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# Tough Sudoku for 13/September/2010

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Submitted by: Gath

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 SE=7.3 13/Sep/10 12:09 AM The hills are alive with the sounds of muuuuuussssiiiccccc... 13/Sep/10 12:59 AM 24:41 13/Sep/10 1:10 AM 1) Start at 23,SSTS to UP=262) (7)f9=(7-8)b9=c7-c1=f1-e23=(8-1)e4=e78-(1=2)d9,=>f9<>2.UP=313)(9=5)f3-f8=b8-(5=8)c8-c1=(8 -4)f1=(4)d1,=>df1<>9.UP=81 13/Sep/10 1:53 AM Sorry,I have to revise my solution.Step 3 is not valid. 13/Sep/10 2:01 AM 1.SST to UP=26 (using complex but shorter chains)2.(7)f9=e7-(7=268)e236-(8)f1=c1-c7=b9 => b9<>7; UP=313.(68=2)e23-XW(2)ei68=df6-f45=HP(24)f16 => f1<>8; UP=81. couldn't resist that almost XWing link. 13/Sep/10 2:38 AM 43:25 13/Sep/10 2:59 AM you can of course run the chain around the XWing:2.(68=2)e23-e8=i8-i6=def6-f45=HP(24)f16 => f1<>8.//the chain length efficiency would be greater if it were an almost swordfish. 13/Sep/10 3:11 AM 1) Start at 23,SSTS to UP=262) (7)f9=(7-8)b9=c7-c1=f1-e23=(8-1)e4=e78-(1=2)d9,=>f9<>2.UP=313)(5):b8=f8-f3=d2,=>b2< >54)(5=268)d2e23-(8)f1=c1-(8=5)c7,=>d7<>5.UP=81 13/Sep/10 3:21 AM SST to UP=26.i)(1)a8=(1-7)a7=(7-9)e7=e8=>e8<>1ii)loop: (7)a7=(7-1)e7=(1-8)e4=f45-f1=c1-c7=(8-7)b9=a7=>e7<>7,cf3<>8UP=31.iii)kraken cell (238)f4=>f1<>8(2)f4-a4=c45-(2=8)c1||(3)f4-(3=5)f8-f7=(5-8)c7=c1||(8)f4UP=81. 13/Sep/10 3:25 AM 1. Unique possibilities to 26.2. Whether a8=1;OR a7=1,b9=7,f9=2,d9=1; e8<>1.3. If c7=8=b2=e4,e7=1;the 18 rectangle at gi39 cannot be resolved. So c7=5.UP81. 13/Sep/10 4:34 AM I noticed later that my step 2 is not necessary. When 1 is locked at e78 (after e4=8), then, by inspection, the 18 AUR can already be invoked. 13/Sep/10 8:56 AM