4. Eliminating Numbers from Rows, Columns and Boxes

There are more complex ways to find numbers by using the process of elimination.

In this example the 1 in Square c8 implies that either Square e7 or Square e9 must contain 1. Whichever the case may be, the 1 of Column e is in Box 8 and it is therefore not possible to have 1 in the centre column of Box 2.

So the only square left for 1 in Box 2 is Square d2.

 

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