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Nov 15 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden

PostPosted: Sun Nov 15, 2015 7:59 am    Post subject: Nov 15 VH Reply with quote

One stepper: XY-wing 459, pivot r9c2, gives r2c2 = 4.
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sun Nov 15, 2015 2:11 pm    Post subject: Reply with quote

Code:

 +-------------+-----------+------------+
 | 8 3    45   | 2 6   7   | 9   1   45 |
 | 2 45   7    | 9 18  18  | 45  6   3  |
 | 9 6    1    | 3 4   5   | 2   8   7  |
 +-------------+-----------+------------+
 | 4 2    6    | 5 789 89  | 78  3   1  |
 | 5 78   3    | 1 278 4   | 6   27  9  |
 | 1 789  89   | 6 278 3   | 578 4   25 |
 +-------------+-----------+------------+
 | 7 59   2    | 4 3   6   | 1   59  8  |
 | 6 4589 4589 | 7 19  129 | 3   259 24 |
 | 3 1    49   | 8 5   29  | 47  279 6  |
 +-------------+-----------+------------+

Of course the pivot of roaa's 49-5 XY-Wing is actually in r9c3. There's also the 59-4 XY-Wing with pivot at r7c2 so r1c3<>4 which solves it.
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