Sudoku for Nikolaus 2005

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A Nikolaus Sudoku Puzzle

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

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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