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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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 Posted: Tue May 17, 2016 3:46 pm Post subject: 17 May Hard |
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This puzzle is solved in move 1 (changes from Hard to Easy) by using the xy wing 567 so r9c1 is 6.
Oh Dear we shouldn't be using XY wings for HARD but how can we ignore them? |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue May 17, 2016 6:19 pm Post subject: |
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Agree, we shouldn't use wings on Hard. But none are needed on this puzzle.
Start off with the pair in b7. This grid is from Draw/Play after Auto sweep.
| Code: |
+------------------+-----------------+-----------------+
| 4 3579 579 | 157 6 8 | 2 357 57 |
| 3567 8 1 | 257 259 2379 | 59 3567 4 |
| 3567 35679 25679 | 257 4 2379 | 589 3567 1 |
+------------------+-----------------+-----------------+
| 57 157 3 | 1247 12 1247 | 6 8 9 |
| 678 167 67 | 3 1289 5 | 14 1247 27 |
| 9 2 4 | 1678 18 167 | 3 157 57 |
+------------------+-----------------+-----------------+
| 2 45679 5679 | 14568 3 146 | 1458 1456 568 |
| 1 3456 56 | 24568 258 246 | 7 9 2568 |
| 56 456 8 | 9 7 1246 | 145 12456 3 |
+------------------+-----------------+-----------------+
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Play this puzzle online at the Daily Sudoku site |
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