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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun Aug 07, 2011 5:20 pm Post subject: Puzzle 11/08/07: B XY (difficult?) |
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| Code: | +-----------------------+
| 9 . . | . 5 1 | . 3 . |
| . . . | 7 . . | . 2 9 |
| . . . | 9 . 6 | 1 . 7 |
|-------+-------+-------|
| . 1 4 | . . 2 | . . . |
| 7 . . | . 4 . | . . . |
| 8 . 2 | 5 . 9 | . . 1 |
|-------+-------+-------|
| . . 1 | . . . | . . . |
| 4 7 . | . . . | . 1 . |
| . 3 9 | . . 5 | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Mon Aug 08, 2011 7:41 am Post subject: |
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This puzzle seemed to have so many possible moves which turn out not very useful! The first wing does damage but the remaining grid still needed work.
| Code: | xy-wing(58-3) r8c3, r5c3, r8c6 ; r5c6<>3
xy-chain-als (8=5)r8c3 - (5=8)r3c3 - (8=5)r3c8 - (56=9)r57c8 - (9=8)r7c5 ; r7c2<>8, r8c5<>8 |
(I will also post in plain text from now on) |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Aug 08, 2011 3:15 pm Post subject: |
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| peterj wrote: | | (I will also post in plain text from now on) |
I've noticed your plain text posts already. THANKS!!!
BTW: my solver used a mix of steps before finishing with a 6-cell XY-Chain. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Aug 08, 2011 10:49 pm Post subject: |
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| Quote: | | This puzzle seemed to have so many possible moves which turn out not very useful! |
Those are the ones I used!!
I hacked away at it with eight mildly useful moves until the grid was reduced to a BUG+2. |
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