How to Use the Open Single Strategy
The Open Single strategy is based on a simple rule: if a row, column, or has eight numbers already filled in, the last remaining cell must be filled with the missing number. This missing number is what we call an Open Single.
To identify an Open Single, you need to look for a cell that has only one possible number that can be filled in. This number must be missing from the row, column, or box where the cell is located.
For example, in the image, the yellow cell is automatically an 7 because it is the only missing number in its row, column, or box. It's that easy!
The Open Single strategy is a great way to build your confidence and skills in solving Sudoku puzzles. Since it's simple to recognize and solve, any Sudoku player should be able to use it. You'll be able to solve puzzles more quickly and advance to more difficult strategies like the X-Wing and Swordfish strategies by practicing this method.
In conclusion, the Open Single strategy is an essential tool for any Sudoku player. It's a simple method that speeds up puzzle solving and allows you to fill in blanks where numbers are missing.
