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Trial & Error

Trial & Error is a solving technique of last resort. A digit is placed into a cell and the implications for this placement are examined. When a contradiction is found, the trial candidate is eliminated.

There are several techniques related to Trial & Error:

The trial candidates are restricted to constraints with only 2 candidates left.
Only candidates for a single digit are taken into consideration.
All candidates are examined this way without any prior selection.
When the placement leads to the solution, alternatives are not verified.
This page was last modified 23:24, 29 October 2006.