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Tough Sudoku for 8/December/2018

                 
                 
                 
                 
                 
                 
                 
                 
                 

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Sudoku Solving Techniques

Submitted by: sudoku lover

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18:17.
08/Dec/18 1:06 AM
1. Unique possibilities to 25,
2. Whether b3=4=c4;OR c1=4=d8;h8=4.UP29.
3. Whether h7=7,g8=3,f8=2;OR h5=7=c4,c1=4=i4,i6=6,i2=2=a1;a8=8.UP37.
4. Whether e2=3;OR h2=3=f7;e8=7.UP51.
5. Whether i6=6;OR i4=6,a4=5;e6=5.UP81.

08/Dec/18 1:54 AM
Basics to 25
1. (4)f3=b3-b6=i6-h4=h8 =>-4f8; basics to 29
2. (3)e2=e8-g8=h7 =>-3h2; basics to 32
3. (4)c1=(4-7)c4=g4-*(7)h5=(7-3)h7=f7-(3=2)f8-a8=(2)c7^-c2=(2-6)i2=(6)h13 =>-6h5*, -2c1^; basics to 51
4. (5)b7=d7-e9=e6 =>-5b6; singles to 81
08/Dec/18 2:24 AM
Hi Meggs. You are a real sweetie! I'll bet you're a big dog now.
08/Dec/18 6:06 AM
#26 9?@f4=>h4=4=>{f8=4=>a8=2,c1=4=>d1=9}=>g1=2=>a1=8=>56@ab3=>f3=3=>e8=3=> ;h1….9<>3=>f4<>9
#28 1?@e2=>e8=3=>h7=3=>a….i2<>3=>e2<>1
#29 More...
08/Dec/18 12:11 PM
Basics to 25
1.X-chain x=3 =>[e8,f3,h2] <>3
x=4 =>[f8,h4,i9]<>4 x=7 => c7<>7 => h4=9 h8=4
Basics to 32
2. if h5=7 =>c7=f7=2 => h7=7 =>g9=9 g8=3...
Basics to 51
3. X-chain x=5 =>[b9,b6,d9,d1,e9,f4,g3]<>5
x=6 =>[a4,b2,d9,f3]<>6 => a3=6 d1=4 ... solve
08/Dec/18 7:53 PM
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