We left off last time finishing all the horizontal and vertical gimmies in the puzzle. These are the numbers that it takes little effort to find. Remember the technique (check rows and columns of containers for duplicates and then see if the remaining container has a unique position for the number in question) as you will use it throughout the puzzle solution. Every number you put into the puzzle should trigger another gimmie search in both the horizontal and vertical directions for the container in question.
OK, now where to we go? [Read more…] about Solving Sudoku Part 3