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.

PREVIOUS PAGE