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Before starting
1. The singles
1.1. Naked single
1.2. Hidden single
2. Locked candidates
2.1. Segment 1
2.2. Segment 2
3. The subsets
3.1. Naked subsets
3.1.1. Naked pair
3.1.2. Triplet et quad
3.2. Hidden subsets
4. Complex methods
4.1. Associated pairs (X-wing)
4.2. Multiple associated pairs (Swordfish)
4.3. Linked candidates(coloring)
4.4. Forced chains
5. Guesswork/Nishio

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Solving methods > 5- Guesswork/Nishio

It ‘s sometimes not possible to progress in resolving a sudoku with one of the previous methods.
One must then arbitrarily choose a candidate of a cell and see what results from this choice.
If we end up in a dead end or an impossible situation, then one must revert to the initial arbitrary choice and try another selection.

This method leaves a large part to guesswork and should not normaly be used to resolve a sudoku.
The puzzles proposed by ‘sudoku129’ can all be resolved without guesswork.

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