Practise: Skyscraper
This verified teaching position begins directly with a real Skyscraper pattern. Follow the chain, inspect the candidates and make the deduction before you continue.
You are at the verified key position. Use a hint to follow the chain link by link when you need support.
How to spot it
Find two rows where the digit has exactly two candidates each, with one candidate column shared. The two unshared cells are the tops. Then look for cells that share a unit with both tops — usually where their rows and boxes intersect — and remove the digit there.
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.
Play HardStuck on a grid of your own?
Type the position into the solver and it walks the whole solution, naming the technique behind every step — including this one.
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