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Puzzle 11/03/06: ~ Difficult+

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Mar 06, 2011 8:31 pm    Post subject: Puzzle 11/03/06: ~ Difficult+ Reply with quote
Code:
 +-----------------------+
 | 6 . 2 | . 7 4 | . . 5 |
 | . 7 . | . . 2 | . . . |
 | 5 . 3 | 9 . 8 | 2 . 7 |
 |-------+-------+-------|
 | . . 5 | . 8 9 | . . . |
 | 4 . . | 5 . . | 8 2 9 |
 | 2 8 9 | 4 . 7 | . . . |
 |-------+-------+-------|
 | . . 6 | . 2 . | . . 8 |
 | . . . | . 4 . | . 5 . |
 | 8 . 4 | . 9 . | 7 . . |
 +-----------------------+

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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Mon Mar 07, 2011 3:00 pm    Post subject: Reply with quote
I used three different types of chain to crack this one... x, xy and AIC!
Quote:
x-wing(9) r1, r8 ; r2c7<>9, r7c27<>9
x-chain(1) (1)r3c8=r3c5 - r12c4=r9c4 - r7c6=r7c8 ; r12c7<>1, r9c8<>1
AIC (1=3)r1c4-(3=9)r1c7-(9=4)r2c8 - r7c8=(4-1)r7c7=r7c6 ; r9c4<>1
xy-chain ; (1=3)r4c1 - (3=9)r7c1 - (9=4)r7c8 - (4=1)r7c7 ; r4c7<>1
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Mar 07, 2011 11:51 pm    Post subject: Reply with quote
X-Wing (9)
AIC; r9c8<>1
M-Wing (16), flightless with transport; r9c8<>6
AIC; r1c7<>1, plus extension, r4c7<>1
Multi-coloring; r7c6<>1
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