Modified to do triples: Testing Sudoku Puzzles Puzzle 1 Evil # 10,107,075,407 _ _ _ _ _ 6 1 8 _ _ 8 _ _ 7 _ 3 9 _ _ 3 _ 4 _ _ 7 _ _ _ _ _ 5 _ _ 8 _ _ 9 _ _ _ _ _ _ _ 1 _ _ 7 _ _ 1 _ _ _ _ _ 9 _ _ 3 _ 5 _ _ 7 5 _ 6 _ _ 3 _ _ 2 6 9 _ _ _ _ _ . . Solving Sudoku . . . Sudoku is not solved. Trying advanced techniques. 7 9 [2,4] [2,3] [2,3,5] 6 1 8 [2,4,5] [1,4,5,6] 8 [1,2,4] [1,2] 7 [2,5] 3 9 [2,4,5,6] [1,5,6] 3 [1,2] 4 [1,2,5,8,9] [2,5,8,9] 7 [2,6] [2,5,6] [1,2,4] [1,4,6] 3 5 [2,4,9] [2,4,7,9] 8 [2,4,6,7] [2,6,9] 9 [4,5,6] 8 [2,3,6,7] [2,3,4] [2,4,7] [2,5,6] [2,4,6,7] 1 [2,4] [4,5,6] 7 [2,6,8] [2,4,8,9] 1 [2,5,6,9] [2,4,6] 3 [1,4,8] [1,4] 9 [1,2,7,8] [1,2,4,8] 3 [2,6] 5 [2,6,7,8] [1,4,8] 7 5 [1,2,8] 6 [2,4,8] [2,9] 3 [2,8,9] 3 2 6 9 [5,8] [5,7,8] 4 1 [7,8] applied square rule applied square rule applied triples rule 7 9 [2,4] [2,3] [2,3,5] 6 1 8 [2,4,5] [1,4,5,6] 8 [1,2,4] [1,2] 7 [2,5] 3 9 [2,4,5,6] [1,5,6] 3 [1,2] 4 [1,2,5,8,9] [2,5,8,9] 7 [2,6] [2,5,6] [1,2,4] [1,4,6] 3 5 [2,4,9] [2,4,7,9] 8 [2,4,6,7] [2,6,9] 9 [4,5,6] 8 [2,3,6,7] [2,3,4] [2,4,7] [2,5,6] [2,4,6,7] 1 [2,4] [4,5,6] 7 [2,6,8] [2,4,8,9] 1 [2,5,6,9] [2,4,6] 3 [1,4,8] [1,4] 9 [1,2,7,8] [1,2,4,8] 3 [2,6] 5 [2,6,7,8] [1,4,8] 7 5 [1,2,8] 6 [2,4,8] [2,9] 3 [2,8,9] 3 2 6 9 [5,8] [5,7,8] 4 1 [7,8] Time (483 ms) Updated Table to show solved squares 7 9 _ _ _ 6 1 8 _ _ 8 _ _ 7 _ 3 9 _ _ 3 _ 4 _ _ 7 _ _ _ _ 3 5 _ _ 8 _ _ 9 _ 8 _ _ _ _ _ 1 _ _ 7 _ _ 1 _ _ 3 _ _ 9 _ _ 3 _ 5 _ _ 7 5 _ 6 _ _ 3 _ 3 2 6 9 _ _ 4 1 _ _______________________________________________________________________ Puzzle 2 Evil # 7,777,777,777 _ _ 9 7 _ _ _ _ 5 7 _ _ _ _ 9 _ _ _ 4 _ 1 _ _ _ _ 2 _ _ _ 8 3 4 7 _ _ 9 _ _ _ _ _ _ _ _ _ 3 _ _ 6 1 8 4 _ _ _ 4 _ _ _ _ 7 _ 3 _ _ _ 8 _ _ _ _ 6 6 _ _ _ _ 3 2 _ _ Sudoku is not solved. Trying advanced techniques. [2,8] [2,3,8] 9 7 [2,3,8] [1,2,4] [1,3,6,8] [1,3,4,6,8] 5 7 5 6 [1,2,4] [2,3,8] 9 [1,3,8] [1,3,4,8] [1,4,8] 4 [3,8] 1 5 [3,8] 6 9 2 7 [1,2,5] [1,2,6] 8 3 4 7 [1,5,6] [1,5,6] 9 [1,2,5] [1,2,6,7] 4 [2,9] [2,5,9] [2,5] [1,3,5,6,8] [1,3,5,6,7,8] [1,8] 