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Earl



Joined: 30 May 2007
Posts: 546
Location: St Louis MO

PostPosted: Thu Jun 28, 2007 6:33 pm    Post subject: Help ! Reply with quote

"Hint" says that R5C7 is 8. Why?

Thanks

Earl

Code:

+----------------+------------+--------------+
| 7    134   5   | 8  146  2  | 9    136 134 |
| 1368 1348  34  | 5  146  9  | 346  2   7   |
| 16   9     2   | 3  7    46 | 5    8   14  |
+----------------+------------+--------------+
| 389  5     39  | 2  48   34 | 1    7   6   |
| 4    368   7   | 1  9    36 | 38   5   2   |
| 2    368   1   | 7  68   5  | 34   9   348 |
+----------------+------------+--------------+
| 15   2     6   | 9  3    8  | 7    4   15  |
| 359  7     349 | 46 25   1  | 2368 36  358 |
| 135  134   8   | 46 25   7  | 236  136 9   |
+----------------+------------+--------------+

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Steve R



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

PostPosted: Thu Jun 28, 2007 7:59 pm    Post subject: Reply with quote

Because you can eliminate 8 from r6c9 using the xy-wing for (36) pivoted on r5c6 with pincers r5c7 and r6c5.

Steve
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