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Puzzle 10/08/03: B

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Aug 03, 2010 4:23 pm    Post subject: Puzzle 10/08/03: B Reply with quote
Code:
 +-----------------------+
 | 1 . 4 | . . . | . . . |
 | . 2 . | . 6 . | . 3 . |
 | . . 8 | . . 4 | . . 7 |
 |-------+-------+-------|
 | . . . | . . 2 | . 9 . |
 | . 3 . | . 9 . | . . 2 |
 | . . . | 6 . 5 | . . . |
 |-------+-------+-------|
 | . . . | . . . | 6 7 . |
 | . 8 . | 3 . . | 2 . 4 |
 | . 9 1 | . 2 . | . . . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Rating wrote:
VH
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Tue Aug 03, 2010 7:58 pm    Post subject: Reply with quote
Quote:
Grouped Skyscraper on 1 => r46c5 is not 1
Empty Rectangle on 5 => r7c2 is not 5
XYWing (38-1), pivot at (38)R6C9 => r3c7 is not 1

The 2 Fishes may be replaced by the XY-Chain (total number of SIS unchanged):
(54)R7C2 (47)R9C1 (75)R2C1 (56)R3C2 => r3c2<>5

[edit] corrected Kite into Skyscraper in 1st move; revisited, this 1st move is superfluous, so disqualifying the XY Chain
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Aug 05, 2010 1:00 am    Post subject: Reply with quote
I probably screwed up since I did it with only an XY-Wing (475).
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Aug 05, 2010 1:42 am    Post subject: Reply with quote
Marty R. wrote:
I probably screwed up since I did it with only an XY-Wing (475).

My solver thinks you needed one more XY-Wing -- the one JC found.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Aug 05, 2010 3:34 am    Post subject: Reply with quote
My next time around was:

XY-Wing (475)
W-Wing (58) + pincer transports
XY-Wing (358)
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Thu Aug 05, 2010 8:08 pm    Post subject: Reply with quote
Two Steps:

1.Colouring on 5s; r7c2<>5
2.XY Wing <138> vertex at r4c7; r4c9<>1
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