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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Thu Mar 12, 2009 12:24 am Post subject: An extra hard BB? |
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The Brain Basher's Super Hard from a week ago seems to be much harder than normal. Am I missing something?
| Code: | Puzzle: BB030209sh
+-------+-------+-------+
| . 7 . | . 3 . | . 4 . |
| 6 . . | . 2 . | . . 5 |
| . . 4 | 8 . 1 | 9 . . |
+-------+-------+-------+
| . . 7 | . . . | 1 . . |
| 2 8 . | . . . | . 7 9 |
| . . 6 | . . . | 4 . . |
+-------+-------+-------+
| . . 9 | 2 . 3 | 5 . . |
| 7 . . | . 1 . | . . 3 |
| . 3 . | . 6 . | . 2 . |
+-------+-------+-------+
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(Normally, they take an X- or XY-wing or two.)
There is an incredible UR elimination lurking here!
Keith |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu Mar 12, 2009 1:56 am Post subject: Re: An extra hard BB? |
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[Withdrawn: What I mentioned would have been obvious to you.]
Last edited by daj95376 on Thu Mar 12, 2009 2:08 am; edited 1 time in total |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Mar 12, 2009 2:06 am Post subject: |
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| Code: | .---------------------.---------------------.---------------------.
| 1589 7 158 | 569 3 569 | 2 4 18 |
| 6 19 138 | 479 2 479 | 378 138 5 |
| 35 2 4 | 8 57 1 | 9 36 67 |
:---------------------+---------------------+---------------------:
| 3459 459 7 | 356 589 2568 | 1 3568 268 |
| 2 8 135 | 13456 45 456 | 36 7 9 |
| 1359 159 6 | 1357 5789 2578 | 4 358 28 |
:---------------------+---------------------+---------------------:
| 148 146 9 | 2 478 3 | 5 168 14678 |
| 7 456 2 | 45 1 458 | 68 9 3 |
| 1458 3 158 | 4579 6 45789 | 78 2 1478 |
'---------------------'---------------------'---------------------' |
for a VH+ type puzzle, that is impressive. just about every move depends on the one before it. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Mar 12, 2009 2:32 am Post subject: |
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OK, I put this one through Sudoku Susser.
I believe it belongs on my list of the best Sudoku puzzles ever. I have seven advanced moves, including the incredible UR.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Mar 12, 2009 3:23 am Post subject: |
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| I had eight moves, unless you count two ERs as one. Agree it's an excellent puzzle for those who enjoy using a bunch of steps. My UR was a very non-incredible Type 4. I did see a potential DP in the middle stack but there were too many possibilities for me to pursue it. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Mar 12, 2009 9:23 pm Post subject: |
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After basics: | Code: |
+-------------------+-------------------+-------------------+
| 1589 7 158 | 569 3 569 | 2 4 18 |
| 6 19 138 | 479 2 479 | 378 138 5 |
| 35 2 4 | 8 57 1 | 9 36 67 |
+-------------------+-------------------+-------------------+
| 3459 459 7 | 356 589 2568 | 1 3568 268 |
| 2 8 135 | 13456 45 456 | 36 7 9 |
| 1359 159 6 | 1357 5789 2578 | 4 358 28 |
+-------------------+-------------------+-------------------+
| 148 146 9 | 2 478 3 | 5 168 14678 |
| 7 456 2 | 45 1 458 | 68 9 3 |
| 1458 3 158 | 4579 6 45789 | 78 2 1478 |
+-------------------+-------------------+-------------------+
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After an X-wing on <3>, and one on <7>:
| Code: |
+----------------+----------------+----------------+
| 589 7 58 | 569 3 569 | 2 4 1 |
| 6 19 13 | 479 2 479 | 37 8 5 |
| 35 2 4 | 8 57 1 | 9 36 67 |
+----------------+----------------+----------------+
| 3459 459 7 |356 -589 2568a| 1 356 28d |
| 2 8 135 | 1456 45 456 | 36 7 9 |
| 1359 159 6 |1357 -589 2578b| 4 35 28c |
+----------------+----------------+----------------+
| 48 46 9 | 2 478 3 | 5 1 67 |
| 7 456 2 | 45 1 458 | 68 9 3 |
| 158 3 158 | 579 6 5789 | 78 2 4 |
+----------------+----------------+----------------+
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abcd is a type-3 UR. and ab make a pseudo-cell <567>. With the following cells in B5, <1456> <45> <1357> <456>, it forms a sextet in <134567>. You can eliminate <5> in the two cells shown.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Mar 12, 2009 9:28 pm Post subject: |
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| I don't know that I would've ever seen that. That's the one I played as a Type 4 (SL on 2). |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Mar 12, 2009 11:09 pm Post subject: |
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| Marty R. wrote: | | I don't know that I would've ever seen that. That's the one I played as a Type 4 (SL on 2). |
Marty,
Right. Another way to look at it: The type-4 takes <8> off of ab. Leaving the hidden pair <89> in B5C5.
Keith |
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