Mirrored from **Sudopedia**, the Free Sudoku Reference Guide

# Unavoidable Set

An **unavoidable set** is a Deadly Pattern from the point of view of a puzzle maker, or somebody who likes to investigate solution grids.

Take the following example:

If there were no givens in any of these 6 cells, the solver would eventually reach a point were a choice must be made how to place digits 1 and 2 in them. The conclusion would be that the puzzle has 2 possible solutions. It is *unavoidable for* the puzzle maker to place at least one given in one of these cells.

This page was last modified 11:18, 2 November 2006.