The New Sudoku Players' Forum

[Yogi]

.623148.7.3....2...7.2..4.3...9...3.6.1....42.......8.2..6..1.4....5.6.8.167.83..

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I was looking for skyscrapers & kites and found that the 59 chain running from r1c1 to r9c9 eliminates both these candidates from r9c1, leaving that cell solved at 4 stte.
Would you call this a Double X-chain since the same chain eliminated two candidates from the same cell?

[Leren]

That move can be viewed as Remote Pairs. There is an article about them here.

You could also view it as a double oddagon with a single Guardian 4 in r9c1, which must be True. Oddagons/Guardians is somewhat obscure and not often used move. There is an article about Guardians here.

Leren