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Tough Sudoku for 30/June/2018

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Submitted by: Gath

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Did, did, did, and now done.
30/Jun/18 12:57 AM
1)UP 26.
2)Locked 8s at ab8 forbid ehi8 = 8. UP 30.
3)Naked pair 67 at af1 forbids ch1=6, bcdh1 = 7.
4)d5 = 7 == d3 = 7 – f1 = 7 == a1 = 7 forbids a5 = 7. UP 31.
5)Locked 3s at df9 forbid gh9=3.
6)Locked 6s at gh2 forbid g3=6.
7)h4 = 5 == e4 =5 – f6 = 5 == f9 = 5 forbids More...
30/Jun/18 8:35 AM
Basics to UP = 30
1. (7): d5 = d3 - f1 = a1 => -7a5 ; UP = 31
2. (5)f9 = f6 - i6 = i8 => -5h9
3. (3)h8 = (3-5)i8 = i6 - h4 = (5-2)e4 = (2-9)e8 = HP(39)*hi8 - (9)gh7 = d7 - d1 = (9)h1 => -5*h8, -9h8 ; UP = 32
4. (1=9)g7 - d7 = d1 - (9=1)h1 => -1h7 ; UP = 81
30/Jun/18 3:53 PM
8:53 with a few guesses.
30/Jun/18 4:17 PM
Basics to 30
1.X-Chain x=5 => e8h9<>5
x=7 => a5<>7 =>a5=5 Basics to 31
x=9 => h9<> 9 => g9h9=27
2. if g3=1 => g2h2=67 b2=3 h1==3 i2=9 e4=2 h5=2
i6=5 i5=1 d4=1 b4=8 a4=6 a8=8
b1c1=12 b8c8=27 b6c6=17 => g3<>1 =>g3=7 solve
30/Jun/18 5:16 PM
Basics to 30
1. Skyscraper (7)a1=f1-f6=bc6 =>-7a5; basics to 31
2. Kraken cell (137)b2 =>-2d7; singles to 81
||(1)b2-(1=9)e2-e8=(9)d7
||(3)b2-bc1=h1-h8=(3-5)i8=i6-h4=(5-2)e4=(2)e89
||(7)b2-a1=f1-(7=4)d3- d4=(45)eh4-(2)e4=(2)e89
01/Jul/18 3:05 AM
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