Practise: Skyscraper
Follow one digit: find two matching strong links, then look at the two far roof cells.
The prepared notes contain two two-place lines for one digit. Find their shared base and the two roof cells; do not place a digit yet.
Example 1 of 4
Your turn first
Your turn first
Find the two lines in which 7 has exactly two notes. They share one base; their other notes are the roofs. Which note sees both roofs?
Remember
A Skyscraper has two strong links with one shared base. At least one roof must contain the digit, so any candidate seeing both roofs can be removed.
Put it to use
Where you will meet it
Hard grids are built around moves like this one. That is where it earns its keep.
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