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Tough Sudoku for 6/October/2012

                 
                 
                 
                 
                 
                 
                 
                 
                 

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: sudoku lover

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Now, that's a red-head!
06/Oct/12 12:12 AM
Is that some kind of cardinal? Gorgeous shot!
06/Oct/12 12:37 AM
I think this is the first time I have had a photo appear in the puzzles first, they are usually in Jigsaws first.
06/Oct/12 2:02 AM
Got so excited about being here forgot to name the bird, a red crested cardinal I took the photo in Hawaii.
06/Oct/12 2:03 AM
1. Note ai9=18.Unique possibilities to 32.
2. Whether c1=9,c4=5;OR a1=9,e1=7,f2=5;c2=68.
3. If c2=6,c8=8,a9=1=b5,b6=6,b3=8=d2,i6=9=g3,i7=4=b1=h2=g5;the 67 rectangle at hi35 cannot be resolved.So c2=8.UP35.
4. Whether c4=5,c7=3;OR c4=9=a1,e1=7,e9=3;e7=4.UP36.
5. Whether e5=1=b8;OR e5=2=h4,h9=3,e9=7=a1,c1=9c4=5,c7=3;b8=1.UP45.
6. Whether h3=7,i3=9=a1,e1=7;OR h3=4=a4=d2,d1=3;e8=3.UP81.
06/Oct/12 7:51 AM
Should read:
6. Whether h3=7,i3=9=c4=a1,e1=7; ..............
06/Oct/12 8:28 AM
Strong digits 18 ...

#1. LC and LS up to UP32
#2. +1a9->UP40+[2or4]d8-> contradiction; UP45; ghi3=479
#3. Chain[4] : 2g5=2g8-(2=3)d8-(3=4)d1-4b1=4b5 :=> -4g5; UP81
06/Oct/12 4:24 PM
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