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SudoQ
Joined: 02 Aug 2011
Posts: 127
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 Posted: Thu Dec 29, 2011 5:16 pm Post subject: |
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r6c9=2 -> no space for 7 in c4 (via r3, r8 and c1)
/SudoQ |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 30, 2011 12:48 am Post subject: |
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| This gave me a load of trouble. After a half-dozen moves all I could do was Medusa my way out of it. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Dec 30, 2011 1:50 am Post subject: |
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After basics: | Code: | +-------------------+-------------------+-------------------+
| 8 13 156 |-25679 259 25679 | 4 @237 -257 |
| 56 7 9 |#256 4 3 |@25 8 1 |
| 35 2 4 | 57 1 8 | 6 37 9 |
+-------------------+-------------------+-------------------+
| 4 6 57 | 8 259 259 | 257 1 3 |
| 235 13 15 |-256 7 256 | 9 4 8 |
| 257 9 8 | 1 3 4 | 257 6 25 |
+-------------------+-------------------+-------------------+
| 1 5 2 | 3 6 79 | 8 79 4 |
| 679 4 67 |#279 8 1 | 3 5 $267 |
| 679 8 3 | 4 259 2579 | 1 $279 -267 |
+-------------------+-------------------+-------------------+ |
I find one of these a year, which is a relief since there are only two days left!
A really twisted franken swordfish.
Note the strong links on 2 in R2, R8, C8. They make a cycle. Any cell that sees both cells labelled @, or #, or $ cannot be 2.
For the rest of the puzzle, I don't know. But, I may stay at a Holiday Inn Express tonight!
Keith  |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Dec 30, 2011 3:06 am Post subject: |
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Not pretty. | Code: | skyscraper 7 => r1c6,r8c4<>7
*--------------------------------------------------------------------*
| 8 a13 156 |f25679 259 2569 | 4 b27-3 257 |
| 56 7 9 | 256 4 3 | 25 8 1 |
| 5-3 2 4 |g57 1 8 | 6 h37 9 |
|----------------------+----------------------+----------------------|
| 4 6 57 | 8 259 259 | 257 1 3 |
| 235 13 15 | 256 7 256 | 9 4 8 |
| 257 9 8 | 1 3 4 | 257 6 25 |
|----------------------+----------------------+----------------------|
| 1 5 2 | 3 6 79 | 8 79 4 |
| 679 4 67 |e29 8 1 | 3 5 d267 |
| 679 8 3 | 4 259 2579 | 1 c279 267 |
*--------------------------------------------------------------------*
aic
(3)r1c2=(3-2)r1c8=(2)r9c8-(2)r8c9=(2-9)r8c4=(9-7)r1c4=(7)r3c4-(7=3)r3c8 => r1c8,r3c1<>3 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Dec 30, 2011 5:15 am Post subject: |
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This puzzle has several extraneous eliminations. I was afraid they might create a lot of frustration.
| Hint wrote: | Sashimi X-Wings (plural!).
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Keith (nice find!): mutant Swordfish r28c8\c4b39 |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Fri Dec 30, 2011 8:44 am Post subject: |
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| Code: | +--------------+----------------------+--------------------+
| 8 13 156 | 56-2(79) 259 25679 | 4 7-3(2) 257 |
| 56 7 9 | 256 4 3 | 25 8 1 |
| 35 2 4 | 5(7) 1 8 | 6 (37) 9 |
+--------------+----------------------+--------------------+
| 4 6 57 | 8 259 259 | 257 1 3 |
| 235 13 15 | 256 7 256 | 9 4 8 |
| 257 9 8 | 1 3 4 | 257 6 25 |
+--------------+----------------------+--------------------+
| 1 5 2 | 3 6 79 | 8 79 4 |
| 679 4 67 | (279) 8 1 | 3 5 67(2) |
| 679 8 3 | 4 259 2579 | 1 79(2) 267 |
+--------------+----------------------+--------------------+
(3=7)r3c8-AHP(7r3c4=79r18c4)-Kite(2r8c4=r8c9-r9c8=r1c8) : -3r1c8, -2r1c4; stte |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Dec 30, 2011 4:25 pm Post subject: |
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JC: Thanks for the "Kite" reference to explain r1c4<>2 as an embedded elimination in the AIC.
The best description of my solver's solution for this puzzle? ... extraneous.
2X Sashimi X-Wing and a W-Wing.
| Code: | c7b6 Locked Candidate 2 <> 7 r6c9 extraneous
+-----------------------------------------------------------------------+
| 8 13 156 | 25679 259 25679 | 4 237 257 |
| 56 7 9 | 256 4 3 | 25 8 1 |
| 35 2 4 | 57 1 8 | 6 37 9 |
|-----------------------+-----------------------+-----------------------|
| 4 6 57 | 8 259 259 | 257 1 3 |
| 235 13 15 | 256 7 256 | 9 4 8 |
| 257 9 8 | 1 3 4 | 257 6 25 |
|-----------------------+-----------------------+-----------------------|
| 1 5 2 | 3 6 79 | 8 79 4 |
| 679 4 67 | 279 8 1 | 3 5 267 |
| 679 8 3 | 4 259 2579 | 1 279 267 |
+-----------------------------------------------------------------------+
# 64 eliminations remain
r24\c47 Sashimi X-Wing <> 2 r5c4
c39\r16 Sashimi X-Wing <> 5 r6c1
r28c4 Skyscraper <> 2 r1c9 extraneous
r8c8 2-String Kite <> 2 r1c4 extraneous
r37c8 Skyscraper <> 7 r8c4,r1c6 extraneous
r6 b6 Locked Candidate 2 <> 5 r4c7 extraneous
<37+5> XY-Wing r3c8/r1c9+r3c1 <> 5 r1c3 extraneous
c1b1 Locked Candidate 1 <> 5 r5c1 extraneous
<15+6> XY-Wing r5c3/r1c3+r5c4 <> 6 r1c4 extraneous
+--------------------------------------------------------------+
| 8 13 16 | 579 259 2569 | 4 237 57 |
| 56 7 9 | 256 4 3 | 25 8 1 |
| 35 2 4 | 57 1 8 | 6 37 9 |
|--------------------+--------------------+--------------------|
| 4 6 57 | 8 259 259 | 27 1 3 |
| 23 13 15 | 56 7 256 | 9 4 8 |
| 27 9 8 | 1 3 4 | 257 6 25 |
|--------------------+--------------------+--------------------|
| 1 5 2 | 3 6 79 | 8 79 4 |
| 679 4 67 | 29 8 1 | 3 5 267 |
| 679 8 3 | 4 259 2579 | 1 279 267 |
+--------------------------------------------------------------+
# 54 eliminations remain
W-Wing (6=5)r2c1 - r3c1 = r3c4 - (5=6)r5c4 => r2c4<>6
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Regards, Danny |
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oaxen
Joined: 10 Jul 2006
Posts: 96
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| Posted: Tue Jan 03, 2012 10:45 am Post subject: |
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Nice to see that yoyu are back in business Danny. I have missed your forum for a very long time. So please go on and post, I like to start everyday with one of your puzzles
Lars |
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