X-Wing not very common?
X-Wing not very common?
I finally got myself up to X-Wings in difficulty of technique, but I don't see them very often, at least not ones that cause any digit eliminations. Are they quite rare? Or are the puzzles I'm working on just too easy to see very many of them? (I've been working my way through Ruud's specialty puzzles, but I'm a slow puzzle-solver.)
The Daily Sudoku "very hard" puzzles require (at most) X-wing, XY-wing or XYZ-wing techniques.
http://www.dailysudoku.com/sudoku/
So, X-wings are fairly common in these puzzles.
Keith
http://www.dailysudoku.com/sudoku/
So, X-wings are fairly common in these puzzles.
Keith