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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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 Posted: Sat Jul 20, 2013 1:28 am Post subject: Vanhegan |
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| Code: |
+------------------+-------------+---------------+
| 4 68 2 | 358 1 9 | 367 3567 358 |
| 5 189 7 | 38 6 4 | 2 139 1389 |
| 13689 1689 1369 | 7 2 58 | 4 1569 1589 |
+------------------+-------------+---------------+
| 7 3 59 | 25 89 6 | 1 459 459 |
| 1269 12569 4 | 15 39 7 | 8 3569 359 |
| 1689 15689 1569 | 4 389 15 | 36 2 7 |
+------------------+-------------+---------------+
| 1369 14679 8 | 19 5 2 | 37 1347 134 |
| 1239 1279 139 | 189 4 138 | 5 1378 6 |
| 13 145 135 | 6 7 138 | 9 1348 2 |
+------------------+-------------+---------------+
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Play this puzzle online at the Daily Sudoku site
I've reached an invalidity twice and I wonder if I've erred in logic rather than the usual mechanical errors.
First move is a Fin Transport which I think is OK. Based on the 6s in r57 I think 6 can be eliminated from r1c2 after transporting 6 from r5c8 to r1c7.
I'm less confident about this move. Note the DP on 12 in r58c12. The 2 is an X-Wing. I treated each line as a Type 4 and removed 1 from all four cells. Is this where I went wrong? |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Jul 20, 2013 7:34 am Post subject: |
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Marty,
I think your DP X-wing reasoning is faulty.
Look at it this way: One of the two diagonals must be 2. Pick one.
If one of the remaining cells is 1, does it force 1 in the fourth cell of the X-wing? I think not, and eliminations of 1 in the DP cannot be made.
I believe Helmut's Sudoku Helper will tell you this is a valid puzzle. I presume it will also show that the solution includes 1 on one of the corners of the X-wing.
From a hotel in the suburbs of Toronto.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Jul 20, 2013 2:55 pm Post subject: |
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| Quote: | | If one of the remaining cells is 1, does it force 1 in the fourth cell of the X-wing? I think not, and eliminations of 1 in the DP cannot be made. |
Keith,
Thanks. What I did, cell by cell, was place 1 in the cell and saw that it led to a DP. I was looking at the trees, not the forest.
Marty |
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