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Set H Puzzle 9

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Fri Dec 26, 2008 10:00 pm    Post subject: Set H Puzzle 9 Reply with quote

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

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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sun Dec 28, 2008 12:03 am    Post subject: Reply with quote

I had a couple of moves that provided deletions that were not necessary for a two-step solution.

Quote:
ER <2> with strong link in c2 that deleted <2> in r5c7 and opened up
One of Keith's Extended xy-wings <239> with pivot <39> at r2c1 and pseudo-cell <23> in r67c1 that deletes <2> in r7c3

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5061
Location: Rochester, NY, USA

PostPosted: Sun Dec 28, 2008 2:08 am    Post subject: Reply with quote

I used the ER on 2, a W-Wing on 13 and a W-Wing with pincer transport on 28.
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Marty R.



Joined: 12 Feb 2006
Posts: 5061
Location: Rochester, NY, USA

PostPosted: Sun Dec 28, 2008 6:27 pm    Post subject: Reply with quote

Ted,

Not exactly a shocking development when I have trouble grasping a concept, but I'm having problems learning the pseudo cell concept. In this instance, I can see how the 2 is eliminated from r7c3 via a forcing chain, but I can't see how it gets eliminated via an XY-Wing with pincers.

Code:

+------------+--------+----------+
| 5   4  29  | 6 89 3 | 28  1 7  |
| 39  38 7   | 2 89 1 | 5   4 6  |
| 1   28 6   | 7 5  4 | 9   3 28 |
+------------+--------+----------+
| 7   5  18  | 3 2  9 | 18  6 4  |
| 239 23 129 | 4 6  8 | 13  7 5  |
| 38  6  4   | 1 7  5 | 238 9 28 |
+------------+--------+----------+
| 28  7  28  | 9 3  6 | 4   5 1  |
| 4   9  5   | 8 1  7 | 6   2 3  |
| 6   1  3   | 5 4  2 | 7   8 9  |
+------------+--------+----------+

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