Pennsylvania Convention Center in Philadelphia. Advanced: First place - Tammy McLeod, Los Angeles, California ($10,000 prize) in 7:41 with no mistakes. Second place - Thomas Snyder, Palo Alto, California ($4,000 prize) in 4:14 with three mistakes. Snyder had made a transposition error in his grid costing him the title. Third place - Chris Narrikkattu, New York ($3,000 prize) after disqualification of Eugene Varshavsky. Disqualified - Eugene Varshavsky, Lawrenceville, New Jersey - incomplete, with 3 numbers filled in after 8 minutes. Intermediate: First place - Davis Borucki, Columbia, South Carolina ($3,000) in 8:42. Second place - Andrea Kanner, Boston, Massachusetts ($2,000) Third place - Vincent DeLuca, Swarthmore, Pennsylvania ($1,500) Beginner: First place - Natan Tsyrulnik, Shelton, Connecticut ($1,000) in 8:24. Second place - Tori Spofford, West Chester, Pennsylvania ($500) Third place - Rosalie Hooper, Ambler, Pennsylvania ($300) Separate 50 dollar prizes were also given in 27 age categories. Following the tournament, questions were raised by competitors including 2nd place finisher Thomas Snyder about the performance of Eugene Varshavsky in the tournament. Wearing a hooded sweatshirt during the competition, Varshavsky came nowhere close to his qualifying performance on stage which called into question his abilities as a legitimate sudoku contestant. Following a review of his performance including a retest on similar sudoku puzzles, Varshavsky was disqualified and Chris Narrikkattu, who would have qualified in the same round, was made the third place winner. 2010 The 2010 World Sudoku Championship was held in Philadelphia, Pennsylvania in April 2010. External links The Philadelphia Inquirer Sudoku National Championship Official web site Notes Puzzle competitions Sudoku competitions