Backtracking means switching back to the previous step as soon as we determine that our current solution cannot be continued into a complete one. We’ll use the backtracking method to create our sudoku solver in Python. As our assumption was wrong, we discard the assigned num and then we go for the next assumption with a different num value.Later we check for the next possibility with the next column. After checking if it is a safe place, we move to the next column and then assign the num in the current (row, col) position of the grid.Further now we see if the current position of the grid has a value greater than 0, then we iterate for the next column.Next, we will check if the column value becomes 9 then we move to the next row and column.Then we will check if we have reached the 8th row and 9th column and return true for stopping further backtracking.If we find the same num in the same row or same column or in the specific 3*3 matrix, ‘false’ will be returned.Later it will assign num to the row and col.Then we assign the utility function (puzzle) to print the grid.In this method for solving the sudoku puzzle, first, we assign the size of the 2D matrix to a variable M (M*M).Steps to solve the Sudoku Puzzle in Python The lesser the clues, the higher the chances of multiple solutions. It is unknown whether or not there exists a well-formed puzzle with only 16 clues.
Well-formed Sudoku with 17 symbols exists. Another challenging research problem is to determine how few boxes need to be filled for a Sudoku puzzle to be well-formed. A Sudoku puzzle is believed to be well-formed if it has a unique solution. The Sudoku puzzles which are published for entertainment have unique solutions. Difficult puzzles mostly have less prescribed symbols. The more the difficulty level of Sudoku puzzles, the more challenging the research problem it becomes for computational scientists. The difficulty of this puzzle might vary. In the Sudoku puzzle, we need to fill in every empty box with an integer between 1 and 9 in such a way that every number from 1 up to 9 appears once in every row, every column, and every one of the small 3 by 3 boxes highlighted with thick borders. There are a lot of difficult, unsolved problems about sudoku puzzles and their generalizations which makes this puzzle interesting, specifically to a lot of mathematics lovers. Let’s build a sudoku solver in Python today! Sudoku Puzzle is a very popular puzzle that appears in the daily newspaper that attracts the attention of a lot of people.
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