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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Jun 12, 2009 4:12 pm Post subject: Set XY_03 Puzzle 016 |
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| You May Need wrote: | | [r7c6]<>9 ... to get around the advanced fish |
| Code: | +-----------------------+
| . 2 . | . . 7 | . . . |
| 6 7 . | 1 . 8 | . 2 . |
| . . 3 | 6 2 . | 7 . 8 |
|-------+-------+-------|
| . 6 5 | 3 8 . | 4 . . |
| . . 2 | 7 4 . | . . . |
| 4 1 . | . . 2 | . . . |
|-------+-------+-------|
| . . 6 | 2 . . | . 4 . |
| . 8 . | . . . | 5 1 . |
| . . 1 | . . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sun Jun 14, 2009 5:55 pm Post subject: |
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| Code: | .------------------------.------------------------.------------------------.
| 589 2 489 | 459 359 7 | 1369 3569 134569 |
| 6 7 49 | 1 359 8 | 39 2 3459 |
| 1 459 3 | 6 2 459 | 7 59 8 |
:------------------------+------------------------+------------------------:
|*79 6 5 | 3 8 1 | 4 *79 2 |
| 389 39 2 | 7 4 569 | 169 5689 1569 |
| 4 1 *789 | 59 569 2 | 369 356789 35679 |
:------------------------+------------------------+------------------------:
| 3579 359 6 | 2 1 359 | 8 4 379 |
| 2 8 *479 | 49 *679 3469 | 5 1 3679 |
| 3579 3459 1 | 8 *5679 34569 | 2 36-79 3679 |
'------------------------'------------------------'------------------------' |
7's...r4c8 = r4c1 - r6c3 = r8c3 - r8c5 = r9c4; r9c8 <> 7
naked quad in row 6
--------------------------------
| Code: | .------------------------.------------------------.------------------------.
|*589 2 489 | 459 359 7 | 1369 3569 134569 |
| 6 7 49 | 1 359 8 | 39 2 3459 |
| 1 *459 3 | 6 2 459 | 7 *59 8 |
:------------------------+------------------------+------------------------:
| 79 6 5 | 3 8 1 | 4 *7-9 2 |
|*389 39 2 | 7 4 569 | 169 5689 1569 |
| 4 1 *78 | 59 569 2 | 369 *78 3569 |
:------------------------+------------------------+------------------------:
| 3579 359 6 | 2 1 359 | 8 4 379 |
| 2 8 479 | 49 679 3469 | 5 1 3679 |
| 3579 3459 1 | 8 5679 34569 | 2 369 3679 |
'------------------------'------------------------'------------------------' |
(9=5)r3c8 - (5)r3c2 = (5-8)r1c1 = (8)r5c1 - (8)r6c3 = (8-7)r6c8 = (7)r4c8; r4c8 <> 9
-------------------------------------
| Code: | .---------------------.---------------------.---------------------.
| 5 2 8 | 49 39 7 | 1369 369 14 |
| 6 7 *49 | 1 359 8 |3-9 2 *45 |
| 1 4-9 3 | 6 2 459 | 7 *59 8 |
:---------------------+---------------------+---------------------:
| 9 6 5 | 3 8 1 | 4 7 2 |
| 8 3 2 | 7 4 69 | 169 569 15 |
| 4 1 7 | 5 69 2 | 369 8 369 |
:---------------------+---------------------+---------------------:
| 37 59 6 | 2 1 359 | 8 4 379 |
| 2 8 49 | 49 67 36 | 5 1 367 |
| 37 459 1 | 8 5679 34569 | 2 369 3679 |
'---------------------'---------------------'---------------------' |
(9=4)r2c3 - (4=5)r2c9 - (5=9)r3c8; r3c2 and r7c3 is not 9 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Jun 14, 2009 6:09 pm Post subject: |
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This puzzle is very difficult ... even with the elimination I provided.
Looking back, I realize that I missed adding a hint about a 2-String Kite in <5> being present. It's not grouped, but it allows an important Naked Quad to occur. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Jun 15, 2009 12:47 pm Post subject: |
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Danny, is this puzzle solvable without a chain?
I found seven moves and hit the wall! I then checked your hit and found that I had made that deletion, but still unable to proceed.
I would appreciate the details if a not-chain solution exists.
Thanks,
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Jun 15, 2009 8:32 pm Post subject: |
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| tlanglet wrote: | Danny, is this puzzle solvable without a chain?
I found seven moves and hit the wall! I then checked your hit and found that I had made that deletion, but still unable to proceed.
I would appreciate the details if a not-chain solution exists.
