1. Complete a row or column or box when only one cell is open and eight digits have been filled in already.
2. Write a digit in a box where it can go in only one place.
3. Write a digit in a row or column where it can go in only one place.
4. Fill a cell that allows only one digit.
For many (most?) newspaper puzzles no further techniques are required.
More detailed examples and explanation can be found on the following pages.
Remark For people grading puzzles: a puzzle becomes easier if some easy technique applies in several places, so that it is easier to find a place where it applies.
Remark No, naked singles are not the easiest - they are easy only when pencilmarks have been given.
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