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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Oct 30, 2010 5:32 pm Post subject: Puzzle 10/10/31: A15 Advanced |
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I'm hanging up my hat on posting puzzles. Today's puzzles are the last.
| Code: | +-----------------------+
| . 7 9 | 1 . 3 | . 5 . |
| 1 . . | . . . | 3 . . |
| 3 . . | . 5 . | . 8 1 |
|-------+-------+-------|
| 7 . . | 8 . 2 | . . 3 |
| . . 2 | . . . | . 6 . |
| 9 . . | 5 . . | . . . |
|-------+-------+-------|
| . 9 . | . . . | . 3 . |
| 8 . 5 | . 2 . | 9 4 6 |
| . . 7 | 9 . . | . 2 . |
+-----------------------+
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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: Tue Nov 02, 2010 5:57 pm Post subject: |
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Three advanced steps...
| Quote: | type 1 UR(58) ; r7c9<>58=7
kite(4) r2, c4 ; r5c9<>4
xy-wing(89-1) r5c9 ; r4c23<>1 |
The same final eliminations can be made after basics with a simple ANP move
| Code: | | ANP(19=6)r4c58 - (6=7)r2c5 - (7=9)r2c8 - (9=1)r4c8 ; r4c23<>1 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Nov 03, 2010 3:56 pm Post subject: |
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| I've done this a number of times, some due to errors and some due to curiosity. The one constant has been an XY-Wing (374), flightless with transport; r3c3<>4. That was a one-stepper on one of my tries. On other tries I used the Type 1 UR (58) and an X-Wing (4) plus XY-Chain. I think I'll quit without knowing my actual solution. |
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