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Puzzle 11/08/19: ~ XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Fri Aug 19, 2011 9:10 pm    Post subject: Puzzle 11/08/19: ~ XY Reply with quote

Code:
 +-----------------------+
 | . . . | 2 . 4 | . . 3 |
 | . . . | 7 9 . | . . . |
 | . . 1 | 8 . 5 | . 7 . |
 |-------+-------+-------|
 | 1 2 5 | 4 . 8 | . . . |
 | . 8 . | . . 3 | 7 . 2 |
 | 7 . 6 | 9 2 1 | 8 . 4 |
 |-------+-------+-------|
 | . . . | . 5 2 | 3 . . |
 | . . 2 | . . . | . 4 . |
 | 6 . . | . 4 7 | . . 8 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5121
Location: Rochester, NY, USA

PostPosted: Sat Aug 20, 2011 4:41 am    Post subject: Reply with quote

Finned X-Wing, r19; r2c2<>5
DP (15), boxes 39. R1c7=2 or r8c7=6 or r8c9=7. Common outcome; r7c4=6
Type 2 UR (17-5); r8c1<>5
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susume



Joined: 13 May 2011
Posts: 36
Location: Southeastern US

PostPosted: Sun Aug 21, 2011 2:01 am    Post subject: Reply with quote

turbot (5) r9 + c9; r2c2<>5
almost XY wing [(13)r9c4, (39)r9c3, (19)r7c2] =(7)r7c2 -(7=1)r7c9; r7c4<>1

Marty, if I'm not mistaken, your first two steps are enough to solve it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5121
Location: Rochester, NY, USA

PostPosted: Sun Aug 21, 2011 3:50 am    Post subject: Reply with quote

Quote:
Marty, if I'm not mistaken, your first two steps are enough to solve it.

You may very well be right; I've been known to make my share--and then some--of errors. Embarassed
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susume



Joined: 13 May 2011
Posts: 36
Location: Southeastern US

PostPosted: Sun Aug 21, 2011 4:44 am    Post subject: Reply with quote

Think of it not as an error, but as an abundance of solution. I only meant to point out that you had a fine 2-stepper. Smile
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SudoQ



Joined: 02 Aug 2011
Posts: 127

PostPosted: Sun Aug 21, 2011 10:13 am    Post subject: Reply with quote

It can actually be solved in one step:
(9=3)r9c3 - (3)r9c4 = (1)r9c4 - (1=6)r7c4 - (6=9)r7c8 => r7c123<>9, r9c78<>9
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