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# Tough Sudoku for 15/January/2016

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Submitted by: Gath

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 SE=7.2 UP to 301)M-Ring:(3=9)g9-i7=(3-9)e7=(9)hi7 => e7<>78,i9<>39,i8<>92)Ext. W-Ring:(1)c6=(7)b4,(8)c7=(5)c9 or (1)h6=(7)h9,(8)g4=(4)e4=(8)e9 => b9<>7,c9,f7<>8 UP=81 15/Jan/16 1:31 AM #29 4@f12=>de3<>4#31 8?@f7=>i5=8=>g4=1=>c6=1=>c7={}=>f7<>8#32 7?@f7=>d4=7=>b4=1=>c6=5=>e6=6=>f6={}=>f7<>7VHBC to #81V:Only cell left in Vertical column for this candidateH:Only cell More... 15/Jan/16 7:25 AM Nice shot, Bev. Crested pigeons are much prettier than the ordinary ones. 15/Jan/16 7:44 AM Standard techniques UP 301. (8=1)c7-c6=h6-(1=8)g4-i5=(8)f5 =>-8f7 UP 81 15/Jan/16 8:44 AM 1. Unique possibilities to 30.2. Whether b4=1,g4=8;OR c6=1,c7=8;f5=8.UP43.3. Whether h9=1=c6,b4=7;OR h9=7=i4;d4=5.UP81. 15/Jan/16 11:58 AM Hi Les. After f5=8,348 @ d9e79,and d8=9.I then make it to UP43. Hi cenoman. After f5=8, I can only reach UP43.Don't you need another step to reach UP81? Best Regards, Alfred. 15/Jan/16 12:05 PM Sorry, should read ......and e8=9. (not d8). 15/Jan/16 12:09 PM Hi Alfred,Once you have reached 43 solved cells, you can notice the naked triplet (157)@h569, and then the locked pair (5)@i13 =>-5i4. So d4=5 and unique possibilities UP 81Best regards. cenoman 15/Jan/16 8:34 PM Thanks cenoman, I missed that triplet. Best Regards, Alfred. 15/Jan/16 8:41 PM Thanks Alfred,I missed 348 @ d9e79.Cheers Les. 16/Jan/16 8:08 AM #29 4@f12=>de3<>4 #31 8?@f7=>i5=8=>g4=1=>c6=1=>c7={}=>f7<>8#32 157@df8f7=>e8<>57 #44 157@h569=>h1<>5=>5@i13=>i4<>5VHBC to #81V:Only cell left in Vertical column for this candidateH:Only cell More... 16/Jan/16 8:09 AM 35:46 18/Jan/16 2:15 AM