World Puzzle Championship

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The World Puzzle Championship (commonly abbreviated as WPC) is an annual international puzzle competition run by the World Puzzle Federation. All the puzzles in the competition are pure-logic problems based on simple principles, designed to be playable regardless of language or culture. [1]

Contents

National teams are determined by local affiliates of the World Puzzle Federation. Of the 30 championships (team category) held thus far, 16 have been won by the United States, 8 by Germany, and 3 each by the Czech Republic and Japan. The most successful individual contestant is Ulrich Voigt (Germany) with 11 titles since 2000.

The latest WPC was held in October 2023 in Canada. [2]

Origin

The World Puzzle Championship was the brainchild of Levi Summers, who wanted to create an event where puzzlers from different countries could compete on an even playing field. [3] Previously, the International Crossword Marathon was the major international competition for puzzle-solving, and Shortz had attended it every year, but because participants used their own language and crossword rules, it was not a very good basis for comparing raw puzzle-solving skills across cultures. Shortz created the WPC to overcome these flaws. [1] As described by Nick Baxter, co-director of the U.S. Puzzle Championship, the challenge of the competition is speed. [4]

The first WPC was held in New York City in 1992, and Shortz was the organizer and Helene Hovanec was the coordinator. Each WPC has been held at a different city since then.

Participants

Currently, 34 countries are official members of the World Puzzle Federation. [5] Individuals may also take part if their country is not already represented by a national team. [6] [7] In the 2017 WPC, 169 contestants from 27 countries participated. [8] The United States has won the championship 16 times, followed by Germany with 8 championships. The Czech Republic and Japan has each won three times. Ulrich Voigt of Germany has been the most successful individual contestant, winning the gold medal eleven times since 2000. Wei-Hwa Huang of the United States won four of the first eight championships in the 1990s. Ken Endo of Japan won four of the most recent seven championships.

