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Tough Sudoku for 3/December/2017

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Submitted by: basscom4life
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cenoman  From France
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Basics to 25
1. (3=4)c7-a7=(4-9)a4=(9)a9 =>-3a9
2. (3=4)c7-a7=(4-3)a4=(3)b456 =>-3b89; basics to 81
03/Dec/17 1:46 AM
rwm  From New Mexico USA
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Basics to UP = 25
1. (3=4)c7 - c1 = b1 - (4=13*5)b456 - (5)b89 = HP(59)ca9 => -3*b89, - 3a9 ; uP = 81
03/Dec/17 2:29 AM
jacalmi  From Canada
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This coral does look like a brain. Kate.
03/Dec/17 5:20 AM
Alfred  From Sydney    Supporting Member
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cenoman's and rwm's neat solution in English:

Whether a7=3;OR a7=4=a4,a9=9,b456=3;locked 3 @ ac7.UP81.
03/Dec/17 8:01 AM
Nick  From Toronto
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24:00
04/Dec/17 1:54 AM
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