The Philadelphia Inquirer Sudoku National Championship, hosted by puzzle master Will Shortz, was an annual sudoku competition run by The Philadelphia Inquirer and held at the Pennsylvania Convention Center in 2007-2009. Open to a national and international field of contestants from a wide range of ages and backgrounds, the Championship offered three main skill divisions – advanced, intermediate and beginner. In addition to the winners of those three categories, prizes were awarded to many more players who compete in a variety of age groups ranging from under-10 years to 80-and-over. History The first annual Philadelphia Inquirer Sudoku National Championship event was held on October 20, 2007, and with 857 contestants, set the world record for “most people playing sudoku simultaneously,” according to Guinness World Records. 2007 On October 20, 2007 at the Pennsylvania Convention Center, the oldest participant of the Championship was 87 years old and the youngest was six years old. Players came from as far away as California and as near as Center City, Philadelphia. THE 2007 WINNERS Advanced: Carson Denny, Palo Alto, California ($10,000). He finished the final round in 7 minutes, 9 seconds. He was also awarded a spot on the U.S. National Sudoku Team at the 2008 World Sudoku Championship in India. Tammy McLeod, Los Angeles Sarah Ratcliffe, Glenside Intermediate: Ron Osher, Stamford, Connecticut ($5,000). Matthew Fabrizio, Philadelphia Vincent DeLuca, Swarthmore Beginner: Lori Desruisseaux, Elverson, Pennsylvania ($3,000). Danny Choi, Cherry Hill Mathew Bramucci, Lancaster 2008 On October 25, 2008 at the Pennsylvania Convention Center, the oldest participant was 88 years old and the youngest was 7 years old. Players came from as far away as Ireland and Canada, and as near as Center City, Philadelphia. THE 2008 WINNERS Advanced: Wei-Hwa Huang, Mountain View, California ($10,000 prize). He finished the final round in 7 minutes, 39 seconds. He was also awarded a spot on the U.S. National Sudoku Team at the 2009 World Sudoku Championship in Slovakia. Thomas Snyder, Palo Alto, California ($2,000). He finished in first place in 2007 and then went on to his second world-championship win. Tammy McLeod, Los Angeles, California ($400). Intermediate: Chris Narrikkattu, New York ($5,000), 9:32. Vincent DeLuca, Swarthmore, Pennsylvania ($1,000). Brittnay Guld, Philadelphia, Pennsylvania ($200). Beginner: Lisa J. Haffner, Philadelphia, Pennsylvania ($3,000), 7:40. Lauren Choi, Rockville, Maryland ($600). Stefanie Jasinski, Philadelphia, Pennsylvania ($150). 2009 The 2009 Philadelphia Inquirer Sudoku National Championship took place Saturday, October 24, 2009 at the