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Submitted by: Gath

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Nice photo, Keyan!
Clouds never cease to amaze me! So many would be considered unbelievable if you were to paint them in a painting!
03/Feb/09 12:19 AM
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This looks like a nice green place!
03/Feb/09 12:24 AM
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I love it when Keyan checks in from remote corners of the Earth!
03/Feb/09 2:20 AM
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Nice contrast to the picture on hard
03/Feb/09 2:54 AM
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03/Feb/09 4:40 AM
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1)Start at23,basic techniques to UP=37
3)(8)b6=b1-g1=h23,=>h 6<>8
03/Feb/09 5:33 AM
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Hi Sotir. After pair 36 at e89, I could only get to UP 29. How did you make it to UP 37?
03/Feb/09 8:17 AM
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1) Start at 23 filled. UP to 27.
2) (hp36)e89, UP 29.
3) locked animals at: (4's)def6, (2's)g46, (2's)ac8, (7's)c456, quad(4578)a1357. UP 37.
4) (8)c9 = (8)hi9 - (8=5)i5 - (5)a5 = (5)a7, => a7<>8, c9<>5.
5) (4=1)b8 - (1=8)b6 - (8)b7 = (8)c9, => c9<>4. UP More...
03/Feb/09 10:44 AM
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Typo step 6 s/b: - (4=1)b8.
03/Feb/09 10:47 AM
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> 1.5 hours
03/Feb/09 2:36 PM
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I too found an intial fill to 37, though my ultimate solution was not nearly as nice as Sotir's. Noting the 12 pair at a4,8 the 37 fill happen, having applied fills for 1,2,3,6,9. This brings up a question about what you people consider as initial fill. My habit is to fill in particular numbers, More...
03/Feb/09 4:16 PM
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Thanks Dave. I missed the quad in column a.
03/Feb/09 10:17 PM
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Hi Mathman. I think a unique possibility for a cell is one where every other number except for the correct one ,leads to an immediate contradiction.If you need more complex reasoning, like forced chains of 5 and 9, as in your example,you should give your reasoning first, and then call it a UP.
03/Feb/09 10:46 PM
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09/Sep/10 9:11 PM
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after sotir's step 2 at UP=51, this is more efficient:

3.(8=1)b6-(1=2)a4-c6=g6 => g6<>8
4.SS(8)b16g15 => h6<>8, UP=81.
10/Jan/11 4:49 AM
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