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Techniques
XWing
If two rows have a candidate in exactly two cells that lie on the same two columns, then the candidate can be eliminated from all other cells in the those columns.
Consider the Sudoku below.
1
1
1
1
1
2
3
1
1
1
1
1
1
1
1
1
1
8
9
1
1
In
rows 2 and 8
, the candidate 1 exists twice in each row and lies in
exactly 2 columns
. The candidate 1 must exist in either
the topleft and bottomright cells
or
the topright and bottomleft cells
. In either case, we can eliminate the candidate 1 from
all other cells in columns 2 and 6
.
Note: You can swap columns and rows when performing this technique.
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Last Updated: 10/16/2018 10:06:08 AM CST