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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Thu Sep 23, 2010 4:09 am Post subject: Puzzle 10/09/23: B |
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| Code: | +-----------------------+
| . . . | . . . | . 2 9 |
| . 5 . | 8 . . | . . 3 |
| . . 7 | . 5 . | 6 4 . |
|-------+-------+-------|
| . 3 . | 1 . . | . 5 . |
| . . 8 | . 2 . | . 6 . |
| . . . | . . 7 | . . . |
|-------+-------+-------|
| . . 5 | . . . | 8 1 6 |
| 6 . 1 | 4 8 . | 2 . . |
| 8 7 . | . . . | 4 . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Thu Sep 23, 2010 5:45 pm Post subject: |
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Two steps - with a loop
| Quote: | xy-wing(12-4) with SL(4) across pincers to produce a continuous loop ;
(4=2)r2c1 - (2=1)r3c2 - (1=4)r5c2 - r7c2=r7c1 - loop ; r14c1<>4, r2c3<>2
xy-wing(17-3) r1c5 ; r7c1<>3 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Thu Sep 23, 2010 9:37 pm Post subject: |
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I also used xy-wings, only many more than Peter.
| Quote: | xy-wing 12-4 vertex (12)r3c2; r4c1<>4
xy-wing 27-9 vertex (27)r4c1; r4c3,r6c7<>9
xy-wing 1-24 vertex (14)r5c2; r3c2<>2
AIC found looking for another xy-wing: (6=7)r1c4-(7=1)r1c5-(1=3)r9c5-(3=2)r9c3-(2=4)r4c3-(4=6)r2c3; r2c6<>6
xy-wing -234 vertex r1c3; r7c1<>2
Flightless xy-wing: (2)r2c6=(2)r2c1-"xy-wing r35c2|r4c3"[(2)r3c2=(2)r4c3]-(2)r9c3=(2)r7c2; r7c6<>2
BUG+2:(2=4)r2c1-BUG+2[(4)r1c1=(1)r1c6]-(1=2)r3c6; r2c6,r3c2<>2 |
I am not sure about my notation regarding the incorporation of patterns within an AIC. Any suggestions are always appreciated.
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Sep 24, 2010 12:53 am Post subject: |
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My apologies to everyone stuck working this puzzle!!! While searching for a single-stepper solution, I messed up my recordkeeping and lost track of the number of steps originally returned by my solver.
I completed the addition of S-Wing and "unnamed 3-SIS" to my solver and became distracted when I discovered that the latter AIC cracks the puzzle after basics -- but not M-Wing, W-Wing, nor S-Wing.
| Code: | after basics
+-----------------------------------------------------+
| *134 8 346 | 67 @17 146 | 5 2 9 |
| 24 5 246 | 8 9 246 | 1 7 3 |
| 9 12 7 | 23 5 123 | 6 4 8 |
|-----------------+-----------------+-----------------|
| 247 3 249 | 1 6 8 | 79 5 24 |
| 57 14 8 | 359 2 39 | 379 6 14 |
| 125 6 29 | 359 4 7 | 39 8 12 |
|-----------------+-----------------+-----------------|
| *234 24 5 | 279 37 29 | 8 1 6 |
| 6 9 1 | 4 8 5 | 2 3 7 |
| 8 7 *23 | 26 @13* 126 | 4 9 5 |
+-----------------------------------------------------+
# 50 eliminations remain
unnamed 3-SIS : 3C1 3R9 1C5 : (3)r1c1 = r7c1 - r9c3 = (3-1)r9c5 = (1)r1c5 => r1c1<>1
______________________________________________________________________________________
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I refuse to say, "flightless Kite ...". _  _ |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Sep 24, 2010 2:04 pm Post subject: |
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| daj95376 wrote: | | My apologies to everyone stuck working this puzzle!!! While searching for a single-stepper solution, I messed up my recordkeeping and lost track of the number of steps originally returned by my solver. |
Danny I for one did not feel "stuck" working this puzzle. After the first couple of xy-wings, I intentionally only looked for more xy-wings. Overall I enjoyed the puzzle very much, even after reading the post by Peter where he used my first xy-wing to make a loop.
| daj95376 wrote: | | I refuse to say, "flightless Kite ...". _ _ |
Danny, when I was a young boy I used to make my own kites and many did not fly or went straight up and then straight down to crash. So I now have fond memories of "flightless kites" and think it is an appropriate name for your 3-SIS pattern.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Sep 24, 2010 7:52 pm Post subject: |
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No apologies needed, Danny.
M-Wing (29)
XY-Loop, r9c6<>2
AIC, r3c6<>1 |
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