|2 String Kite
|A 2 string kite is a technique
that involves a single candidate (2 in thisexample) where:
Note: the yellow 2's are strongly linked in this example but this is not required. If they were weakly linked in box 2 (ie. there were three or more 2's in box #2) , the 2 string kite would still be valid. In that case it would be possible that both blue cells could be 2's.
(A 2 string kite is also an X Chain)
Here's another example: