| View previous topic :: View next topic |
| Author |
Message |
daj95376
Joined: 23 Aug 2008
Posts: 3854
|
 Posted: Mon May 04, 2009 9:33 am Post subject: Puzzle NR_008 |
 |
|
| Code: | +-----------------------+
| . . . | 1 . . | . . . |
| . . . | . 3 2 | . 9 . |
| . . 4 | 6 5 9 | . . 8 |
|-------+-------+-------|
| 5 . 1 | 3 . . | . 7 9 |
| . 8 9 | . 1 . | 6 3 . |
| . 7 2 | . . . | . . . |
|-------+-------+-------|
| . . . | . 6 . | 8 . . |
| . 4 . | 9 8 . | . 6 . |
| . . 8 | 2 . . | . . . |
+-----------------------+
|
Play this puzzle online at the Daily Sudoku site |
|
| Back to top |
|
 |
tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
|
| Posted: Mon May 04, 2009 2:11 pm Post subject: |
|
|
I ignored the three obvious URs, and solved the puzzle with: | Quote: | a xy-wing 457 with pivot 47 at r9c5,
a kite on 5 with hinge in box3,
and another xy-wing 123 with pivot 13 in r9c2
|
Ted |
|
| Back to top |
|
|
keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
|
| Posted: Tue May 05, 2009 12:12 am Post subject: |
|
|
Ignoring the UR:
Two XY-wings, a skyscraper on 2, another XY-wing.
Keith |
|
| Back to top |
|
|
Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
|
| Posted: Fri May 08, 2009 1:10 am Post subject: |
|
|
| I used Ted's three moves but that was after I used the two Type 1 URs. |
|
| Back to top |
|
|
tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
|
| Posted: Fri May 08, 2009 1:39 am Post subject: |
|
|
| Marty R. wrote: | | I used Ted's three moves but that was after I used the two Type 1 URs. |
I am always amazed at what moves are critical/useful. When working on this puzzle, I assumed that the two URs would be useful, but apparently not!
Ted |
|
| Back to top |
|
|
gindaani
Joined: 06 Mar 2009
Posts: 79
|
| Posted: Fri May 08, 2009 10:42 pm Post subject: |
|
|
| tlanglet wrote: | I ignored the three obvious URs, and solved the puzzle with: | Quote: | a xy-wing 457 with pivot 47 at r9c5,
a kite on 5 with hinge in box3,
and another xy-wing 123 with pivot 13 in r9c2
|
Ted |
| keith wrote: | Ignoring the UR:
Two XY-wings, a skyscraper on 2, another XY-wing.
Keith |
I must have missed something in the basics. After the basics, the only move I see is the 475 xy-wing with pivot r9c5. After the xy-wing, I have:
| Code: |
+-------------+-------------+-------------+
| 8 9 35 | 1 47 47 | 235 25 6 |
| 17 15 6 | 8 3 2 | 57 9 4 |
| 27 23 4 | 6 5 9 | 37 1 8 |
+-------------+-------------+-------------+
| 5 6 1 | 3 2 8 | 4 7 9 |
| 4 8 9 | 57 1 57 | 6 3 2 |
| 3 7 2 | 4 9 6 | 15 8 15 |
+-------------+-------------+-------------+
| 9 1235 357 | 57 6 13457 | 8 24 137 |
| 12 4 357 | 9 8 1357 | 125 6 1357 |
| 6 135 8 | 2 47 1347 | 9 45 1357 |
+-------------+-------------+-------------+
|
Play this puzzle online at the Daily Sudoku site
I don't see the kite with hinge in box 3 (the <5> in r1c7 prevents the kite). I also do not see another xy-wing. I see skyscrapers on 2, but they don't make any eliminations.
What am I missing?
I can eliminate the 5 from r1c7 using advanced coloring, but I don't see any easy way to remove it. After the AC, I still don't see another xy-wing, but the kite is there (and the 132 xy-wing finishes it off).
My solution then:
475 xy-wing
Advanced Coloring [ (5=3)r1c3 - (3=2)r3c2 - (2)r7c2 = (2)r7c8 - (2=5)r1c8 ]
kite on 5
132 xy-wing |
|
| Back to top |
|
|
tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
|
| Posted: Sat May 09, 2009 12:13 am Post subject: |
|
|
| gindaani wrote: | | tlanglet wrote: | I ignored the three obvious URs, and solved the puzzle with: | Quote: | a xy-wing 457 with pivot 47 at r9c5,
a kite on 5 with hinge in box3,
and another xy-wing 123 with pivot 13 in r9c2
|
Ted |
I must have missed something in the basics. After the basics, the only move I see is the 475 xy-wing with pivot r9c5. After the xy-wing, I have:
| Code: |
+-------------+-------------+-------------+
| 8 9 35 | 1 47 47 | 235 25 6 |
| 17 15 6 | 8 3 2 | 57 9 4 |
| 27 23 4 | 6 5 9 | 37 1 8 |
+-------------+-------------+-------------+
| 5 6 1 | 3 2 8 | 4 7 9 |
| 4 8 9 | 57 1 57 | 6 3 2 |
| 3 7 2 | 4 9 6 | 15 8 15 |
+-------------+-------------+-------------+
| 9 1235 357 | 57 6 13457 | 8 24 137 |
| 12 4 357 | 9 8 1357 | 125 6 1357 |
| 6 135 8 | 2 47 1347 | 9 45 1357 |
+-------------+-------------+-------------+
|
Play this puzzle online at the Daily Sudoku site
I don't see the kite with hinge in box 3 (the <5> in r1c7 prevents the kite). |
The <5> in r1c7 does not prevent the kite. If r1c7=5 then both pincers r2c2 and r9c8 must be true and the 5 in r9c2 is deleted. If a 5 exists in the intersection cell of the two strong links forming the kite, which is this case would be cell r2c8, then the kite is destroyed.
Ted |
|
| Back to top |
|
|
gindaani
Joined: 06 Mar 2009
Posts: 79
|
| Posted: Sat May 09, 2009 1:02 am Post subject: |
|
|
| tlanglet wrote: | | The <5> in r1c7 does not prevent the kite. If r1c7=5 then both pincers r2c2 and r9c8 must be true and the 5 in r9c2 is deleted. If a 5 exists in the intersection cell of the two strong links forming the kite, which is this case would be cell r2c8, then the kite is destroyed. |
I see it now. It would prevent the kite in the other direction, not the one that eliminates 5 in r9c2.
Thanks! I knew I was missing something. |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