Results summary

Host city
IndividualTeam
YearCityCountryGoldSilverBronzeGoldSilverBronzeRef.
1992 New York City Flag of the United States (23px).png  United States Flag of Canada (Pantone).svg David Samuel Flag of Canada (Pantone).svg Darren Rigby Flag of the United States.svg Daniel JohnsonFlag of the United States (23px).png  United States Flag of Argentina.svg  Argentina Flag of Poland.svg  Poland [9]
1993 Brno Flag of the Czech Republic.svg  Czech Republic Flag of the Czech Republic.svg Robert Babilon Flag of the United States.svg Wei-Hwa Huang Flag of the Czech Republic.svg Pavel KalhousFlag of the Czech Republic.svg  Czech Republic Flag of the United States (23px).png  United States Flag of Canada (Pantone).svg  Canada [10]
1994 Cologne Flag of Germany.svg  Germany Flag of the United States.svg Ron Osher Flag of the Czech Republic.svg Pavel Kalhous Flag of Croatia.svg Pero GalogazaFlag of the Czech Republic.svg  Czech Republic Flag of the United States (23px).png  United States Flag of Croatia.svg  Croatia [11]
1995 Poiana Brasov Flag of Romania.svg  Romania Flag of the United States.svg Wei-Hwa Huang Flag of Hungary.svg Gyorgy Istvan Flag of the Czech Republic.svg Pavel KalhousFlag of the United States (23px).png  United States Flag of the Czech Republic.svg  Czech Republic Flag of Hungary.svg  Hungary [12]
1996 Utrecht Flag of the Netherlands.svg  Netherlands Flag of the Czech Republic.svg Robert Babilon Flag of the United States.svg Zack Butler Flag of the United States.svg Wei-Hwa HuangFlag of the United States (23px).png  United States Flag of the Czech Republic.svg  Czech Republic Flag of Turkey.svg  Turkey [13]
1997 Koprivnica Flag of Croatia.svg  Croatia Flag of the United States.svg Wei-Hwa Huang Flag of the United States.svg Ron Osher Flag of the Czech Republic.svg Robert BabilonFlag of the Czech Republic.svg  Czech Republic Flag of the United States (23px).png  United States Flag of Hungary.svg  Hungary [14]
1998 Istanbul Flag of Turkey.svg  Turkey Flag of the United States.svg Wei-Hwa Huang Flag of Japan.svg Akira Nakai Flag of the United States.svg Zack ButlerFlag of the United States (23px).png  United States Flag of Japan.svg  Japan Flag of Hungary.svg  Hungary [15]
1999 Budapest Flag of Hungary.svg  Hungary Flag of the United States.svg Wei-Hwa Huang Flag of the United States.svg Zack Butler Flag of the Netherlands.svg Niels RoestFlag of the United States (23px).png  United States Flag of the Netherlands.svg  Netherlands Flag of the Czech Republic.svg  Czech Republic [16]
2000 Stamford Flag of the United States (23px).png  United States Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Wei-Hwa Huang Flag of the Netherlands.svg Niels RoestFlag of the United States (23px).png  United States Flag of the Netherlands.svg  Netherlands Flag of Germany.svg  Germany [17]
2001 Brno Flag of the Czech Republic.svg  Czech Republic Flag of Germany.svg Ulrich Voigt Flag of the Czech Republic.svg Robert Babilon Flag of the United States.svg Zack ButlerFlag of the United States (23px).png  United States Flag of the Czech Republic.svg  Czech Republic Flag of Belgium (civil).svg  Belgium [18]
2002 Oulu Flag of Finland.svg  Finland Flag of the Netherlands.svg Niels Roest Flag of Germany.svg Roland Voigt Flag of Germany.svg Ulrich VoigtFlag of Japan.svg  Japan Flag of Germany.svg  Germany Flag of the United States (23px).png  United States [19]
2003 Arnhem Flag of the Netherlands.svg  Netherlands Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Wei-Hwa Huang Flag of the United States.svg Roger BarkanFlag of Germany.svg  Germany Flag of the United States (23px).png  United States Flag of the Netherlands.svg  Netherlands [20]
2004 Opatija Flag of Croatia.svg  Croatia Flag of the Netherlands.svg Niels Roest Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Roger BarkanFlag of the United States (23px).png  United States Flag of Germany.svg  Germany Flag of Hungary.svg  Hungary [21]
2005 Eger Flag of Hungary.svg  Hungary Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Wei-Hwa Huang Flag of the Netherlands.svg Niels RoestFlag of Germany.svg  Germany Flag of the United States (23px).png  United States Flag of Japan.svg  Japan [22]
2006 Borovets Flag of Bulgaria.svg  Bulgaria Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Wei-Hwa Huang Flag of Japan.svg Maho YokotaFlag of the United States (23px).png  United States Flag of Germany.svg  Germany Flag of Japan.svg  Japan [23]
2007 Rio de Janeiro Flag of Brazil.svg  Brazil Flag of Hungary.svg Pal Madarassy Flag of the United States.svg Thomas Snyder Flag of Germany.svg Ulrich VoigtFlag of the United States (23px).png  United States Flag of Japan.svg  Japan Flag of Belgium (civil).svg  Belgium [24]
2008 Minsk Flag of Belarus.svg  Belarus Flag of Germany.svg Ulrich Voigt Flag of Turkey.svg Mehmet Murat Sevim Flag of the United States.svg Roger BarkanFlag of the United States (23px).png  United States Flag of Japan.svg  Japan Flag of the Czech Republic.svg  Czech Republic [25]
2009 Antalya Flag of Turkey.svg  Turkey Flag of Germany.svg Ulrich Voigt Flag of Slovakia.svg Peter Hudák Flag of Turkey.svg Mehmet Murat SevimFlag of Germany.svg  Germany Flag of the United States (23px).png  United States Flag of Japan.svg  Japan [26]
2010 Paprotnia Flag of Poland.svg  Poland Flag of Japan.svg Taro Arimatsu Flag of Germany.svg Ulrich Voigt Flag of Japan.svg Hideaki JoFlag of the United States (23px).png  United States Flag of Japan.svg  Japan Flag of Germany.svg  Germany [27]
2011 Eger Flag of Hungary.svg  Hungary Flag of the United States.svg Palmer Mebane Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Thomas SnyderFlag of the United States (23px).png  United States Flag of Germany.svg  Germany Flag of Japan.svg  Japan [28]
2012 Kraljevica Flag of Croatia.svg  Croatia Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Thomas Snyder Flag of the United States.svg Palmer MebaneFlag of Germany.svg  Germany Flag of Japan.svg  Japan Flag of the United States (23px).png  United States [29]
2013 Beijing Flag of the People's Republic of China.svg  China Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Palmer Mebane Flag of the United States.svg Thomas SnyderFlag of the United States (23px).png  United States Flag of Germany.svg  Germany Flag of Japan.svg  Japan [30]
2014 London Flag of the United Kingdom.svg  United Kingdom Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Palmer Mebane Flag of Germany.svg Florian KirchFlag of Germany.svg  Germany Flag of Japan.svg  Japan Flag of the United States (23px).png  United States [31]
2015 Sofia Flag of Bulgaria.svg  Bulgaria Flag of Japan.svg Ken Endo Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Palmer MebaneFlag of Germany.svg  Germany Flag of Japan.svg  Japan Flag of the United States (23px).png  United States [32]
2016 Senec Flag of Slovakia.svg  Slovakia Flag of Germany.svg Ulrich Voigt Flag of the United States.svg Palmer Mebane Flag of Japan.svg Ken EndoFlag of Germany.svg  Germany Flag of Japan.svg  Japan Flag of the United States (23px).png  United States
2017 Bangalore Flag of India.svg  India Flag of Japan.svg Ken Endo Flag of Germany.svg Ulrich Voigt Flag of Japan.svg Kota MorinishiFlag of Japan.svg  Japan Flag of the United States (23px).png  United States Flag of Germany.svg  Germany [33]
2018 Prague Flag of the Czech Republic.svg  Czech Republic Flag of the United States.svg Thomas Snyder Flag of Germany.svg Ulrich Voigt Flag of Japan.svg Ken EndoFlag of Germany.svg  Germany Flag of the United States (23px).png  United States Flag of Hungary.svg  Hungary [34]
2019 Kirchheim Flag of Germany.svg  Germany Flag of Germany.svg Philipp Weiß Flag of Japan.svg Ken Endo Flag of the United States.svg Walker AndersonFlag of the United States (23px).png  United States Flag of Germany.svg  Germany Flag of Japan.svg  Japan [35]
2020 Shanghai Flag of the People's Republic of China.svg  China cancelled due to the COVID-19 pandemic [36]
2021 Shanghai Flag of the People's Republic of China.svg  China
2022 Kraków Flag of Poland.svg  Poland Flag of Japan.svg Ken Endo Flag of India.svg Prasanna Seshadri Flag of the United States.svg Thomas LuoFlag of Japan.svg  Japan Flag of the United States (23px).png  United States Flag of Germany.svg  Germany [37]
2023 Toronto Flag of Canada (Pantone).svg  Canada Flag of Japan.svg Ken Endo Flag of the United States.svg Walker Anderson Flag of the United States.svg Thomas LuoFlag of the United States (23px).png  United States Flag of Germany.svg  Germany Flag of Japan.svg  Japan [38]

