Practise: Jellyfish
This verified teaching position begins directly with a real Jellyfish 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
Jellyfish are hard to find by eye. The practical approach is to work one digit at a time, list the candidate columns for every row, and look for four rows whose combined columns number exactly four. Most solvers only attempt this when a puzzle has resisted everything else.
Put it to use
Where you will meet it
Expert grids are the only place this pattern regularly decides the solve. Bring your notes.
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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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