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# Tough Sudoku for 23/April/2016

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Submitted by: Gath

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 Standard techniques UP 421. 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, 9e9Best 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<>2VHBC to #81V:Only cell left in Vertical column for this candidateH:Only cell left in Horizontal row for this More... 23/Apr/16 6:04 AM