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May 20 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Wed May 19, 2010 11:30 pm    Post subject: May 20 VH Reply with quote
XY-Wing 46 48 68 eliminating the 6's in r56c7 solves it.
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prakash



Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA
PostPosted: Thu May 20, 2010 1:42 am    Post subject: Reply with quote
Same here. Couldn't find anything else.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri May 21, 2010 1:53 am    Post subject: Reply with quote
Another one step solution is an "almost naked pair"(ANP)
ANP(56=4)r89c9 - r7c8 = r3c8 - (4=6)r2c7; r2c9<>6

In detail, we almost have a naked pair (56) except for the additional (4)in r8c9. Therefore, either the naked pair is true or the (4) is true.
If NP(56)r89c9 is true, then r2c9<>6,
If (4)r8c9 is true, then r7c8<>4, then r3c8=4, then r2c7=6, then r2c9<>6
Thus both conditions result in r2c9<>6 to complete the puzzle.

Ted
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