ed.  Alternatively, if the "what-if" exercises for both candidates imply an identical result, then that result is known.  The what-if approach requires a pencil and eraser or a good layout memory.There are three kind of conflicts, which can appear during puzzle solving:basic conflicts - there are only N-1 different candidates in N cell in the areafish conflicts - when eliminating number from N rows/columns, it will disappear also from N+1 columns/rows.unique conflicts - this pattern means multiple solutions, all numbers in the pattern exist exactly two times in every area, row and column. If there is only one candidate in the cell, any virtual candidate can be added.Encountering any of those would indicate that the puzzle is not uniquely solvable.  Encountering any of them as a consequence of "what-if" indicates that an untried alternative is correct.Computer solutions[සංස්කරණය]There are three general approaches taken in the creation of serious Sudoku-solving programs: human s