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Any cells which have only one candidate can safely be assigned that value.
In the example above, the only value which is not in row 5 [2 1 5 9] and
column 5 [3 7 6] and box 5 [9 4] is 8.
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It is very important whenever a value is assigned to a cell,
that this value is also excluded as a candidate from all other blank cells sharing the same row, column and 3x3 box.
SuDoKu-Cracker does this automatically.
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Tip: Auto-solve all Naked Singles
Right-click on 
(Solve next step) and select 'Naked Single ...'
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