Nikolaus Home Registration Participants Program Sudoku Photos

Sudoku for Nikolaus 2005

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A Nikolaus Sudoku Puzzle

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

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