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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Jul 17, 2010 5:24 am Post subject: Puzzle 10/07/17: BBDB Advanced |
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| Code: | +-----------------------+
| . 7 . | . . 5 | . 6 8 |
| 8 4 9 | . . . | . 5 1 |
| . 6 5 | 1 4 8 | 7 . 2 |
|-------+-------+-------|
| . . 6 | . 5 . | . . . |
| . . 7 | 2 8 . | . 1 4 |
| 4 . 2 | . . . | 5 . . |
|-------+-------+-------|
| . . 8 | . . 1 | . . . |
| 7 1 . | . 2 . | . . . |
| 6 2 4 | . 9 . | . . 5 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Code: | after basics
+--------------------------------------------------------------+
| 2 7 1 | 9 3 5 | 4 6 8 |
| 8 4 9 | 67 67 2 | 3 5 1 |
| 3 6 5 | 1 4 8 | 7 9 2 |
|--------------------+--------------------+--------------------|
| 1 389 6 | 347 5 3479 | 289 2378 379 |
| 59 359 7 | 2 8 369 | 69 1 4 |
| 4 389 2 | 367 1 3679 | 5 378 3679 |
|--------------------+--------------------+--------------------|
| 59 59 8 | 3467 67 1 | 26 2347 367 |
| 7 1 3 | 5 2 46 | 689 48 69 |
| 6 2 4 | 8 9 37 | 1 37 5 |
+--------------------------------------------------------------+
# 53 eliminations remain
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Sat Jul 17, 2010 8:01 pm Post subject: |
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Pour commencer.....cinque étapes....toutes différentes
| Quote: | 1. UR[67] r7c4<>67
2.Finned X-Wing on 6s; r7c7<>6
3.XYZ Wing <367> vertex at r7c9; r7c8<>7
4.Colouring on 7s; r6c4<>7
5. XY-Wing <346> r56c6<>6 |
Last edited by Mogulmeister on Sat Jul 17, 2010 9:53 pm; edited 1 time in total |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Jul 17, 2010 9:37 pm Post subject: |
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I thought I had all afternoon, so I just grabbed the first thing that came along. It was 10 steps of assorted stuff which I did not recheck for typos since I was just advised that I did not have all afternoon free.
Type 1 UR (59r57c12; rrc2<>59, which opens us a
6-cell ADP (789)r46c298; outside box implications are r4c7=8, r4c7=9 or r5c7=9
(8)r4c7; r4c8<>8
(9)r4c7-(9=8)r4c2; r4c8<>8
(9)r5c7-(9=6)r5c6-(6=4)r8c6-(4=8)r8c8; r4c8<>8
ANP(89=2)r4c27-(2=6)r7c7-(6=9)r5c7; r4c9<>9
ANP(67=3)r7c59-(3=7)r9c8; r7c8<>7
Type 1 UR (67)r27c45; r7c4<>67
AXY-wing34-7 vertex (34)r7c4, pincers (47)r4c4 & (37)r9c6 with fin (3)r4c4
If xy-wing is true: r4c6<>7
If fin is true: (3)r4c4-(3=7)r4c9; r4c6<>7
xyz-wing (367)r7c9; r7c8<>7
xyz-wing (378)r6c8
(3)r6c8-(3=7)r4c9; r4c8<>7
(7)r6c8; r4c8<>7
(8)r6c8-(8=4)r8c8-(4=6)r8c6-(6=7)r7c5-r9c6=(7)r9c8; r4c8<>7
ANP(67=3)r7c59-(3=7)r9c8-r9c6=(7-6)r7c5=(6)r8c6-r5c6=(6)r5c7; r7c7<>6
Extended potential xy-wing vertex: (8=7)r6c8-(7=3)r4c9-(3=4)r4c6-r8c6=(4-8)r8c8=(8)r8c7; r4c7<>8
Ted |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Sat Jul 17, 2010 9:51 pm Post subject: |
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| Awesome ! I've only got half way through and will continue tomorrow... |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Jul 18, 2010 1:08 am Post subject: |
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Type 1 UR (59)
Finned X-Wing (6)
Type 1 UR (67)
XYZ-Wing (367)
M-Wing (37)
XY-Chain
XY-Wing (467) |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Jul 18, 2010 11:25 am Post subject: |
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First time through my moves were almost identical to mm - I think I did the ER(6) before the UR move. Otherwise the same.
Ted, that's a great a la carte menu of moves...!
In the interests of making Sunday morning more complicated before retiring for a well earned lunch here's a truly ugly 2+ steps solution..
Almost xy-chain with a fin that causes a contradiction...
| Code: | xy-chain fin (7)r6c8
r6c8<>7: (3=7)r9c6 - (7=6)r7c5 - (6=4)r8c6 - (4=8)r8c8 - (8=3)r6c8; r9c8<>3
r6c8=7 : (7)r6c8 - (7=3)r9c8 - (3)r9c6*=(3-4)r7c4=(4-7)r4c4=*(7)r6c4 - (7)r6c8
* r9c6<>3=7 creates (7)r4c4=r6c4 by eliminating (7) in r46c6 |
So that's really two steps. a forcing chain and an xy-chain - though I found it when exploring the xy-chain. (I admit a significant T&E mindset at this point!! Sometimes 'what if' is fun too...)
Still need the type 1 UR(67) r7c4=4 later.... |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Jul 18, 2010 12:04 pm Post subject: |
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Peter: While examining your first step, ...
| Code: | (4)r4c6 - (4=6)r8c6 - (6=7)r7c5
(7)r6c46 = hp(47)r4c46 | | - r9c6 = (7)r9c8; r6c8<>7
(7)r4c6 .......................
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... which exposes your XY-Chain.
(I realllllly need to get to bed and get some sleep!!!) |
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