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Tough Sudoku for 30/July/2017

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

  1 2 3 4 5 6 7 8 9
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Submitted by: Gath

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1. b3=5, a1=7, XWing{1ai46}, f5=1
2. 3abc6=3i6-Loop[(3=2)i9-2e9=HP(12-9)e87=9c7-(9=3)a9] -> -{3a4, 2cg9, (67)e8, (56)e7, 9c9, 3cdg9}
3. 3a9 -> 0 solution via XY-Chain{(81)h8, (15)h7, (56)f7, (62)b7, (24)b2, (42)c1, (28)g1} -> -{(24)c2, 8h3, 8g9}; a9=9 and 14 singles
4. More...
30/Jul/17 2:30 AM
Kate, for a fun puzzle, and a nice photo too.
30/Jul/17 3:47 AM
SE=8.5
A long path:
Basics to UP=25
1)(2=21)e987-(9)e7=c7-(9=3)a9-(3=2)i9,=>e8=12,e7=129,c9<>923,d9<>3,g9<>2 3
2)AUR(13)ai46:(3)g4=(9-1)a4=(1)i4,=>ai4<>3
3)AUR(13)ai46:(3)g4=(9)a4-(9=4)h4,=>a4< More...
02/Aug/17 6:25 AM
Typo:3)=>g4<>94
02/Aug/17 6:28 AM
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