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Asellus · Posted: Fri Nov 09, 2007 9:38 pm Post subject: Freep/LAT Nov 9

Another interesting puzzle:

Marty R. · Posted: Sat Nov 10, 2007 12:10 am Post subject:

This looked more intimidating than it turned out to be, what with a large number of polyvalue cells at the start. But it succumbed to a W-Wing, simple coloring and a Type 1 UR.

Johan · Joined: 25 Jun 2007 Posts: 206 Location: Bornem Belgium

I found a ER for digit <4> in Box 8, which eliminates <4> in R9C7,

collapsing the whole puzzle.

The grid after basic steps :

Marty R. · Posted: Sat Nov 10, 2007 1:16 am Post subject:

Johan · Joined: 25 Jun 2007 Posts: 206 Location: Bornem Belgium

Marty R. · Posted: Sat Nov 10, 2007 4:57 am Post subject:

Asellus · Posted: Sat Nov 10, 2007 5:53 am Post subject:

I didn't notice the ER because my first step was the Skyscraper in C48 that eliminates <4> from both R9C7 and R8C6. After that, I, too, needed the {13} UR.

I also didn't notice the {15} W-Wing. However, after the Skyscraper, that becomes a Type 6 UR with the same result, which is interesting.

There are also various XY Chain options along various paths.