Sudoku for Nikolaus 2005

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A Nikolaus Sudoku Puzzle

5
3
1
9
4
9 3
6
4
7
2
9
7
1
4
6 9
8
6
1
5
2 4

How many possibilities are there to add one symbol such that the board becomes a (uniquely solvable) Sudoku puzzle?

Number:

To prove that you have not just guessed the number, also give three of the possibilities (or all possibilities, if there are less than three):
Row: Column: Symbol:
Row: Column: Symbol:
Row: Column: Symbol:

Questions and suggestions to Frank.Luebeck@Math.RWTH-Aachen.De.

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