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Puzzle 11/06/10: B XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Fri Jun 10, 2011 10:20 pm    Post subject: Puzzle 11/06/10: B XY Reply with quote

Code:
 +-----------------------+
 | 9 . . | . . 3 | 2 . 1 |
 | . 3 . | . . . | . . . |
 | . . 2 | . . . | . 3 . |
 |-------+-------+-------|
 | . . . | 1 . . | . . 7 |
 | . . . | . 6 7 | 1 9 . |
 | 7 . . | . 9 8 | . 2 3 |
 |-------+-------+-------|
 | 1 . . | . 2 . | 9 . . |
 | . . 4 | . 1 6 | . 5 2 |
 | 3 . . | 8 . 5 | . 1 . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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peterj



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

PostPosted: Sat Jun 11, 2011 9:14 am    Post subject: Reply with quote

The grid after basics looked like one enormous MUG! - but it seemed a tough puzzle with not many moves to play? Two steps but I look forward to seeing the "right" solution.
Quote:
m-wing(78) (8=7)r2c3 - r2c7=(7-8)r3c7=r3c5 ; r2c5<>8
skyscraper(4)[r23c1=r4c1 - r4c8=r1c8]=(4)r2c8 - (4=5)r2c5 - r1c5=r1c2 ; r1c2<>4
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sat Jun 11, 2011 3:22 pm    Post subject: Reply with quote

I agree with Peter, this was a very interesting puzzle; the grid after basics was somewhat different from the norm.

I have yet to study Peter's solution but I believe my two stepper is similar.

Quote:
(8=7)r2c3-r1c3=r1c4-(7=6)r3c4-als(6=45)r3c19-(45=8)r3c5; r2c5<>8
coloring 4

Ted
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peterj



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

PostPosted: Sat Jun 11, 2011 3:41 pm    Post subject: Reply with quote

Ted, I notice you have been using a lot of anp etc. recently Smile

In this one, I can't see a "colouring" move after the r2c5<>8 - I know it's hard to describe unless you noted an x-chain. I ask because I looked long and hard for some sort of fish/x-chain on 4s and the best I could do was an "almost"...

[Edit] Looked again - and I now see some colouring moves if you play an xyz-wing(56-4)! So I guess the straightforward path is xyz-wing, couple of turbot moves on 4 and an m-wing (or other wing). I am awful at spotting xyz-wings Sad
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sun Jun 12, 2011 1:50 pm    Post subject: Reply with quote

I reviewed my solution and am unable to determine what happened, except that I definitely messed up either basics or the coloring step.

Sorry about that..............

Ted
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