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Submitted by: uno hu

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Hello all!! I have blogged today's tough puzzle. The link to the page can be found in the far right column, at the top, under "Check out the Sudoku Blog".

Today's puzzle serves as a useful example of at least one fairly easy technique.
15/Jun/09 11:11 PM
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Looks like spokes of a wheel. A new invention of the wheel... a wheel of learning?
16/Jun/09 12:19 AM
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What a sense of power the Reference Librarian seated at the center of the hub must feel!
16/Jun/09 12:24 AM
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Great photo! Have a nice day/night, everyone!
16/Jun/09 12:28 AM
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16:19 to you all from Beijing.
16/Jun/09 1:01 AM
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It looks like a beautiful library!
16/Jun/09 8:26 AM
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1. Unique possibilities:b8=6=d1.(UP 24)
2. If b3=3,b5=5.Likewise d3=3,e5=3,pairs 29 at ac5;13 at ci6 makes b5=5.h6=4,h3=9.(UP 27).
3. If d3=3,e5=3.If e2=3,b3=3,e8=1,pair 13 at ac7.Now if d3=2,e5=2, and if d3=7,b7=7,b4=9=e5.So e5=239;triple 239 at ace5;i5=5=h2,g5=8,h4=6.(UP31).
4(a). If More...
16/Jun/09 9:45 AM
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In 4(a),after f7=2=c6, row 7 is already devoid of 4,proving d3 is not 2.

Hi Steve.In your blog,after you show d3=3,f2 becomes 7,so you reach UP52 (not 51).It doesn't effect the rest of the proof however.Regards,Alfred.
16/Jun/09 10:54 AM
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Thanks for taking the time to read my blog, Alfred!
I think that I would need to execute another step, albeit easy, to get to UP 52. For example, hidden pair 59 at ef1, would do the trick. Of course, so would naked pair 12 at e2f3. Often in the blog, some easy and/or superfluous steps are not taken in order to attempt to make the page shorter.
16/Jun/09 1:46 PM
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Taken from the nose-bleed section!
16/Jun/09 3:16 PM
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Look how empty it is. Everybody is at home using Internet.
16/Jun/09 4:03 PM
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I've been there - it's so quiet! The Librarian at the centre is ever vigilant, checking for misdemeanours - people talking, writing on books, chewing gum - a very scary place! (Of course this was 35years ago - it may have changed)
And not an Ape in sight! ;)
16/Jun/09 5:26 PM
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Another alternative:
1)Start at 22,=>UP=24
2)YW-style (bd3=3):(59=3)df4-d3=b3-(3=5)b6,=>b4df6<>5.UP=27
3)Loop:(5)e12=f12-(5=9)f4-d4=d89-(9=5)e9, =>e58f9<>59,ab4<>9.UP=36
4)YW-style (de8=2):(3=2)d3-d8=(2-1)e8=(1)e2,=>e2<>3.UP=52
5)(1)e2=e8-a8=(1-3)a7=c7-(3=2)c2,=>e2< ;>2.UP=81
16/Jun/09 11:32 PM
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09/Sep/10 10:47 PM
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1.SSTS to UP=24
2.{(9=5)e9-d89=d46-(5=9)f4-SF:bdh234=d89} => e58|f239|a4<>9, e58|f69<>5

3.(2=1)e8-(148=2)f679 => e5<>2 UP=52
4.(2=1)e8-a8=(1-3)a7=a2-(3=2)c2 => e2<>2 UP=81.
17/Jan/11 11:55 AM
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