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What do you think of this puzzle? http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=5&t=214 |
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Author: | enxio27 [ Mon Aug 04, 2008 4:03 pm ] |
Post subject: | What do you think of this puzzle? |
This is puzzle # 288086 from menneske.no. He lists it as "Very Hard". SadMan Sudoku rates it as "Diabolical". Sudocue says it's unsolvable (with ALL solving routines turned on in the default order). Is it? Code: . . .|. . 6|8 5 . . 6 4|. 8 .|1 . . . 8 .|3 . .|. . . -----+-----+----- 8 . .|. 9 7|5 . . . 9 .|. . .|. 7 . . . 5|4 2 .|. . 9 -----+-----+----- 4 5 .|. . 2|. 8 . 7 . .|. 5 .|6 9 . . . .|7 . .|. . . 000006850064080100080300000800097500090000070005420009450002080700050690000700000 |
Author: | Jean-Christophe [ Mon Aug 04, 2008 4:21 pm ] |
Post subject: | Re: What do you think of this puzzle? |
JSudoku wrote: The grid is solved! Techniques used: 36 Naked Singles 17 Hidden Singles 3 Hidden Pairs 4 Intersections 1 X-Wing 1 Skyscrapers 1 Two String Kites 1 Empty Rectangles 2 XY-Wings 1 XYZ-Wings 5 XY-Chains up to 5 links 1 Grouped Turbot Chains with 5 links Sudoku Explainer wrote: Analysis results
Difficulty rating: 7.3 This Sudoku can be solved using the following logical methods: 51 x Hidden Single 1 x Direct Hidden Pair 4 x Pointing 1 x X-Wing 3 x Hidden Pair 1 x XYZ-Wing 3 x Turbot Fish 7 x Forcing Chain |
Author: | Glyn [ Mon Aug 04, 2008 11:34 pm ] |
Post subject: | Re: What do you think of this puzzle? |
enxio It is necessary to activate Medusa/ALS to solve this in Sudocue, these are not amongst the Default settings. |
Author: | enxio27 [ Tue Aug 05, 2008 2:32 am ] |
Post subject: | Re: What do you think of this puzzle? |
Glyn wrote: enxio It is necessary to activate Medusa/ALS to solve this in Sudocue, these are not amongst the Default settings. Oh, I have ALL of the solving techniques turned on. It's the solving ORDER that I haven't changed from the default. It puzzles and frustrates me that Sudocue is declaring some puzzles unsolvable/invalid that other software doesn't seem to have a problem with. I guess it wouldn't matter much except that I depend on Sudocue to rate the puzzles. I haven't found anything else that will give as "precise" a rating AND that will rate a batch of puzzles at once. |
Author: | leeo [ Wed Jun 17, 2009 12:27 am ] |
Post subject: | Re: What do you think of this puzzle? |
.....685..64.8.1.7.8.3..9..843.975...9....478.754283.945...278.7..85.69...87..2.5 Code: `1239 1237 `12379 | `129 `147 ````6 | ``8 ```5 `2347 `2359 ```6 `````4 | `259 ```8 ```59 | ``1 ``23 ``237 `1259 ```8 ``1279 | ```3 `147 `1459 | 249 `246 `2467 ------------------+-----------------+---------------- ````8 1234 ``1236 | ``16 ```9 ````7 | ``5 1246 `1246 `1236 ```9 ``1236 | 1568 `136 `1358 | `24 ```7 12468 ```16 ``17 `````5 | ```4 ```2 ```18 | ``3 ``16 ````9 ------------------+-----------------+---------------- ````4 ```5 ``1369 | `169 `136 ````2 | ``7 ```8 ```13 ````7 `123 ``1238 | ``18 ```5 `1348 | ``6 ```9 `1234 12369 `123 123689 | ```7 1346 13489 | `24 1234 12345 single niches: _[4]_ <cb> r4c2 _[5]_ <rcb> r9c9 _[7]_ <r> r2c9 <rb> r6c2 _[8]_ <cb> r5c9 <r> r6c6 _[9]_ <cb> r3c7 single niches: _[3]_ <r> r4c3 _[4]_ <rb> r5c7 _[8]_ <cb> r8c4 <r> r9c3 Code: 1239 123 1279 | 129 `147 ```6 | 8 ``5 234 2359 ``6 ```4 | 259 ```8 ``59 | 1 `23 ``7 `125 ``8 `127 | ``3 `147 `145 | 9 246 246 --------------+---------------+----------- ```8 ``4 ```3 | `16 ```9 ```7 | 5 126 126 `126 ``9 `126 | 156 `136 `135 | 4 ``7 ``8 ``16 ``7 ```5 | ``4 ```2 ```8 | 3 `16 ``9 --------------+---------------+----------- ```4 ``5 `169 | 169 `136 ```2 | 7 ``8 `13 ```7 123 ``12 | ``8 ```5 `134 | 6 ``9 134 1369 `13 ```8 | ``7 1346 1349 | 2 134 ``5 trios: [ 123 ] <b> _b7p568_ b7p37 b7 is the 7th box, where the boxes are numbered typewriter fashion 1 2 3 4 5 6 7 8 9 p568 are the fifth, sixth, and eighth positions in the box again in the same typewriter coordinates. rb bc claims: [3] _r89c2_ <bc> r1c2 fish fins: [ !