PlaySudoku.us
Expert · Puzzle #148
4
7
5
6
7
3
4
1
2
2
3
9
4
8
7
5
4
8
3
8
8
2
2
6
1
The hardest published Sudoku puzzle — graded by the number of search nodes a computer needs — was named 'Al Escargot' by its creator.
The hardest published Sudoku puzzle — graded by the number of search nodes a computer needs — was named 'Al Escargot' by its creator.
"The threat is stronger than the execution." — Aaron Nimzowitsch
"The threat is stronger than the execution." — Aaron Nimzowitsch