Hi, I'm new, and I have a question about Sudoku.

I know that the least numbers needed to have one solution is 17, but what is the least amount of numbers to have 2 solutions? Or the most numbers to have 2 solutions?

3 posts
• Page **1** of **1**

Hi, I'm new, and I have a question about Sudoku.

I know that the least numbers needed to have one solution is 17, but what is the least amount of numbers to have 2 solutions? Or the most numbers to have 2 solutions?

I know that the least numbers needed to have one solution is 17, but what is the least amount of numbers to have 2 solutions? Or the most numbers to have 2 solutions?

- Sixteen
**Posts:**1**Joined:**24 February 2008

Hi Sixteen, welcome to the forum.

There is no certainty about 17, just a conjecture.

See here for the answers :

16 clues :

77 clues :

These 2 puzzles have 2 solutions.

JPF

There is no certainty about 17, just a conjecture.

See here for the answers :

16 clues :

- Code: Select all
`5 . 2 | . . . | 4 . .`

. . . | 7 1 . | . . 3

. . . | . . . | . . .

-------+-------+-------

. . . | . . 4 | 6 . .

. 7 . | 2 . . | . . .

. 1 . | . . . | . . .

-------+-------+-------

6 . . | . . 2 | . . .

. . . | . 3 . | . 1 .

4 . . | . . . | . . .

77 clues :

- Code: Select all
`1 5 9 | 2 8 6 | 4 7 3`

2 3 7 | 1 5 4 | 8 9 6

4 8 6 | 3 9 7 | 5 2 1

-------+-------+-------

9 1 2 | 8 4 3 | 7 6 5

3 4 5 | . . 9 | 1 8 2

6 7 8 | 5 2 1 | 3 4 9

-------+-------+-------

8 6 1 | 4 3 2 | 9 5 7

5 9 3 | . . 8 | 2 1 4

7 2 4 | 9 1 5 | 6 3 8

These 2 puzzles have 2 solutions.

JPF

- JPF
- 2017 Supporter
**Posts:**3753**Joined:**06 December 2005**Location:**Paris, France

3 posts
• Page **1** of **1**