Sudoku for Nikolaus 2005

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A Nikolaus Sudoku Puzzle

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

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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