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Japanese wins World Sudoku Championship in London

TOKYO, Japan - The UK Puzzle Association announces on Aug. 20, 2014, that Kota Morinishi (R), a Tokyo University Graduate School student, won the 2014 World Sudoku Championship held in London, Britain, earlier this month. The 25-year-old Japanese also won the 2012 International Sudoku Tournament in Beijing as shown in this file photo taken in May that year.

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Japanese graduate student wins world Sudoku competition

BEIJING, China - Kota Morinishi (R), a University of Tokyo graduate student, holds a prize check after winning the 2012 Beijing International Sudoku Contest in Beijing on May 20, 2012. Sudoku, a numerical puzzle in which an 81-square grid must have each row and column filled with the digits from 1 to 9, was named by a Japanese publisher and has become highly popular in Europe and the United States, with an increasing number of devotees in China.

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Japanese graduate student wins world Sudoku competition

BEIJING, China - Kota Morinishi (R), a University of Tokyo graduate student, holds a prize check after winning the 2012 Beijing International Sudoku Contest in Beijing on May 20, 2012. Sudoku, a numerical puzzle in which an 81-square grid must have each row and column filled with the digits from 1 to 9, was named by a Japanese publisher and has become highly popular in Europe and the United States, with an increasing number of devotees in China. (Kyodo)

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Japanese wins World Sudoku Championship in London

TOKYO, Japan - The UK Puzzle Association announces on Aug. 20, 2014, that Kota Morinishi (R), a Tokyo University Graduate School student, won the 2014 World Sudoku Championship held in London, Britain, earlier this month. The 25-year-old Japanese also won the 2012 International Sudoku Tournament in Beijing as shown in this file photo taken in May that year. (Kyodo)

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World Sudoku & Puzzle Championship in Prague, Jakub Ondrousek

The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo is seen Jakub Ondrousek from Czech Republic. Until now, Ondrousek was the world record holder. He solved the sudoku grid in 1 minute and 25 seconds in 2010. (CTK Photo/Michaela Rihova)

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World Sudoku & Puzzle Championship in Prague, Jakub Ondrousek, Letian Ming

The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo are seen Jakub Ondrousek (right) from Czech Republic and Letian Ming (left) from China. Until now, Ondrousek was the world record holder. He solved the sudoku grid in 1 minute and 25 seconds in 2010. (CTK Photo/Michaela Rihova)

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World Sudoku & Puzzle Championship in Prague, Jan Morozowski

The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo is seen Jan Morozowski from Poland. (CTK Photo/Michaela Rihova)

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World Sudoku & Puzzle Championship in Prague, Letian Ming

The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo is seen Letian Ming from China. (CTK Photo/Michaela Rihova)

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World Sudoku & Puzzle Championship in Prague

The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. (CTK Photo/Michaela Rihova)

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World Sudoku & Puzzle Championship in Prague, Letian Ming

The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the right side is seen Letian Ming from China. (CTK Photo/Michaela Rihova)

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World Sudoku & Puzzle Championship in Prague, Shiyao Wang, new world record holder

The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo is seen Shiyao Wang from China who managed to solve the 9x9 sudoku grid in 54.44 seconds at the championship, which is the new world record. (CTK Photo/Michaela Rihova)

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World Sudoku & Puzzle Championship in Prague, Shiyao Wang, new world record holder, Roman Sebrle

The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo is seen Shiyao Wang (left)from China who managed to solve the 9x9 sudoku grid in 54.44 seconds at the championship, which is the new world record. On the right side is seen former Czech athlete Roman Sebrle, patron of the championship. (CTK Photo/Michaela Rihova)