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Tough Sudoku for 19/March/2014

                 
                 
                 
                 
                 
                 
                 
                 
                 

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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19/Mar/14 1:23 AM
Kevin would be 9 now. Time flies eh Wagdy?
19/Mar/14 4:12 AM
i1=5 ; Colouring(1) from 1a46=1b9 or Starfish(1 Columns beh, 1Boxes b2h8 ) :=> -1a4689,i246 :
a12=c1-h1=XWing(he46)-b46=b9-gi9=i8 :=> -1a46,a89,i2
and
i89=g9-b9=XWing(be46)-h46=h1-ac1=a2 :=> -1i46,i2,a8
#1. Either h1=6->UP29; XWing(1he46)-1i5,bc46; C(S); OR h1=8->C(S); h1=1; UP81
19/Mar/14 4:19 AM
i1=5; UP24; Colouring(1) from 1a46=1b9 or Starfish(1 Columns beh, 1 Boxes b2h8 ) :=> -1a4689,i246 :
a12=c1-h1=XWing(he46)-b46=b9-gi9=i8 :=> -1a46,a89,i2
and
i89=g9-b9=XWing(be46)-h46=h1-ac1=a2 :=> -1i46,i2,a8

Wing[(59)c7,9ai8,1ic8]-5c8=5e8; More...
19/Mar/14 7:47 AM
i1=5
#1. b7=5 ?
UP30; LC(1gi2)-1h1=1h46-1gi456=1ac5-1ac456; UP37
XWing(8fh17)-8h346
Wing[(76)c3,(64)h3,(47)i2]-7g3=7i2; C(S)
:=> b7=9; UP31; LC(1ac8)-1ab9; UP81
19/Mar/14 11:38 AM
I found a way with i1=5 i2<>1 h1<>8 and g2<>1 but it was realy hard for me...
19/Mar/14 12:44 PM
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