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March 3, 2007

 
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AThiker



Joined: 01 May 2007
Posts: 6
Location: Taipei

PostPosted: Tue May 01, 2007 7:13 am    Post subject: March 3, 2007 Reply with quote

+-----------+-----------+-------------+
| 8 7 2 | 6 5 14 | 13 9 34 |
| 459 14 6 | 7 19 3 | 8 145 2 |
| 459 3 15 | 49 8 2 | 6 145 7 |
+-----------+-----------+-------------+
| 3 6 9 | 5 4 8 | 2 7 1 |
| 1 8 4 | 2 3 7 | 9 6 5 |
| 2 5 7 | 1 6 9 | 4 3 8 |
+-----------+-----------+-------------+
| 7 14 8 | 3 2 6 | 15 145 9 |
| 456 2 3 | 49 19 145 | 7 8 46 |
| 456 9 15 | 8 7 45 | 135 2 346 |
+-----------+-----------+-------------+

Any ideas or techniques to solve this one will be appreciated
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Angel



Joined: 26 Mar 2006
Posts: 31

PostPosted: Tue May 01, 2007 11:02 am    Post subject: Re: March 3, 2007 Reply with quote

Code:
+-----------+-----------+-------------+
| 8   7  2  | 6  5  14  | 13  9   34  |
| 459 14 6  | 7  19 3   | 8   145 2   |
| 459 3  15 | 49 8  2   | 6   145 7   |
+-----------+-----------+-------------+
| 3   6  9  | 5  4  8   | 2   7   1   |
| 1   8  4  | 2  3  7   | 9   6   5   |
| 2   5  7  | 1  6  9   | 4   3   8   |
+-----------+-----------+-------------+
| 7   14 8  | 3  2  6   | 15  145 9   |
| 456 2  3  | 49 19 145 | 7   8   46  |
| 456 9  15 | 8  7  45  | 135 2   346 |
+-----------+-----------+-------------+


The only places for a 5 in row 7 is in box 9, so eliminate 5 from r9c7.
So r7c7=5
Code:
+-----------+-----------+-------------+
| 8   7  2  | 6  5  14  | 13  9   34  |
| 459 14 6  | 7  19 3   | 8   145 2   |
| 459 3  15 | 49 8  2   | 6   145 7   |
+-----------+-----------+-------------+
| 3   6  9  | 5  4  8   | 2   7   1   |
| 1   8  4  | 2  3  7   | 9   6   5   |
| 2   5  7  | 1  6  9   | 4   3   8   |
+-----------+-----------+-------------+
| 7   14 8  | 3  2  6   | 5   14  9   |
| 456 2  3  | 49 19 145 | 7   8   46  |
| 456 9  15 | 8  7  45  | 13  2   346 |
+-----------+-----------+-------------+


xy-wing (r2c2, r2c5, r3c4) removes 4 from r3c1.
xy-wing (r7c2, r9c3, r9c6) removes 4 from r9c1
Code:
+-----------+-----------+-------------+
| 8   7  2  | 6  5  14  | 13  9   34  |
| 459 14 6  | 7  19 3   | 8   145 2   |
| 59  3  15 | 49 8  2   | 6   145 7   |
+-----------+-----------+-------------+
| 3   6  9  | 5  4  8   | 2   7   1   |
| 1   8  4  | 2  3  7   | 9   6   5   |
| 2   5  7  | 1  6  9   | 4   3   8   |
+-----------+-----------+-------------+
| 7   14 8  | 3  2  6   | 5   14  9   |
| 456 2  3  | 49 19 145 | 7   8   46  |
| 56  9  15 | 8  7  45  | 13  2   346 |
+-----------+-----------+-------------+


x-wing on 4s removes 4 from r8c6 and r8c9 (and places 6s in rows 8 and 9)
Code:
+-----------+-----------+-------------+
| 8   7  2  | 6  5  14  | 13  9   34  |
| 459 14 6  | 7  19 3   | 8   145 2   |
| 59  3  15 | 49 8  2   | 6   145 7   |
+-----------+-----------+-------------+
| 3   6  9  | 5  4  8   | 2   7   1   |
| 1   8  4  | 2  3  7   | 9   6   5   |
| 2   5  7  | 1  6  9   | 4   3   8   |
+-----------+-----------+-------------+
| 7   14 8  | 3  2  6   | 5   14  9   |
| 45  2  3  | 49 19 15  | 7   8   6   |
| 6   9  15 | 8  7  45  | 13  2   34  |
+-----------+-----------+-------------+


xy-wing (r3c4, r3c1, r8c1) removes 4 from r8c4.

That should leave a smooth finish.
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AThiker



Joined: 01 May 2007
Posts: 6
Location: Taipei

PostPosted: Tue May 01, 2007 1:35 pm    Post subject: Reply with quote

Thanks, I cannot believe I missed that 5. That is usually the 1st thing I look for. I guess an early rise for a crowed flight with crying babies breaks the concentration a bit. Guess I will save the very hard ones for quite time.
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