Sudoku1 - Burma Method
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Solve Method "Burma"

For a comprehensive reading, please refer to Sudoku1 Grid definitions.

 

This method is based on the identification of possible cells for a given number and lets you delete possible.
A zone can be a row, column or block. For the selected zone, a complementary zone will be of different types.
General rule Burma:
If there are zones with only N or less possible cells for a certain number, if these cells are on
N complementary common zones and each complement zone has at least 2, the figure does not appear in another cell of the N complementary zones.

This method can be used for very complex grids, to unlock the problem.  It is selectable as Sudoku1 automatic solve methods in the Method panel by a click on Burma. You can then choose one or more values of N.

This method has simple counterparts, such as:
- X-wing with N = 2
Rule: If there are only two possible cells for a certain number in each of two different columns, and if these cells are on the same two lines, then any other cells in these two lines does not contain the number. Likewise for two lines and two columns together.

For N exactly equal to 2, this method is called Swordfish.

With the widespread: Instead of taking only columns and rows, it may also take Zones.
The rule is:
If there is only two possible cells for a certain number in each of two different zones of the same type, and if these cells are found in two other complementary zones, then any other cells in the last two zones does not contain the number.

- Swordfish for N = 3

- Jellyfish for N = 4

- Squirmbag for N = 5.

Here are some simple examples.

Example : X-Wing (N = 2). It displays the possible figure 1.

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The Number 1 can be cancelled in 4 cells. 
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