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Puzzle NR_061

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Jul 18, 2009 5:08 pm Post subject: Puzzle NR_061

XYZ-Wing alert

Code:

+-----------------------+
| 3 . 7 | . . 1 | . . . |
| . . . | . . . | . 6 . |
| 9 . 6 | . 2 . | . 5 8 |
|-------+-------+-------|
| . . . | 9 . 2 | 8 . . |
| . . 3 | . 8 . | . . . |
| 8 . . | 6 . . | . 2 . |
|-------+-------+-------|
| . . . | 2 . . | 5 4 . |
| . 2 5 | . . 4 | 3 . . |
| . . 4 | . . . | . . . |
+-----------------------+

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tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Mon Jul 20, 2009 2:36 am Post subject:

Two steps, but no xyz-wing.

Quote:

xy-wing 45-7 with pivot 45 in r4c1,
xy-wing 57-1 with pivot 57 in r5c6 and pseudo-cell 15 in box5.

Ted

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Jul 20, 2009 1:54 pm Post subject:

tlanglet wrote:

Two steps, but no xyz-wing.

Chains -- including XY-Chains and XY-Wings w/pseudo-cells -- subsume lesser techniques like XYZ-Wings. My alert was for those who don't normally find chains or advanced URs.

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