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Tough Sudoku for 23/April/2016

                 
                 
                 
                 
                 
                 
                 
                 
                 

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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Standard techniques UP 42
1. Loop (2=6)f4-f9=(6-7)e9=e3-(7=2)f3@ =>-26f5, ... UP 81
23/Apr/16 12:27 AM
1. Unique possibilities to 42.
2. Whether f5=2,f4=6;OR i5=2,i4=3;h4=8.UP81.
23/Apr/16 12:31 AM
Hi cenoman. Your logic seems to show that f5<>2 (which solves the puzzle), but not necessarily that f5<>6. Is that right?
Best Regards, Alfred.
23/Apr/16 12:47 AM
Hi Alfred,
The loop eliminates candidates seen by any weak link in the chain. 6f5 is eliminated by the link 6f4==6f9. Other eliminations result from this loop, e.g. 6f2, 9e9
Best regards. cenoman
23/Apr/16 12:59 AM
Was this after a flood?
23/Apr/16 1:33 AM
Very strange, but interesting.
23/Apr/16 3:18 AM
#29 1@h23=>h8<>1 #32 19@c79=>c3<>19
#43 2?@f5=>f3=7=>h8=7=>h9=8=>h4=6=>f4={}=>f5<>2
VHBC to #81
V:Only cell left in Vertical column for this candidate
H:Only cell left in Horizontal row for this More...
23/Apr/16 6:04 AM
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