Strategy Detailed Descriptions Strategy Detailed Descriptions Same as the previous strategy Intersecting groups with an additional row or column excluded, but finding more rows or columns to eliminate where the following situation exists:
In the example above, note that because the 4 in the last column eliminates a 4 in the first row of the third box, neither the first nor second row of the third box can contain a 4, so the third row must contain a 4. Therefore, neither the second nor third row of the first box can contain a 4. This means that the only available cell * in the first row of the first box must be a 4.