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Tough Sudoku for 5/July/2013

                 
                 
                 
                 
                 
                 
                 
                 
                 

Choose a number, and place it in the grid above.

  1 2 3 4 5 6 7 8 9
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Submitted by: Gath

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And 'pretty in pink' they are, too!
05/Jul/13 12:08 AM
SE 8.4
SSTS to UP28.
1) kraken cell (156)b2 => a1<>1,gi1<>4; UP31.
(1)b2-g2=g1
||
(5)b2-(5=4)h2-e2=(4-7)e1=a1
||
(6)b2-(6=9)b7-b3=(9-3)c3=(3-7)a2=a1-(7=4)e1
2) (7)i9=(7-5)i5=i4-d4=d3-(5=8)h3-(8=HP(26))i13 => i9<>27;UP81.
05/Jul/13 1:00 AM
Sorry, I dropped a portion of the first leg of the kraken in copying from my notepad. The correct kraken is
1) kraken cell (156)b2 => a1<>1,gi1<>4; UP31.
(1)b2-g2=(1-2)g1=i1
||
(5)b2-(5=4)h2-e2=(4-7)e1=a1
||
(6)b2-(6=9)b7-b3=(9-3)c3=(3-7)a2=a1 -(7=4)e1
05/Jul/13 1:04 AM
Love that pink! Have a great day, everyone.
05/Jul/13 1:06 AM
Another typo!
Apologies. Not enough caffeine and too much work. The last step's conclusion is i9<>26, not i9<>27. Here is the correct step:
2) (7)i9=(7-5)i5=i4-d4=d3-(5=8)h3-(8=HP(26))i13 => i9<>26;UP81.
05/Jul/13 1:28 AM
#1. LC and Subsets; UP28
#2. h7=4->UP35; Chain[4] : (1=2)b8-2h8=2i9-(2=4)i1-(4=1)g2 :=> b2=6; Contradiction(Singles) :=> h7=8; UP81
05/Jul/13 2:11 AM
So vibrant and pink!
05/Jul/13 3:03 AM
Dahlias I think.
05/Jul/13 2:42 PM
(27) 69@ab7=>d7<>6
(29) 48@gh7=>[g7<>69&h7<>9=>279@h589=>h5<>5=>5@h23=>i3<>5]
i9=6=>i3=8=>h3=5=>[h2=4&d4=5=>i4=2]=>i1={}=>i9<>6
(31) More...
05/Jul/13 5:48 PM
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