Two-String Kite
Advanced Removes candidates Used in: Sudoku, Killer Sudoku
A row and a column each have a digit confined to two cells, and one end of each lands in the same box. The digit must then lie at one of the two free ends, so it can be removed from any cell that sees both of them.
How to spot it
A row-string and a column-string for one digit whose near ends share a single box.
What you can conclude
Eliminate the digit from the cell where the two far ends cross.
Worked example
A row’s two 4s and a column’s two 4s meet in one box; one of the two far ends must be 4, so 4 can be removed from any cell that sees both.