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Tough Sudoku for 21/October/2019

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Submitted by: Gath

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1:33.
21/Oct/19 12:42 AM
Pretty fast time there, Tom ...
21/Oct/19 12:49 AM
Basics to 24
1.X-chain x=4 => h7<>4 => h5=h9=24 =>g5=8
basics to 42
2. if i4=6 =>a6=h7=6 a4=4 a7=g9=1 g7=7 f9=8 i9=4
i7=5 =>d7=0 => i4=5 solve
21/Oct/19 2:42 AM
1. Unique possibilities to 24.
2. Whether a4=4=h5;OR a7=4;h59=24.UP42.
3. Whether g7=1,d7=7;OR g9=1=f5;f8=5.UP59.
4. Whether i4=5;OR i7=5,a7=4;a4=6.UP81.
21/Oct/19 4:14 AM
All that glitters is not gold, but in this case I guess it is!
21/Oct/19 5:11 AM
Basics to 24
1. Grouped kite: (4)h5=bc5-a4=a7 =>-4h7; basics to 42
2. (1=7)g9-g7=d7-(7=16)d9.e8 =>-1f9; basics to 59
3. BUG+2 (5)h6==(6)i7-(6=5)i4 => -5g6; singles to 81
21/Oct/19 8:22 AM
Basics to 24
1. (4): a7 = a4 - i4 = h5 => -4h7 ; UP = 42
2. Kraken row (5)dhi7 => -1a7 ; UP = 81
|| (5)d7 - (5=81)f89 - (1)e8 = (1)bc8
|| (5-6)h7 = h6 - (6=1)a6
|| (5-4)i7 = (4)a7
21/Oct/19 9:45 AM
Oh dear, Judy! Let's try 16:33. 🙃
21/Oct/19 3:54 PM
basics to 42
2. W-wing 18 [d2,f9] => d79<>1
W-wing 17 [c8,g9] => b9<>>7
XY-wing 167 [e8,d9,g9] => f9<>1 => f9=8
W-wing 46 [a4,i9] => i4 <> 6 => i4=5 solve
21/Oct/19 4:25 PM
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