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Tough Sudoku for 17/October/2018

                 
                 
                 
                 
                 
                 
                 
                 
                 

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Submitted by: Gath

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Father and son out to play golf!
17/Oct/18 5:04 AM
A long time since we have seen such a 'hard tough'...(S.E. 9.0)
Basics to 27
1. (9)i5=(9-2)g5=(2-7)g3=(7-9)e3=c3-c6=(9-6)b6=(6)b5 =>-6i5; basics to 28
2. (8=9)f7-g7=(9-2)g5=(2-7)g3=e3-e9=(7)f9 =>-8f9
3. (8=9)f7-*g7=(9-2)g5=(279)ceg3-(5)c3=c79-b7=(15)ce7 =>-8ce7, -9ce7*
4. More...
17/Oct/18 7:59 AM
16:57.
17/Oct/18 9:15 AM
6:46 with 3 guesses
17/Oct/18 12:07 PM
Basics to 27
1. if c6=9 => e3=9 g3=7 i8=9 g5=9 [g3,g5]<>2
=> b6=9 b5=6 => [e5,h5,i6]<>6 => i1=6
Basics to 30
2. if e6=6 => UR 36 eh46 => e4=6 solve
Note if e6=6 => d1=3 c7=1 X-chain x=8 =>
[d8,d9]<>8 X-chain x=5 =>[b9,e9,e3,h3,i3]<>5
17/Oct/18 5:51 PM
correction
2. Basics to 32
3.if f2=7 => X-chain x=1 => [c9,e7]<>1
X-chain x=4 => [a1,c9]<>4
XY-chain 3458 [a7,b7,c9,c5] => [a5,c7]<>3
a5=4 c5=3 solve
17/Oct/18 8:28 PM
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