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Puzzle 11/02/04

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Feb 04, 2011 5:08 pm    Post subject: Puzzle 11/02/04 Reply with quote
Code:
 +-----------------------+
 | . . . | . . . | . 9 2 |
 | . . . | 7 . . | 3 8 . |
 | . . . | . . 9 | . . . |
 |-------+-------+-------|
 | . 2 . | 8 . . | 7 4 . |
 | . . . | . 2 . | . 6 . |
 | . . 4 | . . 3 | 9 2 8 |
 |-------+-------+-------|
 | . 9 . | 3 . 8 | 2 7 . |
 | 7 5 . | 1 6 2 | 4 . . |
 | 3 . . | . . 7 | . . . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Feb 05, 2011 1:12 am    Post subject: Reply with quote
Quote:
Type 1 UR (38), perhaps not needed
Kite (6); r6c2<>6
Type 3 UR (15-15-156-159), the 6 forces a 9; r9c5<>9
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sat Feb 05, 2011 9:36 am    Post subject: Reply with quote
You know how you can get completely carried away chasing down a DP...

Code:
 *----------------------------------------------------*
 | 58    378  357  | 46   38   *16+4 |*16   9    2    |
 | 2    *16   9    | 7   *15   *165  | 3    8    4    |
 | 4     38  *16   | 2    38    9    |*16   5    7    |
 |-----------------+-----------------+----------------|
 | 569   2    35   | 8   *15+9 *15+6 | 7    4    13   |
 | 89    378  37   | 49   2     14   | 5    6    3-1  |
 |*16+5 *16   4    | 56   7     3    | 9    2    8    |
 |-----------------+-----------------+----------------|
 |*16    9   *16   | 3    4     8    | 2    7    5    |
 | 7     5    8    | 1    6     2    | 4    3    9    |
 | 3     4    2    | 59   59    7    | 8    1    6    |
 *----------------------------------------------------*

10-cell ADP(16) overlapping with UR(15) => MUG(156) ?
ADP(156) (5)r6c1, (4)r1c6, (9)r4c5, (6)r4c6 ; r5c9<>1
(5)r6c1 - (5=3)r4c3 - (3=1)r4c9
||
(4)r1c6 - r1c4=r5c4 - (4=1)r5c6
||
(9)r4c5 - (9=4)r5c4 - (4=1)r5c6
||
(6)r4c6 - (6=5)r6c4 - (5=9)r8c4 - (9=4)r5c4 - (4=1)r5c6

Cracks the puzzle!

[Edit] Doh! There's an AIC that makes the same elimination - but the DP was big and fun!
Code:
(1=3)r4c9 - (3=5)r4c3 - als(5=16)r6c12 - (6=5)r6c4 - (5=9)r9c4 - (9=4)r5c4 - (4=1)r5c6 ; r4c56<>1, r5c9<>1
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