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Puzzle 11/08/07: B XY (difficult?)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Aug 07, 2011 5:20 pm    Post subject: Puzzle 11/08/07: B XY (difficult?) Reply with quote

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 | . . . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Mon Aug 08, 2011 7:41 am    Post subject: Reply with quote

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: 3855

PostPosted: Mon Aug 08, 2011 3:15 pm    Post subject: Reply with quote

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: 5061
Location: Rochester, NY, USA

PostPosted: Mon Aug 08, 2011 10:49 pm    Post subject: Reply with quote

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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