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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Oct 16, 2010 5:21 am Post subject: Puzzle 10/10/16: A Advanced |
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| Code: | +-----------------------+
| . 2 7 | . . . | . 3 9 |
| 3 8 . | 7 . 9 | . 4 . |
| 9 . 6 | . . . | . 1 7 |
|-------+-------+-------|
| . 6 . | 9 . . | . . 4 |
| . . . | . 6 . | . 5 3 |
| . 9 . | . . 7 | 6 . . |
|-------+-------+-------|
| . . . | . . 3 | 7 6 2 |
| 6 7 4 | . 2 . | 3 9 . |
| 2 . 9 | 6 7 . | 4 . 5 |
+-----------------------+
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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: Sat Oct 16, 2010 4:00 pm Post subject: |
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I played/tried a lot more steps than these - but this was my best path through what I found a tough puzzle..
| Quote: | xy-wing(45-1) r3c2 ; r56c3<>1
finned x-wng(5) r26c35 ; r4c5<>5
xy-wing(58-3) r4c1 ; r4c3<>3, r6c45<>3 |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Oct 16, 2010 9:14 pm Post subject: |
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agreed, tough puzzle.
very nice path. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Oct 16, 2010 10:28 pm Post subject: |
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| I played the XY-Wing on 451 followed by an X-Wing on 4, which made no difference. Looking at the implications of the potential DP on 58 in boxes 47, r4c3<>3 due to invalidity. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Oct 16, 2010 11:45 pm Post subject: |
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Since I don't solve puzzles, other than tackling the occassional grid, my solver's solution to a difficult puzzle often looks reasonable to me. However, after reading the comments, I decided to take a closer look at its solution.
| Code: | c26 X-Wing <> 4 r3c5 extraneous
r16 X-Wing <> 4 r3c5 "
<45+1> XY-Wing r3c2/r2c3+r5c2 <> 1 r56c3
b4 Naked Quad <> 2358 r6c1
r26\c35 finned X-Wing <> 5 r4c5 -or-
r2 b4 Empty Rectangle <> 5 r4c5
<58+3> XY-Wing r4c1/r4c5+r6c3 <> 3 r4c3,r6c45
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Yes, all four steps (including the Naked Quad) are tight -- one playing immediately into the next. |
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