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SC: Single Cell

Look over all cells in a row, column or box. If you find a number which only exist in one cell, this number must be the solution for the cell. Here is a sudoku (which is solved as much as possible with IG and SiSo).

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

Here is the solution table this far. Notice the number 7 i R1C3. This is the only 7 in the whole R1. This means R1C3 must be 7.

3 1 79 45 6 45 59 2 8
4 2 79 158 1357 158 1359 6 135
8 6 5 12 123 9 4 7 13
125 48 6 12589 1259 7 1359 49 1235
9 7 123 125 4 125 135 8 6
125 48 12 3 1259 12568 7 49 125
12 9 8 7 125 125 6 3 4
126 3 12 1249 129 124 8 5 7
7 5 4 6 8 3 2 1 9

By continue using SiSo and SC you will be able to solve this sudoku.