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# Tough Sudoku for 27/January/2011

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Sudoku Solving Techniques

Submitted by: sudoku lover

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 Leave it to Wilodene to find the only rock in the world that eats plants! 27/Jan/11 12:08 AM SE=8.3 27/Jan/11 12:37 AM The beauty of the desert - even flowers can eek out an existance! 27/Jan/11 12:42 AM 1. SST to UP=292. (579)abg9=(7-4)g7=g2-f2=(4-8)f3=(138)bde5-(1)b7=(1-8)a7=c8 => c8<>9UP=81 27/Jan/11 1:15 AM 25:49, not as difficult as I thought an 8.3 would be. Good night all. 27/Jan/11 1:23 AM 1)SSTS to UP=292)(ht895=3)chi8-hi9=(3-6)f9=(6-7)g9=(7-4)g7=(4)i7,=>i7<>5.UP=81 27/Jan/11 1:50 AM 1. Note g2/i3=24.Unique possibilities to 29.2. Whether g1=3;OR g1=6=h7=f9,ab7=18,c8=9=i9,g9=3;g4=2.UP81. 27/Jan/11 1:55 AM It's truly amazing where trees and other plants can grow! 27/Jan/11 2:13 AM guess must try for depth 4 chain:1.SSTS to UP292.(4=5)i7-hi8=(257')bdf8-(3)df8=(36')fg9-(7)g9=g7 > -4g7, UP81 27/Jan/11 5:27 AM Who's eating whom? 27/Jan/11 5:38 AM can anyone prove +1d123 from start UP29? 27/Jan/11 5:57 AM reason asked is can't find compact AIC for such things w/o qht: (7)d5=f5-(148')f235=(1)d123 27/Jan/11 6:52 AM related matter, generating weak links from als bools based on forced configurations of digits in cell set. (link need not 'see' all digits in als to be weak) 27/Jan/11 6:57 AM (1)d123=(1-7)d5=(7-8)f5=(48)f23 => f23<>1 27/Jan/11 7:04 AM eg. (9=358)chi8-(8)c1 27/Jan/11 7:12 AM often longer alternatives present, but is that always true? 27/Jan/11 7:25 AM OR:(1=38)be5-(8=13567)f56789,=>d5<>1 27/Jan/11 7:45 AM reading some of ttt's and Steve's solutions brought this up - their often highly creative links (als aals style) using sometimes bools that could not ever be true in a chain, to good effect. (and why not use solved cells in chains?, URs and DP's may contain some cells already known - doesn't stop use of pattern for remaining cells) 27/Jan/11 8:14 AM YW's make excellent chain targets as well as chain bools - see possible path for January 13,2009 for a good example. 27/Jan/11 10:53 AM rocky horror ;) 27/Jan/11 11:41 AM