Solution Method C

Solution Method C is aimed at the elimination of options. The effective solution is only by solving method A.
This solution method has 3 variants.

Solution Method C1 ("Naked Pairs - by Row")

Look row by row or a group of two cells that contain only two options.
If such a "chain" exists, then those cells that contain two numbers.
These two options can be removed from other cells in the row.

For example:
In the puzzle, the cells C2 and I2 together only options 2 and 6. These two cells will always contain the numbers 2 and 6.
This allows the options 2 and 6 are removed from the other cells in this row (in this example may be removed from the 6 cell D2).

Solution Method C2 ("Naked Pairs - by Column")

View column for a column or a group of two cells that contain only two options.
If such a "chain" exists, then those cells that contain two numbers.
These two options can be removed from other cells in the column.

For example:
In the puzzle, the cells B1 and B7 together only options 2 and 6. These two cells will always contain the numbers 2 and 6.
This allows the options 2 and 6 are removed from the other cells in this column (in this example may be removed from the 6 cell B6).

Solution Method C3 ("Naked Pairs - by Block")

Check block for block or a group of two cells that contain only two options.
If such a "chain" exists, then those cells that contain two numbers.
These two options can be removed from other cells in this block.

For example:
In the puzzle, the cells G1 and I3 together only options 7 and 8. These two cells will always contain the numbers 7 and 8.
This allows the options 7 and 8 are removed from the other cells in this block (in this example, 7 and 8 are removed from cell I2 which is the 8 should be completed).

Naked Triples / Quads Naked

The above solution methods are repeated for 3 options ("Naked Triples") and 4 options ("Naked Quads").

Naked Triples For example:
In the puzzle are the cells D7 + E7 + F7 a chain together with the numbers 2 and 3 and 8. These numbers can be removed from the cell (s) in this row (C7 + G7)

Naked Quads For example:
In the puzzle, the cells G1, H1, I1 and I3 only the numbers 1, 3, 5 and 7 contain.
As these numbers can be removed from the other cells in this block (G2, G3, H2, H3)