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Mepham 6/17 help please

 
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lkmckin



Joined: 25 May 2007
Posts: 9

PostPosted: Thu Jul 19, 2007 11:34 pm    Post subject: Mepham 6/17 help please Reply with quote

Stuck at this point. Tired of staring at it. Please ease my mind.

Code:

+------------+----------------+------------+
| 2568 56 3  | 58   258   4   | 1 9    7   |
| 28   7  18 | 38   1289  139 | 5 4    6   |
| 45   9  14 | 7    15    6   | 3 8    2   |
+------------+----------------+------------+
| 13   24 7  | 3458 34589 359 | 6 1235 158 |
| 9    8  6  | 1    35    2   | 7 35   4   |
| 13   24 5  | 6    3478  37  | 9 123  18  |
+------------+----------------+------------+
| 56   1  9  | 2    36    8   | 4 7    35  |
| 478  3  48 | 45   1457  157 | 2 6    9   |
| 47   56 2  | 9    34567 357 | 8 15   135 |
+------------+----------------+------------+
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

PostPosted: Fri Jul 20, 2007 11:23 am    Post subject: Reply with quote

The 5 in row 8 must be placed in box 8; so 5 can be eliminated from r9c5 and r9c6. This discloses a pair (37) in column 6.

Allowing for the pair brings out an xy-wing pivoted on (19) in r2c6 which eliminates a couple of 5s and takes you home.

Steve
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lkmckin



Joined: 25 May 2007
Posts: 9

PostPosted: Fri Jul 20, 2007 3:47 pm    Post subject: Reply with quote

Thanks for the obvious solution I couldn't see. I finally got it through brute force (lots of xy chains), but of course, your solution was much better.
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