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# Tough Sudoku for 28/August/2009

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Submitted by: Gath

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 Have a wonderful day/night, everyone! 28/Aug/09 12:43 AM I have yet to develop a fondness for cacti. Then again, I haven't been around too many living where I do. So, there is hope for changing my opinion! 28/Aug/09 1:23 AM Love it when the desert is in bloom - wonderful, Sue! 28/Aug/09 2:39 AM >1hr 28/Aug/09 6:47 AM Very tenacious puzzle today:1. Unique possibilities to 35.2. If c6=8,locked 8s at ab7,d8=8 and central box is devoid of 8.So c6=4.UPs to 41.3. If f5=1,g5=5=d3,and bottom right box is devoid of 5.So f1=1.UP42.4. If e5=1,g5=5=f2 and top middle box is devoid of 5.So e4=1.UP43.5. If More... 28/Aug/09 11:14 AM I've had many positive responses to the Eclipse photos on my page.Thanks again to Steve Lee for the photos,and June and Sharon for their help in displaying them. 28/Aug/09 11:23 AM 1)Start at 22,basic techniques to UP=352)(8):c8=d8-d4=a4,=>a7c6<>8.UP=413)(5)g2=f2-d3=d6-e56=(5)e8,=>g58<>8.UP=4 54)(9=5)i7-(5=3)f7-(3=7)f9-f5=(7-4)e5=h5-(4=3)h4-(3=9)h3=>i3h89<>9.UP=475)YW:(9=1)c8- (1=5)h8-(5=9)i7,=>a7i8<>9.UP=81 28/Aug/09 5:11 PM Hi Sotir.In your Step 4),you state 7 at e5 enables 4 at h5.Can't d5=4 at this stage, as well (as at h5)?A couple of typos,I think, in step3: d6 should read "d5" and g58<>8 should read "g58<>5" ?Regards, Alfred. 28/Aug/09 6:03 PM This one would make a nice study on using uniqueness techniques. Only steps 5d, 5e, and 6b below are not standard easy techniques. All three invoke uniqueness.1) start 22 UP 272) (LC1)c89 => c3<>1 UP 353) (FXW8) f7=f6-c6=c78 => ab7<>8 UP 414a) (lc4)g12 => More... 28/Aug/09 6:06 PM Hi again Sotir.After seeing Steve's step 5c),it finally dawned on me that d5=56 (not 4).Regards, Alfred. 28/Aug/09 11:04 PM Thanks Alfred,Typos:3)d6 should read d5 and g58<>8 should read g58<>5.Step 4 is OK.Regards,Sotir. 29/Aug/09 5:06 AM 44:31 31/Aug/09 7:28 AM SE=7.2 09/Sep/10 11:22 PM