=4 ] <r18> _r3c6_ _r9c5_ r3c6 and r9c5 cannot have a 4 as a candidate, because that would case r1 and r8 to both have to have 4 as a candidate in only column 8. Code: 1239 `12 1279 | 129 147 ```6 | 8 ``5 234 2359 ``6 ```4 | 259 ``8 ``59 | 1 `23 ``7 `125 ``8 `127 | ``3 147 ``15 | 9 246 246 --------------+--------------+----------- ```8 ``4 ```3 | `16 ``9 ```7 | 5 126 126 `126 ``9 `126 | 156 136 `135 | 4 ``7 ``8 ``16 ``7 ```5 | ``4 ``2 ```8 | 3 `16 ``9 --------------+--------------+----------- ```4 ``5 ``69 | 169 136 ```2 | 7 ``8 `13 ```7 123 ``12 | ``8 ``5 `134 | 6 ``9 134 ``69 `13 ```8 | ``7 136 1349 | 2 134 ``5 trios: [ 136 ] <c> _r579c5_ r13c5 Now bringing out the big guns. als xz: _12_ r1c2 =2= r3c16 [ !=1 ] r3c3 _12_ r1c2 =1= r3c3589 [ !=2 ] r3c1 _127_ r1c234 =7= r3c136 [ !=2 ] r1c1 the two sets r1c2 and r3c16 have a 1 and 2 in common, and if 2 is in one of them, 2 cannot be in the other. the 1 in r3c3 touches the all the 1's in both sets, so r3c3 cannot be a 1 as it would cause both sets not to have a 1. Both sets are of the type that if two candidates are not in the sets, one of the cells in the two set would have to be blank. Code: `139 `12 1279 | 129 `47 ```6 | 8 ``5 234 2359 ``6 ```4 | 259 ``8 ``59 | 1 `23 ``7 ``15 ``8 ``27 | ``3 `47 ``15 | 9 246 246 --------------+--------------+----------- ```8 ``4 ```3 | `16 ``9 ```7 | 5 126 126 `126 ``9 `126 | 156 136 `135 | 4 ``7 ``8 ``16 ``7 ```5 | ``4 ``2 ```8 | 3 `16 ``9 --------------+--------------+----------- ```4 ``5 ``69 | 169 136 ```2 | 7 ``8 `13 ```7 123 ``12 | ``8 ``5 `134 | 6 ``9 134 ``69 `13 ```8 | ``7 136 1349 | 2 134 ``5 nice loop =3= r2c8 -2- r3c8 -6- r3c9 =6= r4c9 -6- r6c8 =6= r6c1 -6- r5c3 =6= r7c3 =9= r7c4 -9- r1c4 -1- r3c6 =1= r3c1 =5= r2c1 =3= r1c1 -3- r1c9 =3= proves r2c8 != 2 RC XWing: _[_-9]_r1c34_r7c34_<r>_ r2c4 also _[_-9]_r29c1_r29c6_<c>_ r2c4 als xz: _149_ r1c249 =9= b8p1268 [ !=4 ] r8c9 _1269_ r1358c3 =9= r1245c4 [ !=6 ] r5c5 pairs: [ 13 ] <c> _r78c9_ r4c9 rb bc claims: [6] _r45c4_ <bc> r7c4 fish fins: [ !=1 ] <r146> _r3c1_ [ !=1 ] <r346> _r1c4_ _r5c6_ Code: ``3 `12 1279 | `29 `47 `6 | 8 ``5 `24 `29 ``6 ```4 | `25 ``8 59 | 1 ``3 ``7 ``5 ``8 ``27 | ``3 `47 `1 | 9 `26 246 -------------+------------+----------- ``8 ``4 ```3 | `16 ``9 `7 | 5 126 `26 126 ``9 `126 | 156 `13 35 | 4 ``7 ``8 `16 ``7 ```5 | ``4 ``2 `8 | 3 `16 ``9 -------------+------------+----------- ``4 ``5 ``69 | `19 136 `2 | 7 ``8 `13 ``7 123 ``12 | ``8 ``5 `4 | 6 ``9 `13 `69 `13 ```8 | ``7 136 39 | 2 ``4 ``5 rb bc claims: [1] _r56c1_ <cb> r5c3 als xz: _19_ r7c4 =9= r9c26 [ !=1 ] r9c5 _13_ r7c9 =1= b8p19 [ !=3 ] r7c5 _26_ r4c9 =6= r147c4 [ !=2 ] r1c9 _19_ r1c24 =1= r9c26 [ !=9 ] r2c6 r7c4 _19_ r9c26 =1= b1p24 [ !=9 ] r9c1 _126_ b4p67 =1= r36c8 [ !=2 ] r3c3 _16_ r58c3 =1= r9c126 [ !=6 ] r5c1 r6c1 r7c3 Code: Sudoku box `3 `12 1279 | `29 47 `6 | 8 ``5 ``4 29 ``6 ```4 | `25 `8 `5 | 1 ``3 ``7 `5 ``8 ```7 | ``3 47 `1 | 9 `26 246 ------------+-----------+----------- `8 ``4 ```3 | `16 `9 `7 | 5 126 `26 12 ``9 ``26 | 156 13 35 | 4 ``7 ``8 `1 ``7 ```5 | ``4 `2 `8 | 3 `16 ``9 ------------+-----------+----------- `4 ``5 ```9 | ``1 16 `2 | 7 ``8 `13 `7 123 ``12 | ``8 `5 `4 | 6 ``9 `13 `6 `13 ```8 | ``7 36 39 | 2 ``4 ``5 now singles solve |
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