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Set Q Puzzle 95

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Mar 11, 2009 4:22 pm    Post subject: Set Q Puzzle 95 Reply with quote
Code:
 +-----------------------+
 | . 1 . | . 3 . | . . 8 |
 | 7 . 4 | . 1 8 | . 2 3 |
 | . 8 . | . . 5 | . 4 . |
 |-------+-------+-------|
 | . . . | . . . | . . . |
 | 3 9 . | . 8 4 | . . 2 |
 | . 4 6 | . 2 9 | . . 1 |
 |-------+-------+-------|
 | . . . | . . . | . . . |
 | . 5 2 | . . . | . 3 . |
 | 8 3 . | . 4 2 | . . 5 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Thu Mar 12, 2009 12:37 am    Post subject: Reply with quote
Code:
.------------------.------------------.------------------.
| 2     1     5    | 4     3     67   | 79    679   8    |
| 7     6     4    | 9     1     8    | 5     2     3    |
| 9     8     3    | 2    C67    5    | 1     4    B67   |
:------------------+------------------+------------------:
| 1     2     8    | 3567  567   367  |J34    79   A479  |
| 3     9     7    | 1     8     4    | 6     5     2    |
| 5     4     6    |G37    2     9    |H38    78    1    |
:------------------+------------------+------------------:
|U46    7     19   | 3568  569   36   | 2     1689 U469  |
|U46    5     2    |F678  D679   1    | 48    3    U4679 |
| 8     3     19   |E67    4     2    | 79    1679  5    |
'------------------'------------------'------------------'

this one isn't so easy to see.

the UR {4,6} in r78c19 says that the 4 in A and the 6 in B can't both be false or the UR is forced to exist.
creates this strong inference UR46[(4)A = (6)B]..
can be greatly and almost insanely extended to this chain

UR46[(4)A = (6)B] - (6=7)C - (7)D = (7)EF - (7=3)G - (3)H = (3)J; J <> 4

I am very fond of these beauties.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sun Mar 15, 2009 4:06 pm    Post subject: Reply with quote
A more traditional solution is:
a kite on <7> with hinge in box2,
xy-wing<679> with pivot <69> in r1c8,
Type 1 UR<46> r78c19

Ted
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