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Hard · Puzzle #511
9
3
2
5
6
8
5
3
1
2
8
9
7
1
3
8
6
2
1
4
9
2
8
5
4
1
9
5
4
"Mathematics takes us into the region of absolute necessity, to which not only the actual world, but every possible world, must conform." — Bertrand Russell
"Mathematics takes us into the region of absolute necessity, to which not only the actual world, but every possible world, must conform." — Bertrand Russell
When a row, column, and box all intersect, the intersection cell is the most constrained — always check it first.
When a row, column, and box all intersect, the intersection cell is the most constrained — always check it first.