Age-restricted categories

Starting from 2013, titles have been awarded also for the best players in two age categories, Under 18 and Over 50 years of age.

Location
Under 18Over 50
YearCityCountryGoldSilverBronzeGoldSilverBronzeRef.
2013 Beijing Flag of the People's Republic of China.svg  China Flag of the People's Republic of China.svg Qiu Yanzhe Flag of Slovakia.svg Jakub Bahyl Flag of Slovakia.svg Zuzana Hromcová Flag of Italy.svg Stefano Forcolin Flag of the United States.svg Nick Baxter Flag of Finland.svg Jouni Juhani Särkijärvi [30]
2014 London Flag of the United Kingdom.svg  United Kingdom Flag of the People's Republic of China.svg Qiu Yanzhe Flag of France.svg Olivier Garçonnet Flag of Turkey.svg Mehmet Durmuş Flag of Italy.svg Stefano Forcolin Flag of the Czech Republic.svg Jiří Hrdina Flag of the United States.svg Nick Baxter [39]
2015 Sofia Flag of Bulgaria.svg  Bulgaria Flag of the People's Republic of China.svg Qiu Yanzhe Flag of France.svg Olivier Garçonnet Flag of Slovakia.svg Pavol Kollár Flag of the United Kingdom.svg David McNeill Flag of Italy.svg Stefano Forcolin Flag of Serbia.svg Zoran Tanasić [32]
2016 Senec Flag of Slovakia.svg  Slovakia Flag of the People's Republic of China.svg Qiu Yanzhe Flag of Slovakia.svg Pavol Kollár Flag of France.svg Olivier Garçonnet Flag of Japan.svg Taro Arimatsu Flag of Italy.svg Stefano Forcolin Flag of Hungary.svg Miklós Mócsy
2017 Bangalore Flag of India.svg  India Flag of the United States.svg Walker Anderson Flag of Slovakia.svg Pavol Kollár Flag of South Korea.svg Kang Hyunmo Flag of Japan.svg Taro Arimatsu Flag of the United Kingdom.svg David McNeill Flag of Germany.svg Michael Smit [33]
2018 Prague Flag of the Czech Republic.svg  Czech Republic Flag of the United States.svg Walker Anderson Flag of the People's Republic of China.svg Tantan Dai Flag of Bulgaria.svg Ivan Georgiev Flag of Japan.svg Taro Arimatsu Flag of Serbia.svg Cedomir Milanovic Flag of Germany.svg Michael Smit
2019 Kirchheim Flag of Germany.svg  Germany Flag of the United States.svg Walker Anderson Flag of Japan.svg Ryotaro Chiba Flag of Hungary.svg Péter Gyimesi Flag of Japan.svg Taro Arimatsu Flag of the United Kingdom.svg David McNeill Flag of Serbia.svg Cedomir Milanovic
2020 Shanghai Flag of the People's Republic of China.svg  China cancelled due to the COVID-19 pandemic [36]
2021 Shanghai Flag of the People's Republic of China.svg  China
2022 Kraków Flag of Poland.svg  Poland Flag of India.svg Nityant Agriwal Flag of South Korea.svg Yoon Geonwoo Flag of Turkey.svg Ahmet Eren Gozubenli Flag of Japan.svg Taro Arimatsu Flag of Bulgaria.svg Deyan Razsadov Flag of Serbia.svg Cedomir Milanovic [37]
2023 Toronto Flag of Canada (Pantone).svg  Canada Flag of the People's Republic of China.svg Qiu Suzhe Flag of France.svg Valentin Maikinen Flag of Poland.svg Maciej Ignaciuk Flag of Bulgaria.svg Deyan Razsadov Flag of Luxembourg.svg Claudine Thiry Flag of France.svg Philippe Meyer [38]