3 9 [5,7] 6 1 8 4 [5,7] 2 [1,5,8,9] 4 2 [1,9] 6 [1,5] 7 [1,5,8,9] 3 [1,5,9] [1,7] 3 8 [2,5,7,9] [1,2,4,5] [1,5] [1,4,5,9] 6 6 [1,7,8] [5,7] [1,4,9] [5,7,9] 3 2 [1,4,5,8,9] [1,4,8] applied square rule applied square rule <--- NOT SURE WHY applied triples rule Comment didn't appear? Sudoku is solved. 8 2 9 7 3 4 6 1 5 7 5 6 1 2 9 8 3 4 4 3 1 5 8 6 9 2 7 2 6 8 3 4 7 1 5 9 1 7 4 2 9 5 3 6 8 3 9 5 6 1 8 4 7 2 5 4 2 9 6 1 7 8 3 9 1 3 8 7 2 5 4 6 6 8 7 4 5 3 2 9 1 This Puzzle Failed Originally, leads me to beleive additional rules for Triples helped _______________________________________________________________________________________________________________ Puzzle 4 Evil # 7,304,228,637 1 4 _ _ _ _ _ 2 _ _ _ 7 _ _ _ 8 _ _ _ _ _ 7 _ _ 1 _ 4 _ 1 _ _ 2 6 _ _ 3 _ 3 _ _ _ _ _ 6 _ 7 _ _ 3 5 _ _ 4 _ 3 _ 2 _ _ 1 _ _ _ _ _ 8 _ _ _ 5 _ _ _ 7 _ _ _ _ _ 3 8 . . Solving Sudoku . . . Sudoku is not solved. Trying advanced techniques. 1 4 [5,6,9] [5,6,8,9] [6,8,9] [5,8,9] 3 2 7 [2,5,9] [2,5,9] 7 [1,2,4,5,9] [1,3,4,9] [2,3,4,5,9] 8 [5,9] 6 [2,5,6,8,9] [2,5,6,8,9] 3 7 [6,9] [2,5,9] 1 [5,9] 4 [5,9] 1 [4,5,9] [4,9] 2 6 7 8 3 [2,8,9] 3 [4,9] [1,4,8,9] [1,4,7,8,9] [4,7,8,9] [2,9] 6 5 7 [2,6,8,9] [6,9] 3 5 [8,9] [2,9] 4 1 3 [5,6] 2 [4,5,6,8] [4,6,8] 1 [4,6] 7 9 [4,6,9] [6,9] 8 [4,6,9] [3,4,6,7,9] [3,4,7,9] 5 1 2 [4,5,6,9] 7 1 [2,4,5,6,9] [4,6,9] [2,4,5,9] [4,6] 3 8 applied square rule applied square rule applied triples rule 1 4 [5,6,9] [5,6,8,9] [6,8,9] [5,8,9] 3 2 7 [2,5,9] [2,5,9] 7 [1,4] [1,3,4] [3,4] 8 [5,9] 6 [5,6,8,9] [5,6,8,9] 3 7 [6,9] 2 1 [5,9] 4 [5,9] 1 [4,5,9] [4,9] 2 6 7 8 3 [2,8,9] 3 [4,9] [1,4,8,9] [1,4,7,8,9] [4,7,8,9] [2,9] 6 5 7 [2,6,8,9] [6,9] 3 5 [8,9] [2,9] 4 1 3 [5,6] 2 [4,5,6,8] [4,6,8] 1 [4,6] 7 9 [4,6,9] [6,9] 8 [4,6,9] [3,7] [3,7] 5 1 2 [4,5,6,9] 7 1 2 [4,6,9] [4,5,9] [4,6] 3 8 Time (370 ms) yes Updated to show Squares that were solved 1 4 _ _ _ _ 3 2 7 _ _ 7 _ _ _ 8 _ 6 _ _ 3 7 _ _ 1 _ 4 _ 1 _ _ 2 6 7 8 3 _ 3 _ _ _ _ _ 6 5 7 _ _ 3 5 _ _ 4 1 3 _ 2 _ _ 1 _ 7 9 _ _ 8 _ _ _ 5 1 2 _ 7 1 _ _ _ _ 3 8