PlaySudoku.us
Expert · Puzzle #718
2
8
5
3
2
1
7
9
1
9
5
4
6
7
1
9
8
3
6
7
1
4
8
2
9
The maximum number of givens in a Sudoku that still leaves the rest logically deducible (no trivial completion) can exceed 77.
The maximum number of givens in a Sudoku that still leaves the rest logically deducible (no trivial completion) can exceed 77.
Backtracking — the algorithm most computers use to solve Sudoku — is a form of depth-first search with pruning.
Backtracking — the algorithm most computers use to solve Sudoku — is a form of depth-first search with pruning.