TheWorld Chess Solving Championship (WCSC) is an annual competition in the solving ofchess problems (also known as chess puzzles) organized by theWorld Federation for Chess Composition (WFCC), previously byFIDE via thePermanent Commission of the FIDE for Chess Compositions (PCCC).

The participants must solve a series of different types of chess problem in a set amount of time. Points are awarded for correct solutions in the least amount of time. The highest score at the end of the competition is proclaimed the winner.

The Tournament consists of six rounds over two days, with three rounds each day according to the following table:

• Round 1 – 3twomovers 20 minutes solving time
• Round 2 – 3 threemovers 60 minutes solving time
• Round 3 – 3endgame studies 100 minutes solving time
• Round 4 – 3helpmates 50 minutes solving time
• Round 5 – 3 moremovers 80 minutes solving time
• Round 6 – 3selfmates 50 minutes solving time

• Team Championship – To qualify as an official team world championship, there must be at least seven teams from seven countries present. This section has grown from nine teams in 1977 to now averaging 20.
• Individual – Likewise, for an official individual world championship to take place, 30 solvers from at least 10 countries must participate. This number too has grown from 18 in 1977 to well over 70 in the past six years (as of 2007).
• Women and Juniors (up to 23 years old) – This event only requires 10 solvers from at least seven countries.

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 =${\displaystyle \frac{1}{n}\sum _{i=1}^n(R_i-\text{AveRat}{)}^2}$
• Covar =covariance between ratings and scores =${\displaystyle (\frac{1}{n}\sum _{i=1}^n{R}_i{S}_i)-\text{AveRat}\cdot \text{AveSco}}$
• Slope =${\displaystyle \frac{\text{Covar}}{\text{VarRat}}}$
• Intercept =${\displaystyle \text{AveSco}-\text{Slope}\cdot \text{AveRat}}$

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 =${\displaystyle \frac{\text{Score of player}-\text{Intercept}}{\text{Slope}}}$

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

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

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^{[citation needed]}.

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

1. GMGeorgy Evseev (Russia) 2785
2. GMKacper Piorun (Poland) 2744
3. GMPiotr Murdzia (Poland) 2742
4. GMJohn Nunn (United Kingdom) 2716
5. GMRam Soffer (Israel) 2667
6. GMEddy Van Beers (Belgium) 2632
7. GMAnatoly Mukoseev (Russia) 2631
8. GMArno Zude (Germany) 2626
9. GMJonathan Mestel (United Kingdom) 2595
10. GMOfer Comay (Israel) 2594

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

1. GMDanila Pavlov (Russia) 2776
2. GMGeorgy Evseev (Russia) 2747
3. Andrei Zhuravlev (Russia) 2683
4. GMPiotr Murdzia (Poland) 2661
5. GMKacper Piorun (Poland) 2645
6. GMEddy Van Beers (Belgium) 2636
7. GMJohn Nunn (United Kingdom) 2630
8. GMRam Soffer (Israel) 2604
9. IMUral Khasanov (Russia) 2602
10. Kevinas Kuznekovas (Lithuania) 2567

• 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
• 2023 – Poland
• 2024 – Great Britain
• 2025 – Poland

• 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)
• 2023 –Danila Pavlov (Russia)^[6]
• 2024 –Kacper Piorun (Poland)^[7]
• 2025 –Piotr Murdzia (Poland)^[8]

• World championships in chess
• Chess problems

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