Difference between revisions of "X-Wing"
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Clearly, the same logic can be applied when 2 candidates for a given digit appear exactly twice in 2 columns and they are in the same 2 rows. Now the other candidates for that digit can be removed from these two rows. | Clearly, the same logic can be applied when 2 candidates for a given digit appear exactly twice in 2 columns and they are in the same 2 rows. Now the other candidates for that digit can be removed from these two rows. | ||
[[Category:Solving Techniques]] | |||
Latest revision as of 14:06, 30 October 2021
An X-Wing is a fish pattern involving 2 rows and 2 columns.
It is a single-digit solving technique that allows the player to eliminate candidates.
Example
Try to find an X-Wing; scroll down to see the Solution.
It is in rows 1 and 4.
Make sure that both rows each contain only 2 candidates of a given digit, and that these candidates are confined to two columns. In this example, the columns are 2 and 5.
Now we can eliminate the remaining candidates for that digit from these two columns.
A total of 9 candidates can be eliminated from these two columns.
How it works
When 2 rows each contain only 2 candidates for a given digit, and the candidates are located in the same two columns, you may eliminate all other candidates for that digit from these 2 columns.
Example. fish diagram:
There are 2 candidates in row 2 and in row 8, marked X. Both candidates are located in the same columns 2 and 8. All other candidates in these 2 columns, marked with a red asterisk, can be eliminated.
Clearly, the same logic can be applied when 2 candidates for a given digit appear exactly twice in 2 columns and they are in the same 2 rows. Now the other candidates for that digit can be removed from these two rows.
