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A new puzzle.

 
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5iyubaobao



Joined: 02 Jan 2008
Posts: 9
Location: BeiJing China
PostPosted: Wed Jan 02, 2008 9:15 am    Post subject: A new puzzle. Reply with quote
Hi, all

Here is a new puzzle,

Code:

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


I think that it is very difficult, I can only find two digitals. The following is my rusult:

Code:

+----------------+-------------------+-------------------+
| 369   369  24  | 7    1249 1234    | 58     1249  58   |
| 57    57   1   | 8    249  24      | 6      249   3    |
| 39    8    24  | 5    6    1234    | 1249   7     19   |
+----------------+-------------------+-------------------+
| 5678  4    3   | 16   15   78      | 1789   169   2    |
| 2678  1    78  | 2346 24   9       | 378    5     68   |
| 25678 567  9   | 1236 125  78      | 1378   136   4    |
+----------------+-------------------+-------------------+
| 13    2    5   | 9    7    146     | 134    8     16   |
| 1789  79   78  | 124  3    12456   | 12459  12469 1569 |
| 4     39   6   | 12   8    125     | 12359  1239  7    |
+----------------+-------------------+-------------------+


I use the "Draw/Play" tool, which can solve the problem. The next digital that this tool find is 6 in row 7 and colume 9. I don't know why it is 6.

Could you help me? thank you.
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
PostPosted: Wed Jan 02, 2008 10:42 am    Post subject: Reply with quote
I think the computer intends you to use an xy-wing pivoted on r3c1 with pincers r3c9 and r7c1.

If this is unfamiliar, it is easy to understand though not always easy to find. Suppose the pivot, r3c1, contains 3: then r7c1 contains 1. On the other hand, if the pivot contains 9, r3c9 contains 1. Whichever applies, 1 can be eliminated from r7c9.

Steve
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5iyubaobao



Joined: 02 Jan 2008
Posts: 9
Location: BeiJing China
PostPosted: Thu Jan 03, 2008 12:46 am    Post subject: Reply with quote
Ok, with your help, I have solved this puzzle,

Thank you very much!
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