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Tough Sudoku for 21/December/2017

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Sudoku Solving Techniques

Submitted by: sudoku lover

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Basics to 27
1. (2)i8=(2-4)b8=(4-5)a7=(5)g7 =>-2g7; basics to 32
2. (314=5)g123-g7=(5-4)a7=(425-3)b589=(3)b4 =>-3g4; basics to 35
3. (6)g4=(6-5)g7=(5-4)a7=(4-9)b8=c8-(9=76)cf6 =>-6h6; basics to 47
4. (5)i3=g3-(5=4)g7-a7=(4-8)a1=(8)c3 =>-8i3; basics to 50
5. UR(67)cf56 =>+9c6; singles to 81
21/Dec/17 1:50 AM
A not-too-challenging Christmas pressie for us ...
21/Dec/17 2:15 AM
Basics to UP = 27
1. (2)i8 = (2-4)b8 = (4-5)a7 = (5)g7 => -2g7 ; UP = 32
2. (6): d9 = d4 - g4 = g7 => -6e7|h9 ; UP = 34
3. (8)c3 = HP(85)ig3 - g7 = a7 - (7=58)a95 => -8c5 ; UP = 37
4. (7)i4 = ab4 - c56 = c9 - (7=5)a9 - i9 = (5)i3 => -7i3 ; UP = 81
21/Dec/17 2:47 AM
In place of steps 3 and 4 above, this suffices:
3. (8*)c3 = (8-5^)i3 = g3 - g7 = a7 - (5=78*9)a954 - (9=17^)i45 => -8*c5, -7^i3 ; UP = 81
21/Dec/17 3:13 AM
Nice reflection, Kate.
21/Dec/17 6:28 AM
#28 8?@c5=>a1=8=>i3=8=>g3=5=>i9=5=>a7=5=>b8=4=>i8=2=>a6=2=>a5=7=>i5=1=> f3=1=>a2=1=>abc123<>4=>c5<>8
#32 1@a12=>a9<>1 9@df3=>i3<>9
5?@i9=>a9=7=>a4=9=>14@ag1=>e3=4=>17@i34=>i5=2=>b More...
21/Dec/17 7:37 AM
49:48
24/Dec/17 9:10 AM
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