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VH+

 
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ravel



Joined: 21 Apr 2006
Posts: 536
PostPosted: Thu Jan 31, 2008 11:01 am    Post subject: VH+ Reply with quote
Code:
 +-------+-------+-------+
 | . . 8 | . . . | 7 . . |
 | . 1 2 | . . . | 3 4 . |
 | 9 7 . | . . . | . 2 8 |
 +-------+-------+-------+
 | . . . | 3 . 1 | . . . |
 | . . . | 9 4 5 | . . . |
 | . . . | 6 . 8 | . . . |
 +-------+-------+-------+
 | 2 9 . | . . . | . 3 6 |
 | . 4 3 | . . . | 1 5 . |
 | . . 6 | . . . | 2 . . |
 +-------+-------+-------+ m_b_metcalf
>>> play online
If someone is too proud of his sudoku skills, give him this puzzle. It can be solved with xy-wing and basics up to quads, but i would not recommend to solve it on paper. Just to fill in the pencilmarks is hard work.

btw there seems to be a flaw in the online program. There was a situation where an xy-wing leads to a number, but it had no hint available.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Fri Feb 01, 2008 7:10 am    Post subject: Reply with quote
That was a long one.

The hardest part was to find that quad.

Usually, "hard", Times "fiendish" and the like take me 15-20 Minutes to solve on paper (perfect for breakfast Smile ). With this puzzle I was 21 minutes into it, with NO cells solved and just one measly naked pair before I finally spotted the quad! After that and with the first solved cell r1c9=1, the xy wing jumped right into my eye (69-59-56) and while I was at it, another one 78-79-89), but still another 10-15 minutes until the finish.

For you P&P guys out there - don't let yourself be discouraged. Just write real small Wink As Calvin's dad used to say "builds character".

click here to see a hint if you have trouble finding the quad
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sat Feb 02, 2008 2:05 am    Post subject: Reply with quote
ok, i am writing small, so a little hint please.

is the quad in box 6??
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