The Negative Sudoku Dot System

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An overview of the strategy

1. Dot pre-existing or new values.
2. Find cells in which only one value is possible.
3. Find boxes in which only a single cell can contain a certain value.
4. Find rows in which all cells, where a certain value is possible, exist in the intersection of a single box and that row.
5. Find columns in which all cells, where a certain value is possible, exist in the intersection of a single box and that column.
6. Repeat steps one through five until no more values can be determined.
7. Use advanced strategies to determine another value.
8. Repeat all steps.