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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Wed Aug 25, 2010 4:27 am Post subject: Puzzle 10/08/25: C |
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| Code: | +-----------------------+
| . 7 . | . . . | 5 . . |
| 6 . . | . . 9 | . . 8 |
| . . 5 | 1 . 4 | . . . |
|-------+-------+-------|
| . . 7 | 6 . 8 | 3 . . |
| . . . | . 2 . | . . . |
| 2 3 9 | 4 . 5 | . . . |
|-------+-------+-------|
| 4 . . | 2 . . | 8 5 . |
| . . . | . . . | 4 2 . |
| . 6 . | . . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Wed Aug 25, 2010 9:03 am Post subject: |
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| Quote: | 6-SIS AIC : (13)R7C3 (39)R7C5 (91)R4C5 1C1 (48)R5C2 8B1 : (1)r7c3=(8)r1c3 : => r1c3<>1
XY Wing (1-79) : (79)R5C4 (91)R5C7 (17)R6C9 : => r5c8,r6c5<>7 ... Or ... BUG+2 : [(9)r5c8,(5)r8c4] (58)R8C2 (84)R5C2 : => r5c8<>4
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Aug 25, 2010 9:28 am Post subject: |
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I needed three steps for this fun puzzle.
| Quote: | kite(8) ; r8c5<>8
m-wing(95) with pseudocell ; (9=1)r4c5-(1=5)r4c1 - r9c1=(5-9)r8c2=r7c2 ; r7c5<>9
xy-wing(79-1) r5c4 ; r6c9<>1 |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Aug 25, 2010 11:56 am Post subject: |
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| JC Van Hay wrote: | | Quote: | 6-SIS AIC : (13)R7C3 (39)R7C5 (91)R4C5 1C1 (48)R5C2 8B1 : (1)r7c3=(8)r1c3 : => r1c3<>1
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JC, have you played a turbot/colouring move on 8 to get to this point i.e. SSTS? As I don't have (39)r7c5 otherwise? |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Wed Aug 25, 2010 3:48 pm Post subject: |
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Peter, you are right. I didn't double check this puzzle. My notes effectively contain a Grouped Skyscraper on 8 : (8)C35 : => r1c4<>8 between UP36 and UP42. Mea culpa.
JC |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Aug 25, 2010 4:29 pm Post subject: |
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I had a great time jumping off into the deep end of this puzzle including a couple of "almost hidden triples" and an almost xyz-wing which were great fun but seemingly useless.
AHT(379)r3c179=(2)r3c7-(2=8)r3c2-r5c2=r5c1-r9c1=r9c4-(8=3)r1c4-r1c1=(3)r3c1; r3c58<>3
AXYZ-wing (179)r5c7 with fin (3)r5c4
IF xyz-wing is true r5c8<>7
If fin is true (3)r5c4-(3=8)r1c4-r1c3=r3c2-r5c2=(8-1)r5c1=r4c1-r4c5=r6c5-(1=7)r6c9; r5c8<>7
AHT(136)r8c369=(8)r8c3-r1c3=r3c2-r5c2=(8-1)r5c1=r4c1-r4c5=(1)r6c5; r8c5<>1
AHT(136)r8c369=(8)r8c3-r8c45=r9c4-(8=3)r1c4; r8c4<>3
ER 8 SL r18c3 hinge box2; r8c5<>8
AIC found extending the vertex of a potential xy-wing: (3=8)r8c3-(8=5)r9c1-(5=1)r4c1-(1=9)r4c5-(9=3)r7c5; r7c3<>3
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Aug 26, 2010 10:30 pm Post subject: |
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Coloring on 8; r8c5<>8. This was Peter's Kite, but I only had two 8s in box 1 so it was simple coloring.
All the DP killers for a potential 19 DP in boxes 69 solved three cells in common in box 7.
Take your choice, BUG+2 or XY-Wing (197). |
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