerland)
• 1984 – Kari Valtonen (Finland)
• 1985 – Ofer Comay (Israel)
• 1986 – Pauli Perkonoja (Finland)
• 1987 – Michel Caillaud (France)
• 1988 – Michael Pfannkuche (Germany)
• 1989 – Georgy Evseev (USSR)
• 1990 – Georgy Evseev (USSR)
• 1991 – Georgy Evseev (USSR)
• 1992 – Pauli Perkonoja (Finland)
• 1993 – Michael Pfannkuche (Germany)
• 1994 – Arno Zude (Germany)
• 1995 – Pauli Perkonoja (Finland)
• 1996 – Noam Elkies (Israel)
• 1997 – Jonathan Mestel (Great Britain)
• 1998 – Georgy Evseev (Russia)
• 1999 – Ofer Comay (Israel)
• 2000 – Michel Caillaud (France)
• 2001 – Jorma Paavilainen (Finland)
• 2002 – Piotr Murdzia (Poland)
• 2003 – Andrey Selivanov (Russia)
• 2004 – John Nunn (Great Britain)
• 2005 – Piotr Murdzia (Poland)
• 2006 – Piotr Murdzia (Poland)
• 2007 – John Nunn (Great Britain)
• 2008 – Piotr Murdzia (Poland)
• 2009 – Piotr Murdzia (Poland)
• 2010 – John Nunn (Great Britain)
• 2011 – Kacper Piorun (Poland)
• 2012 – Piotr Murdzia (Poland)^[3]
• 2013 – Piotr Murdzia (Poland)^[4]
• 2014 – Kacper Piorun (Poland)
• 2015 – Kacper Piorun (Poland)
• 2016 – Kacper Piorun (Poland)
• 2017 – Kacper Piorun (Poland)
• 2018 – Piotr Murdzia (Poland)
• 2019 – Piotr Górski (Poland)^[5]
• 2021 – Danila Pavlov (Russia)
• 2022 – Danila Pavlov (Russia)