Example of a Forcing Chain: Let's say we have the following grid: 8 3 _ | _ 6 _ | _ 7 9 _ 2 _ | 7 _ _ | 5 _ _ _ 6 _ | _ _ _ | _ 1 _ --------------------- _ 9 _ | _ _ _ | _ 8 _ _ 5 _ | _ 3 _ | _ _ _ 2 _ _ | _ _ _ | _ 4 _ --------------------- In this grid, we can identify a single chain involving the numbers 1 and 7 in row 3: Cell R3C2 has candidates 1 and 7. world s hardest sudoku online
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For example, you might think of "Sue the cool dog" to remember the "SUE-doh-koo" sound. world s hardest sudoku online Steps to Solve a Forcing Chain: Identify the chain's starting point, which is a cell with a conditional candidate. squiggly sudoku printable
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