Thanks,
Ted |
Yes, this puzzle is solvable w/o a chain ... provided you use the hint elimination. It's also a little easier if you perform the elimination first thing. Here's the solution if you wait to perform the elimination.
| Code: | c5b2 Locked Candidate 1 <> 3 [r89c5]
r5 b4 Locked Candidate 1 <> 3 [r5c789]
r39 X-Wing <> 4 [r8c6]
r2c4 2-String Kite <> 5 [r6c9]
r47c1 Skyscraper <> 7 [r6c9],[r9c8]
c9 Naked Quad <> 3679 [r125c9]
r6 Naked Quad <> 3569 [r6c38]
r5 b6 Locked Candidate 1 <> 5 [r5c6]
XY-Wing [r2c9]/[r2c3]+[r3c8] <> 9 [r2c7],[r3c2]
XY-Wing [r2c3]/[r2c5]+[r3c2] <> 5 [r3c6]
c6b8 Locked Candidate 2 <> 5 [r9c5]
XY-Wing [r3c6]/[r3c2]+[r7c6] <> 5 [r7c2]
c2 Naked Pair <> 39 [r9c2]
r4 b3 Empty Rectangle <> 9 [r1c1]
finned Franken Swordfish r34b7\c168 <> 9 [r7c6]
XYZ-Wing [r7c1]/[r4c1]+[r7c2] <> 9 [r9c1]
b7 Naked Triple <> 457 [r7c1]
XYZ-Wing [r9c6]/[r8c4]+[r9c9] <> 9 [r9c5]
<39> UR Type 1 [r57c12] <> 39 [r5c1]
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Obviously, alternate steps may be available, and even preferable, to those I listed. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Jun 16, 2009 4:52 pm Post subject: |
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I'm stuck here, after some ERs (7, 4), W-Wing (49) and a kite (5).
| Code: |
+---------------+----------------+------------------+
| 589 2 489 | 459 359 7 | 1369 3569 134569 |
| 6 7 49 | 1 359 8 | 39 2 3459 |
| 1 459 3 | 6 2 459 | 7 59 8 |
+---------------+----------------+------------------+
| 79 6 5 | 3 8 1 | 4 79 2 |
| 389 39 2 | 7 4 69 | 169 5689 1569 |
| 4 1 78 | 59 569 2 | 369 78 369 |
+---------------+----------------+------------------+
| 3579 359 6 | 2 1 359 | 8 4 379 |
| 2 8 47 | 49 679 369 | 5 1 3679 |
| 3579 3459 1 | 8 5679 34569 | 2 369 3679 |
+---------------+----------------+------------------+
|
Play this puzzle online at the Daily Sudoku site |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Jun 16, 2009 11:19 pm Post subject: |
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| Marty R. wrote: | I'm stuck here, after some ERs (7, 4), W-Wing (49) and a kite (5).
| Code: |
+---------------+----------------+------------------+
| 589 2 489 | 459 359 7 | 1369 3569 134569 |
| 6 7 49 | 1 359 8 | 39 2 3459 |
| 1 459 3 | 6 2 459 | 7 59 8 |
+---------------+----------------+------------------+
| 79 6 5 | 3 8 1 | 4 79 2 |
| 389 39 2 | 7 4 69 | 169 5689 1569 |
| 4 1 78 | 59 569 2 | 369 78 369 |
+---------------+----------------+------------------+
| 3579 359 6 | 2 1 359 | 8 4 379 |
| 2 8 47 | 49 679 369 | 5 1 3679 |
| 3579 3459 1 | 8 5679 34569 | 2 369 3679 |
+---------------+----------------+------------------+
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Play this puzzle online at the Daily Sudoku site |
| Highlight from the Left wrote: | Locked Candidate 2, Naked Quad, XY-Wing, XY-Wing, Locked Candidate 2, XY-Wing, Naked Pair, [r7c6]<>9, more ...
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jun 17, 2009 3:48 am Post subject: |
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| Quote: | | Locked Candidate 2, Naked Quad, XY-Wing, XY-Wing, Locked Candidate 2, XY-Wing, Naked Pair, [r7c6]<>9, more ... |
I don't understand. Right off the bat I see Locked Candidate 2, but all 2s are solved.  |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Jun 17, 2009 4:40 am Post subject: |
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| Marty R. wrote: | | Quote: | | Locked Candidate 2, Naked Quad, XY-Wing, XY-Wing, Locked Candidate 2, XY-Wing, Naked Pair, [r7c6]<>9, more ... |
I don't understand. Right off the bat I see Locked Candidate 2, but all 2s are solved. |
Locked Candidate 2 is a technique ... just like Naked Quad and XY-Wing
In this case:
| Code: | Locked Candidate 2 on <9>
Naked Quad on <3679>
...
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jun 17, 2009 5:15 am Post subject: |
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OK, thanks, but I don't know what a Locked Candidate 2 is as opposed to a Locked Candidate, aka Box-Line Interaction. But I see the 9s in column 3 are confined to box 1. I'm regressing to the level of a beginner when I start missing basics.  |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Jun 17, 2009 6:02 am Post subject: |
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| Marty R. wrote: | | OK, thanks, but I don't know what a Locked Candidate 2 is as opposed to a Locked Candidate, aka Box-Line Interaction. But I see the 9s in column 3 are confined to box 1. I'm regressing to the level of a beginner when I start missing basics. |
My memory is swiss cheese anymore, so I have notes all over the place to help me. That's assuming, of course, that I can remember which notes file has the information ... or that I ever made a note about it!
Here's an entry that I tracked down:
| Code: | box-to-line => Pointing => Locked Candidate (1)
line-to-box => Claiming => Locked Candidate (2)
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I'm lazy and often disregard the parens.
Note: I expected this puzzle to qualify as a BBDB ... and not a nightmare. Sorry!!! |
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