Sudoku Players' Forum (clone)

I was just wondering that what are the minimum numbers required to be given in a sudoku problem to ensure a unique solution.
I hope I'll get the answer soon
Thank You!!!!!!!1

You could have read the answer in many threads in the General/puzzle forum:
The minimum clue sudokus found so far have 17 clues or 18 for symmetric puzzles resp. It is not proved but very probable that no unique lower clue sudokus exist.

Wolfgang wrote:You could have read the answer in many threads in the General/puzzle forum:
The minimum clue sudokus found so far have 17 clues or 18 for symmetric puzzles resp. It is not proved but very probable that no unique lower clue sudokus exist.

i agree, the standard is that they should be symmetric so i say that it is 18

When looking for a 17 that has symmetry, one must remember there are many types of symmetry other common 2 fold rotation. See here. I don't know if a search for symmetrical 17's has been conducted using this broader restriction.

ah I had the same problem