Classic puzzles used

Incomplete list, in alphabetical order:

See also

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References

  1. 1 2 Grossman, Lev (11 March 2013). "The Answer Men". Time. Archived from the original on March 1, 2013. Retrieved 4 March 2013.(registration required)
  2. "WSPC 2023" . Retrieved 2024-02-28.
  3. Harvey, Jay (Feb 26, 2013). "Will Shortz will deal with crosswords and other puzzles at Butler University April 12". IndyStar. Retrieved 20 March 2013.
  4. Antonick, Gary (March 11, 2013). "A Poker Puzzle From the Logic Olympics". The New York Times. Retrieved 20 March 2013.
  5. "WPF Members". World Puzzle Federation. Retrieved 24 October 2018.
  6. "WPF Members". World Puzzle Federation. Retrieved 20 March 2013.
  7. Ratzlav-Katz, Nissan (3 November 2009). "First Israeli at World Puzzle Championship". Israel National News. Retrieved 20 March 2013.
  8. Shortz, Will (October 23, 2017). "Japan Wins World Puzzle Championship, U.S.A. Takes Second". The New York Times.
  9. "The 1st World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  10. "The 2nd World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  11. "The 3rd World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  12. "The 4th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  13. "The 5th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  14. "The 6th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  15. "The 7th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  16. "The 8th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  17. "The 9th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  18. "The 10th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  19. "The 11th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  20. "The 12th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  21. "The 13th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  22. "The 14th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  23. "The 15th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  24. "The 16th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  25. "The 17th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  26. "The 18th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  27. "The 19th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  28. "The 20th World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  29. "The 21st World Puzzle Championship". World Puzzle Federation. Retrieved 20 March 2013.
  30. 1 2 "The 22nd World Puzzle Championship". World Puzzle Federation. Retrieved 23 October 2013.
  31. "2014 WSC & WPC award winners". UK Puzzle Association. Retrieved 18 August 2014.
  32. 1 2 "The 24th World Puzzle Championship". World Puzzle Federation. Retrieved 7 November 2015.
  33. 1 2 "WSPC 2017 - Logic Masters India". Logic Masters India. Retrieved 29 October 2017.
  34. "27th World Puzzle Championship" (PDF). World Puzzle Federation. Retrieved 19 December 2020.
  35. "WSPC 2019 WPC - Results". World Sudoku & Puzzle Championship 2019. Retrieved 4 July 2022.
  36. 1 2 "World Puzzle Championships". World Puzzle Federation. Retrieved 4 July 2022.
  37. 1 2 "Home - World Sudoku & Puzzle Championships 2022". www.wspc2022.com. Retrieved 2024-02-28.
  38. 1 2 "2023 World Sudoku and Puzzle Championship". www.wspc2023.com. Retrieved 2024-02-28.
  39. "2014 WSC & WPC award winners". UK Puzzle Association. Retrieved 18 August 2014.