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Mar 1 VH

 
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kuskey



Joined: 10 Dec 2008
Posts: 127
Location: Pembroke, NH

PostPosted: Tue Mar 01, 2011 5:34 am    Post subject: Mar 1 VH Reply with quote

Using the techniques I'm most comfortable with I couldn't find a 1-stepper. However, there is some delayed action with several 2-steppers. After a 356 XY-Wing with pivot at r7c9 setting r56c7<>3, take your choice of either:
1. BUG+1
2. 135 XY-Wing pivot at r3c7 setting r7c1<>5
3. W-Wing on13 in c27 SL in 3 at r9 setting r2c8 and r7c1<>1
4. W-Wing on 35 in c12 SL in 3 at c7 setting r7c1<>5
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Marty R.



Joined: 12 Feb 2006
Posts: 5175
Location: Rochester, NY, USA

PostPosted: Tue Mar 01, 2011 5:49 am    Post subject: Reply with quote

I missed the XY-Wing, but there were a couple of interesting moves.

Code:

+-------------+---------+-----------+
| 58  7    68 | 3  56 1 | 2   9  4  |
| 9   1356 4  | 2  56 7 | 8   13 35 |
| 35  135  2  | 4  9  8 | 135 6  7  |
+-------------+---------+-----------+
| 2   9    5  | 1  3  6 | 7   4  8  |
| 1   8    37 | 79 2  4 | 369 5  36 |
| 6   4    37 | 79 8  5 | 39  2  1  |
+-------------+---------+-----------+
| 57  2    9  | 8  4  3 | 156 17 56 |
| 378 36   68 | 5  1  2 | 4   37 9  |
| 4   35   1  | 6  7  9 | 35  8  2  |
+-------------+---------+-----------+

Play this puzzle online at the Daily Sudoku site

In the DP 37-79-39 in boxes 456, r5c7 must=6 to kill the DP. After that use a BUG+1 or W-Wing (35).

Or note the overlapping Finned X-Wings on 35 in rows 39; r2c2<>35. That exposes an XY-Wing (163).
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