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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun Apr 04, 2010 4:39 pm Post subject: Puzzle 10/04/04 ___ Chain |
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For those who like a chain after basics ... plus non-chain step(s).
| Code: | +-----------------------+
| 2 . . | . . 6 | . 7 5 |
| . . . | . . 7 | . 9 . |
| . . 4 | . . . | . . 3 |
|-------+-------+-------|
| . . . | . . . | . . . |
| . . . | . 6 9 | . 4 . |
| 4 5 . | . 8 . | 3 6 9 |
|-------+-------+-------|
| . . . | . . 4 | 6 1 . |
| 5 4 . | . 1 2 | 9 3 . |
| 1 . 2 | . . 8 | . . . |
+-----------------------+
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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: Mon Apr 05, 2010 11:49 am Post subject: |
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This took me ages to spot the xy-chain - went through all the bivalues twice before I saw it, even though I guessed what the pincer digit would be!
| Quote: | xy-chain: (8=9)r4c3-(9=6)r4c1-(6=7)r3c1-(7=9)r7c1-(9=3)r7c4-(3=9)r9c5-(9=2)r3c5-(2=4)r2c5-(4=2)r2c7-(2=8)r5c7; r5c123<>8
Then colouring on 3s |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Mon Apr 05, 2010 12:24 pm Post subject: |
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This kind of puzzle needs a name. -- How about the "Texas Two Step"  | Quote: | (2=9)r3c5-(9=3)r9c5-(3=9)r9c2-(9=7)r7c1-(7=6)r3c1-(6=9)r4c1-(9=8)r4c3-(8=2); r3c8<>2
skyscraper 3 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Apr 07, 2010 12:22 am Post subject: |
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| There wasn't one move I could make other than the 38 UR which I didn't play. I tried loads of chains to no avail. Finally one I tried worked, although it didn't create pincers. It was if r5c1=8, then r5c7=8, an invalidity, thus r5c1 must be <>8. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Apr 07, 2010 2:31 am Post subject: |
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Not wildly different from Dan or Peter with a slightly different xy chain, pincers in green eliminate the 8 in blue:
Then colouring (skyscraper) on 3s. |
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