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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Mon Feb 15, 2016 8:00 pm Post subject: Free Press Thu 17 Dec 2015 |
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The Free Press puzzles have gotten much more interesting. Now, the Thu and Sun puzzles often need advanced moves, while the Fri one needs chains.
| Code: | +-------+-------+-------+
| . . 7 | . . . | 9 5 . |
| . . . | . 1 . | . . . |
| . . . | . . 7 | . 3 2 |
+-------+-------+-------+
| . 3 . | . . . | 4 1 . |
| 7 . . | 6 . 2 | . . 8 |
| . 9 5 | . . . | . 7 . |
+-------+-------+-------+
| 3 4 . | 9 . 5 | . . . |
| . . . | . 2 8 | . . . |
| . . 9 | . . . | 6 . . |
+-------+-------+-------+ |
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Feb 15, 2016 9:45 pm Post subject: |
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| Code: |
+-------------+------------+----------+
| 1 28 7 | 238 38 6 | 9 5 4 |
| 9 25 3 | 25 1 4 | 8 6 7 |
| 4 568 68 | 58 9 7 | 1 3 2 |
+-------------+------------+----------+
| 268 3 268 | 78 578 9 | 4 1 56 |
| 7 1 4 | 6 35 2 | 35 9 8 |
| 68 9 5 | 14 348 13 | 2 7 36 |
+-------------+------------+----------+
| 3 4 28 | 9 6 5 | 7 28 1 |
| 56 67 1 | 37 2 8 | 35 4 9 |
| 258 78 9 | 14 347 13 | 6 28 35 |
+-------------+------------+----------+
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Play this puzzle online at the Daily Sudoku site
This one's a Thursday, so presumably an advanced move could do it, but I didn't find it, so here's my chain.
(7=6)r8c2-(6=5)r8c1-(5=3)r8c7-r5c7=r5c5-(3=1487)b5p7891=> -7r8c4
P.S. A note on the notation of the last term, which I haven't yet seen on this forum. b=box, p=point or position, referring to the position of the cells in the box, 1-9 going left to right and down. This is an excellent shortcut for an ALS within a box. |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Mon Feb 15, 2016 9:59 pm Post subject: |
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Just for the fun :
| Code: | +-------------------+--------------+---------------+
| 1 28 7 | 238 38 6 | 9 5 4 |
| 9 25 3 | 25 1 4 | 8 6 7 |
| 4 568 68 | 58 9 7 | 1 3 2 |
+-------------------+--------------+---------------+
| (268) 3 (268) | 78 578 9 | 4 1 56 |
| 7 1 4 | 6 35 2 | 35 9 8 |
| 8(-6) 9 5 | 14 348 13 | 2 7 36 |
+-------------------+--------------+---------------+
| 3 4 (28) | 9 6 5 | 7 (28) 1 |
| (56) 67 1 | 37 2 8 | 35 4 9 |
| (258) 78 9 | 14 347 13 | 6 (28) 35 |
+-------------------+--------------+---------------+ |
In order to avoid the unresolvable loop (28)r4c13,r7c38,r9c18 : [6r4c13=5r9c1-(5=6)r8c1]-(6=8)r6c1; stte
Analysis of the puzzle from B6 gives :
| Code: | +---------------+-----------------+--------------+
| 1 28 7 | 238 38 6 | 9 5 4 |
| 9 25 3 | 25 1 4 | 8 6 7 |
| 4 568 68 | 58 9 7 | 1 3 2 |
+---------------+-----------------+--------------+
| 268 3 268 | 78 8(57) 9 | 4 1 56 |
| 7 1 4 | 6 3(5) 2 | 3-5 9 8 |
| 68 9 5 | 14 348 13 | 2 7 36 |
+---------------+-----------------+--------------+
| 3 4 28 | 9 6 5 | 7 28 1 |
| 56 67 1 | (37) 2 8 | (35) 4 9 |
| 258 78 9 | 14 34(7) 13 | 6 28 35 |
+---------------+-----------------+--------------+
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ALS-Wing[5r8c7=7r8c4-7r9c5=(7-5)r4c5=5r5c5]-(5=3)r5c7; stte of a unique solution |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue Feb 16, 2016 1:39 pm Post subject: |
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JC,
There's a remote pair (35) not needed.
There's an X-wing on 3 in C69 that reveals an XY-wing 4-78 that solves it.
Keith |
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Tue Feb 16, 2016 2:25 pm Post subject: |
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| Darn x wings! There ought be a law against them. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue Feb 16, 2016 2:59 pm Post subject: |
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| dongrave wrote: | | Darn x wings! There ought be a law against them. |
At least we should admit they're a fish and not a wing.
Keith |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Tue Feb 16, 2016 3:31 pm Post subject: |
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Another (and simpler) optimized solution suggested by the analysis of the puzzle from B6 :
23 singles
Pointing{5B2} -> -5r4c4
HP{1C4, 4C4} -> -(378)r69c4
| Code: | +----------------+------------------+------------+
| 1 28 7 | 238 38 6 | 9 5 4 |
| 9 25 3 | 25 1 4 | 8 6 7 |
| 4 568 68 | 58 9 7 | 1 3 2 |
+----------------+------------------+------------+
| 268 3 268 | (78) 58(7) 9 | 4 1 56 |
| 7 1 4 | 6 35 2 | 35 9 8 |
| 68 9 5 | 14 3-8(4) 13 | 2 7 36 |
+----------------+------------------+------------+
| 3 4 28 | 9 6 5 | 7 28 1 |
| 56 567 1 | 37 2 8 | 35 4 9 |
| 258 2578 9 | 14 3(47) 13 | 6 28 35 |
+----------------+------------------+------------+
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Wing{4C5, 7C5, (78)r4c4} -> -8r6c5; stte |
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