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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Mar 08, 2011 7:16 pm Post subject: Puzzle 11/03/08: ~ Difficult |
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| Code: | +-----------------------+
| 1 . . | . 6 . | . . . |
| . 6 . | 1 . . | . 8 . |
| . . 9 | . 4 2 | 6 . . |
|-------+-------+-------|
| . 5 . | . 2 6 | . 1 3 |
| 2 . 3 | 8 1 . | . . . |
| . . 6 | 9 . 3 | . 2 . |
|-------+-------+-------|
| . . 1 | . . . | 7 . 4 |
| . 7 . | 2 . 1 | . . . |
| . . . | 7 . . | 1 . . |
+-----------------------+
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Mar 09, 2011 4:43 pm Post subject: |
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Unfortunately, I've been encountering more and more puzzles that I can't get going on. On this one I can make a couple of seemingly meaningless eliminations but can't see anything that will make a dent.
| Code: |
+-------------+------------+----------------+
| 1 34 57 | 35 6 8 | 2 3479 79 |
| 34 6 2 | 1 379 79 | 349 8 5 |
| 57 8 9 | 35 4 2 | 6 37 1 |
+-------------+------------+----------------+
| 789 5 78 | 4 2 6 | 89 1 3 |
| 2 49 3 | 8 1 57 | 459 45679 679 |
| 48 1 6 | 9 57 3 | 458 2 78 |
+-------------+------------+----------------+
| 3589 2 1 | 6 3589 59 | 7 359 4 |
| 3569 7 4 | 2 359 1 | 3589 3569 689 |
| 35689 39 58 | 7 3589 4 | 1 3569 2 |
+-------------+------------+----------------+
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Mar 09, 2011 6:11 pm Post subject: |
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| Marty, I think you are in xy-chain territory - there is a short-ish one starting (4=3)r1c2 in your grid. Don't know how effective it is. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Mar 09, 2011 8:08 pm Post subject: |
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I looked for XY-Chains until I got eye strain. And now that I know where to look, I still can't see one that starts in r1c2. Below is a slightly corrected grid which accounts for the 35 pair in box 2.
| Code: |
+-------------+------------+----------------+
| 1 34 57 | 35 6 8 | 2 3479 79 |
| 34 6 2 | 1 79 79 | 34 8 5 |
| 57 8 9 | 35 4 2 | 6 37 1 |
+-------------+------------+----------------+
| 789 5 78 | 4 2 6 | 89 1 3 |
| 2 49 3 | 8 1 57 | 459 45679 679 |
| 48 1 6 | 9 57 3 | 458 2 78 |
+-------------+------------+----------------+
| 3589 2 1 | 6 3589 59 | 7 359 4 |
| 3569 7 4 | 2 359 1 | 3589 3569 689 |
| 35689 39 58 | 7 3589 4 | 1 3569 2 |
+-------------+------------+----------------+
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Mar 09, 2011 8:20 pm Post subject: |
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This was the one I was looking at...
| Code: | | (4=3)r1c2 - (3=5)r1c4 - (5=7)r1c3 - (7=8)r4c3 - (8=4)r6c1 ; r2c1<>4, r5c2<>4 |
If you put an ALS hat on it looks like an xy-wing...
| Code: | | (435=7)r1c243 - (7=8)r4c3 - (8=4)r6c1 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Mar 09, 2011 10:45 pm Post subject: |
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Yikes, that must be the one chain that I didn't try. 
| Quote: | | Don't know how effective it is. |
Doesn't do much--except make it a one-stepper.  |
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