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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Jul 03, 2010 4:51 am Post subject: Puzzle 10/07/03: BBDB turbot |
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| Code: | +-----------------------+
| 1 . 2 | . 4 7 | 6 5 . |
| . . . | . . . | 4 . 9 |
| 3 . 6 | . . . | . . . |
|-------+-------+-------|
| . . . | 4 . . | . . . |
| 2 . . | . 6 . | 1 . 5 |
| 5 . . | . . 2 | . . 4 |
|-------+-------+-------|
| 9 2 . | . 3 . | 8 4 6 |
| 6 . . | . . . | 5 . . |
| . 5 . | . 7 6 | 3 . 2 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Code: | after basics
+-----------------------------------------------------------------------+
| 1 9 2 | 38 4 7 | 6 5 38 |
| 78 78 5 | 6 12 13 | 4 123 9 |
| 3 4 6 | 12589 12589 1589 | 27 1278 178 |
|-----------------------+-----------------------+-----------------------|
| 78 13678 1389 | 4 158 1358 | 279 23678 378 |
| 2 378 4 | 3789 6 389 | 1 378 5 |
| 5 13678 1389 | 1378 18 2 | 79 3678 4 |
|-----------------------+-----------------------+-----------------------|
| 9 2 7 | 15 3 15 | 8 4 6 |
| 6 138 138 | 289 289 4 | 5 179 17 |
| 4 5 18 | 89 7 6 | 3 19 2 |
+-----------------------------------------------------------------------+
# 86 eliminations remain
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Jul 03, 2010 1:37 pm Post subject: |
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One step....
| Quote: | Almost flightless xy-wing 23-8 with vertex in r2c8 and fin (1)r2c8
If flightless xy-wing is true: transport: (8)r6c5-r45c6=(8)r3c6; r3c89<>8
If fin is true: (1)r2c8-r3c9=r8c9-(1=9)r9c8-(9=8)r9c4-r1c4=(8)r1c9; r3c89<>8 |
Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Jul 03, 2010 3:26 pm Post subject: |
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Three turbot steps...
| Quote: | kite(3); r4c6<>3
type 1 ur(15); r3c6<>15
xy-wing(89-3) r3c6; r2c6<>3, r56c4<>3 |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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| Posted: Sat Jul 03, 2010 5:16 pm Post subject: |
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| tlanglet wrote: | One step....
| Quote: | Almost flightless xy-wing 23-8 with vertex in r2c8 and fin (1)r2c8
If flightless xy-wing is true: transport: (8)r6c5-r45c6=(8)r3c6; r3c89<>8
If fin is true: (1)r2c8-r3c9=r8c9-(1=9)r9c8-(9=8)r9c4-r1c4=(8)r1c9; r3c89<>8 |
Ted |
Howya been, Ted?
I must have cobwebs in my head this AM. I shd be able to find an xy-wing given the vertex, but somehow I cannot. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Jul 03, 2010 5:30 pm Post subject: |
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Luke
I couldn't find it either but concluded it was an extended wing - making this an "finned flightless extended xy-wing with pincer transport".
The extension is (2=1)r2c5-(1=8)r6c5... looks more like an xy-chain to me! |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Jul 03, 2010 7:00 pm Post subject: |
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| Luke451 wrote: | | tlanglet wrote: | One step....
| Quote: | Almost flightless xy-wing 23-8 with vertex in r2c8 and fin (1)r2c8
If flightless xy-wing is true: transport: (8)r6c5-r45c6=(8)r3c6; r3c89<>8
If fin is true: (1)r2c8-r3c9=r8c9-(1=9)r9c8-(9=8)r9c4-r1c4=(8)r1c9; r3c89<>8 |
Ted |
Howya been, Ted?
I must have cobwebs in my head this AM. I shd be able to find an xy-wing given the vertex, but somehow I cannot. |
Sorry about Luke; I guess I should have IDed the pincers. In any case, the pincers are (38)r1c9 and pincer (28 ) is a pseudocell in r26c5. (Keith introduced me the the notion of a pseudocell pincer.)
The pseudocell pincer is transported to obtain the xy-wing deletions, and then the fin (1) is considered to determine the deletions it provides.
Ted |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Jul 03, 2010 7:03 pm Post subject: |
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| peterj wrote: | Luke
I couldn't find it either but concluded it was an extended wing - making this an "finned flightless extended xy-wing with pincer transport".
The extension is (2=1)r2c5-(1=8)r6c5... looks more like an xy-chain to me! |
Peter, you are correct. The pseudocell pincer (28 ) is simply a two cell chain.
Ted |
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dejsmith
Joined: 23 Oct 2005
Posts: 42
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| Posted: Sat Jul 03, 2010 9:44 pm Post subject: |
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Peter, I have a more basic question. Can you explain your Type 1 UR(15)? I see a Type 1 UR (78); r4c2<>78; but it appears to me, from Danny's candidates profiles, there are too many other possibilties for 15. Assuming you are correct, though, then I see a W Wing (89), but I do not see your XY Wing. So, I guess I need an explanation for that too. Sorry if this is too basic for you, but thanks.
Dave
PS I have been around a while, but am usually at least a week behind; so that is why I do not write often.
PPS I really enjoy Danny's puzzles (& do not even bother with Sam's Very Hards anymore) & the contributions of all of you guys'. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Jul 03, 2010 10:10 pm Post subject: |
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| dejsmith wrote: | Can you explain your Type 1 UR(15)? I see a Type 1 UR (7 ; r4c2<>78; but it appears to me, from Danny's candidates profiles, there are too many other possibilties for 15. Assuming you are correct, though, then I see a W Wing (89), but I do not see your XY Wing. So, I guess I need an explanation for that too. Sorry if this is too basic for you, but thanks. |
After the Kite and some more basics I have this grid..
| Code: | *---------------------------------------------------------------------*
| 1 9 2 | b38 4 7 | 6 5 38 |
| 78 78 5 | 6 12 13 | 4 123 9 |
| 3 4 6 |*15 12589 a89-*15 | 27 1278 178 |
|----------------------+-----------------------+----------------------|
| 78 13678 1389 | 4 158 158 | 279 23678 378 |
| 2 378 4 | 379 6 c39 | 1 378 5 |
| 5 13678 1389 | 37 18 2 | 79 3678 4 |
|----------------------+-----------------------+----------------------|
| 9 2 7 | *15 3 *15 | 8 4 6 |
| 6 138 138 | 2 89 4 | 5 179 17 |
| 4 5 18 | 89 7 6 | 3 19 2 |
*---------------------------------------------------------------------* |
The UR is marked with * and it immediately exposes the xy-wing marked abc.
Welcome! |
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dejsmith
Joined: 23 Oct 2005
Posts: 42
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| Posted: Sun Jul 04, 2010 11:12 pm Post subject: |
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Peter
Doh! It's been a while since I've missed a triple which opened up in box 5 because of the kite elimination. Thanks again.
Dave |
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