Practise: Pointing Pair
Look only at the marked box. Where can the 1 still go inside it?
In the marked box, the 1 has only two homes on one line. Follow that line outside the box; do not place a digit yet.
Example 1 of 4
Your turn first
Where does the line get its 1?
Look only at the marked box. Find the two possible homes for 1. If they share one row or column, remove 1 from the rest of that line outside the box.
Remember
Pointing Pair is simple: if a digit has all of its homes in one box on one row or column, erase that digit from the rest of this line outside the box.
Put it to use
Where you will meet it
Medium grids are where this move starts to matter: the obvious cells run out and the pattern takes over.
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