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Playing Fair at Sudoku

Joshua Cooper
USC Department of Mathematics

Rules: Place the numbers 1 through 9 in the 81 boxes, but do not let any number appear
twice in any row, column, or 3 3 “box”.
You start with a subset of the cells labeled, and try to finish it.
1

6

5

4

3

9

7

2

8

7

8

3

2

6

1

4

5

9

9

2

4

8

5

7

6

1

3

4

7

9

5

2

8

1

3

6

3

1

2

9

4

6

5

8

7

6

5