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Submitted by: Gath

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9:90
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Ooh, pizza for tea tonight
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Nice game and very 'inviting' pizza I guess
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9:05 - Surprisingly easy
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17:58 Pizza looks great!!!
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ouchy, that was tricksy
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12:50 with a break in the middle to clear the head and re-focus the watery eyes. I guess that means it's time for bed.ZZZZZ Night all.
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10:01
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You must have watery eyes - it's only 11:50!!!
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UP to 28; d45=5 elim e46=5; gi6=5 elim gi5hi4=5; h78=5 elim gi8=5; pigeonhole matrix
i2=2 i2=3 0000 0000
g9=2 0000 g9=1 g9=9
0000 0000 g8=1 g8=9
0000 i8=3 i8=1 i8=9 eliminates g3=2; UP to 32;
At this point the best I can do is to find a depth 5 matrix eliminating f5=9, and so forcing f6=9. But I don't see a good way to proceed from here, and don't have time today to spend on it.
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At 28 filled a depth 4 fc eliminates i2=3. Basically the same as Andrei's elimination of g3=2. Obscure from there on.
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forgot to pause timer during interruption. G'Maen, all. Looks yummy.
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In case you wondered,
i2=2==i9=2--i9=8==h7=8--h4=8= =h4=6--h2=6==h2=3
(You have to use some X-boxes in 5's first.)
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Egads, what are you people talking about? Where does one find the code book to the lingo? I can do the puzzles, but not with such math or even what a g3, for instance, is!
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I couldn't do this one without guessing
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Linda W, if you really want to know, go to 'proofs' at the bottom of the page and take the next link to Bruno's proofs. Read the material you find there. Or just have fun guessing your way through these toughies.
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It must have been an easy one.
I never cheat, so i solve the tough only once every 10 days.
Today it took only a few (?10?) minutes.
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I found my way to I2=2 (32 filled). ANyone have any ideas from here?
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NOt optimized!
1) Start at 23 filled - the given puzzle. Unique possibilities (UP) to 28.
2) Locked 5's forbid 5 at e46. Locked 5's forbid 5 at gi5, hi4. Locked 5's forbid 5 at gi8.
3) depth 4 fc like: i2=2 == i2=3 -- i8=3 == i8=19, using h8=19 -- h9=19 == h9=2 forbids h3=2. UP More...
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Please allow for typo's in my proof above, as I have little time either to optimize nor to check for the errors which I always make in typing! Thank-you for your forbearance in this matter.
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If one uses Andrei's depth 5 fc, then after my step 7, a colors elimination on 3's (depth 2)appears which prolly unlocks the puzzle - I have not checked it - but believe it to be true.
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14:35
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Sorry the color's fc does not unlock the puzzle, so I have to go back to just my original posted solution.
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Steve - how do you easily see these combos?
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Got it. Couldn't have done it without the hints.
Thanks.
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Optimized a tad:
1) Start at 23 filled - the given puzzle. Unique possibilities (UP) to 28.
2) Locked 5's forbid 5 at e46. Locked 5's forbid 5 at gi5, hi4. Locked 5's forbid 5 at gi8.
3) depth 4 fc like: i2=2 == i2=3 -- i8=3 == i8=19, using h8=19 -- h9=19 == h9=2 forbids h3=2. UP More...
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Latter solution essentially the earlier one, just jostled order of fc's, and uses pair 45 then to eliminate a nasty 4 at e4 rather than the depth 7 fc.
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OK I have erred. The wrap around fc also forbids the 1's at a89,b8,c9 therefor delete step 5, lose 1 set.
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Steve: very elegant, especially the 'wrap-around' chain! BTW, this wrap-around property is also nicely visualized by the corresponding pigeonhole matrix: if the entries in the first column are also in conflict with each other, then EVERY column is a strong set.
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with an early guess in a pair,right straight the solution!
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Keep promising myself to research the sudoku lingo and begin employing the strategies mentioned, but today wasn't the day! Guessed like crazy and still found it challenging. Cheers to all who found it less vexing than me.
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Yum! I know what I want for supper tonight!
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maEn to all. Suppertime here, and that pizza makes me hungry. Time to eat, but not pizza tonight. Just leftovers from Sunday's meal.
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20:55
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Over half an hour and I still had to guess! Not interested in pizza. I've just had breakfast.
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Linda, I echo your comments.
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I'm not so clever to be able to see those long chains, or usually even follow them, but after reaching 32 I saw the 1-5 pair in gi6, and that did the puzzle for me from there.
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Hip Hip hooray for me, I am fantastic today... I normally have to cheat a lot, but today was logic all the way.
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Very good Sarah - the magical forbidding of 8 and 89 from gi6, revealing the pair 15 does indeed solve the puzzle!
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24:09
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