Getting your head around the xz ALS rule

Everything about Sudoku that doesn't fit in one of the other sections

Getting your head around the xz ALS rule

Postby tonyjer » Mon Jan 08, 2007 8:30 pm

Hi Everyone

I know the rule but find it difficult to recognise and apply. (Strangely don't have probs with XYwing etc)

I know the rule is explained in the sticky section but I wondered if someone can direct me to some puzzles where it applies for me to cut my teeth so to speak.

Gracias y adios

Anna, Antonio y Edurdo Felipe
tonyjer
 
Posts: 25
Joined: 22 February 2006

Postby Mike Barker » Tue Jan 09, 2007 2:59 pm

Here are some from the local zoo. There are a number of others there where the xz-rule can be used. Check on the other links there as well.
Code: Select all
2.....9....8.49....1....78.79.1..85.....6.......9....282...3.....3.8..47.4.6..1.. #41.1
...6.5........468...3....51.7.38...242....3.....1..8...3..2..........9.67...56... #41.3~

#41 ALS xz-mutual exclusion rule
78..5.1..........9...8...5.57.......6...4...3..83...7132...7............1.596.... #41.7~
9.7..4......6..8.......9.2.......9....3....42.6...25...9.1..3.5.5...81..6......7. #41.6~
...2...8.6....5..9.5....3...2.......4..68..9.....7.5.4.1.96.8...9.....4.376...... #41.5~
..5.6..2....9..48..9...4......2.6..39.35...........91.5.2..81....6......3........ #41.4>
Mike Barker
 
Posts: 458
Joined: 22 January 2006

Many thanks Mike

Postby tonyjer » Tue Jan 09, 2007 8:28 pm

Thanks Mike

Will follow your advice
tonyjer
 
Posts: 25
Joined: 22 February 2006


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