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Extra info for How To Solve Every Sudoku Puzzle Vol 1, 2nd Ed.

Sample text

Let's assume one of the 2 possible values for any one of the unresolved cells. , and the Lower Column no. ) Let's assume the Value '2' in (2,3); so, let's delete '3' from Cell (2,3). This is what we have: 2 3 1 4 4 1 2,3 2,3 3 2 4 1 1 4 2,3 2,3 33 Solving Sudoku SAP Since cell (2,3) takes the value '2', we can't have any more '2' in row 2, or column 3 or the Top Right Major Square (consisting of cells (1,3), (1,4), (2,3) and (2,4)). So, delete '2' from all the above cells in the Possibility Matrix where the puzzle is yet to be solved.

In such a case, Cell (1,3) and Cell (4,3) can't take these values, '2' and '4'. So, remove '2' and '4' from these Cells. We call it 'Group Reduction'. 39 Solving Sudoku SAP Now, we have: 2,4 2,4 3 1 2,4 2,4 1 3 2,4 2,4 2,4 2,4 1 3 1,3 1,2,4 By the process of repeated reductions, we now get: 2,4 2,4 3 1 3 1 2,4 2,4 1 3 2,4 2,4 2,4 2,4 1 3 We can now apply the Tie Breaker Rule, and try to get the first solution: 2 4 3 1 3 1 2,4 2,4 1 3 2,4 2,4 4 2 1 3 We find that still 4 Cells remain unresolved.

6. Repeat Tie Breakers with other possible values to arrive at all possible Solutions, if required. 7. Declare the Problem as Unsolvable If Conflicts arise which are not resolvable. Very Simple and Simple Puzzles are solved by Stage 2. Moderately Difficult Puzzles are solved by Stage 3. Difficult Puzzles are solved by Stage 4. Very Difficult Puzzles (by whatever names different composers choose to call them) are solved by Stage 5 and beyond. 3 Some Sudoku SAP Puzzles… …to cut your teeth, before you learn to solve the original Sudoku Puzzles (of Order 3).