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Radio times 18/20

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George Woods

Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

Posted: Sat Nov 24, 2007 10:28 pm Post subject: Radio times 18/20

Standard play get to this point

Code:

+---------------+------------+--------------+
| 7 3 5 | 2 4 9 | 16 18 68 |
| 469 46 49 | 3 1 8 | 27 27 5 |
| 8 1 2 | 5 6 7 | 4 9 3 |
+---------------+------------+--------------+
| 3 9 48 | 6 28 1 | 5 24 7 |
| 46 246 1 | 7 5 234 | 8 234 9 |
| 45 2458 7 | 9 238 234 | 23 6 1 |
+---------------+------------+--------------+
| 159 7 6 | 8 23 235 | 139 13 4 |
| 2 458 348 | 14 9 35 | 1367 1378 68 |
| 149 48 3489 | 14 7 6 | 139 5 2 |
+---------------+------------+--------------+

Play this puzzle online at the Daily Sudoku site

I could solve this by a chain of XY "hinge" at r6c7 - if 2 r4c8 is 4 and if 3 then r7c5 is 3 and via box 9 r7c1 is 5 and r6c1 is 4 So r4c3 cannot be 4

Solve/play finds the problem too hard. so is there a less barbaric way to solve this one?

TKiel

Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI

Posted: Sat Nov 24, 2007 11:49 pm Post subject:

Removal of locked candidates in box 7 reveals naked triple in r8. Singles after that.

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