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Daily Telegraph January 24, 2014 Diabolical

 
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Clement



Joined: 24 Apr 2006
Posts: 657
Location: Dar es Salaam Tanzania

PostPosted: Mon Jan 27, 2014 6:39 pm    Post subject: Daily Telegraph January 24, 2014 Diabolical Reply with quote

Interesting
Code:

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

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5127
Location: Rochester, NY, USA

PostPosted: Tue Jan 28, 2014 2:49 am    Post subject: Reply with quote

Interesting indeed. So interesting that I can't seem to make enough of a dent in it to do anything.

I played a W-Wing on 12 and a Type 1 UR on 29, and that's where things stand.
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Marty R.



Joined: 12 Feb 2006
Posts: 5127
Location: Rochester, NY, USA

PostPosted: Tue Jan 28, 2014 5:57 am    Post subject: Reply with quote

Finally got it with a five-stepper.

1) W-Wing on 12
2) Type 1 UR on 29
3) Coloring on 5
4) XYZ-Wing on 148
5) XY-Wing on 16-5
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Clement



Joined: 24 Apr 2006
Posts: 657
Location: Dar es Salaam Tanzania

PostPosted: Tue Jan 28, 2014 9:18 am    Post subject: Daily Telegraph January 24, 2014 Diabolical Reply with quote

Code:

+--------------+--------------+------------+
| 2     8  3   | 4    7   5   | 1  6   9   |
| d45    7  1   | 29   6   29  | 3  c45  8   |
| 9     6  e45  | 3    1   8   | 47 27  245 |
+--------------+--------------+------------+
| 167   3  2   | 17   9   4   | 5  8   16  |
| 158   15 9   | 6    258 3   | 47 27  124 |
| 15678 4  568 | 1278 258 12  | 9  3   126 |
+--------------+--------------+------------+
| 148   12 f48  | 5    3   6   | g28 9   7   |
| 3     25 7   | 1289 28  129 | 6  145 145 |
| 568   9  568 | a12   4   7   | h8-2 b15  3   |
+--------------+--------------+------------+
Interesting in that there are two XY Chains
The one which makes many eliminations does not solve it.
XY Chain: (1=2)r6c6-(2=9)r2c6-(9=2)r2c4-(2-1)r9c4; r46c4<>1, r8c6<>1 does not solve it.
XY Chain: (2=1)r9c4-(1=5)r9c8-(5=4)r2c8-(4=5)r2c1-(5=4)r3c3-(4=8)r7c3-(8=2)r7c7; r9c7<>2; stte.
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Marty R.



Joined: 12 Feb 2006
Posts: 5127
Location: Rochester, NY, USA

PostPosted: Tue Jan 28, 2014 10:57 am    Post subject: Reply with quote

I looked all over te place for chains with no success.

Note: the first chain is basically the W-Wing on 12 with SL 2 in c5.
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