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Janric Classic 5/14/06

 
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PostPosted: Sat May 20, 2006 7:50 am    Post subject: Janric Classic 5/14/06 Reply with quote

Code:

Original                 Before chains
927 060 300              927 068 340
000 903 000              000 903 078
080 070 009              080 470 009

730 000 800              730 000 800
002 604 700              002 684 700
008 000 012              008 000 012

800 090 050              800 096 050
000 805 000              000 805 000
005 040 986              005 040 986


By far the toughest puzzle to appear in our local paper. I often solve them without any pencil marks. But not this one!

I eventually got there with forcing chains. The first two chains I found- not "5" in r1c9 and not "2" in r4c5- each added two solved cells but no other deductions (that I could find!) simpler than a single "turbot fish" elimination. The third chain- not "3" in r8c8- broke it open.

Is there anything less cumbersome/more elegant than the chains?

Thanks in advance,

Dale
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Sat May 20, 2006 12:06 pm    Post subject: Re: Janric Classic 5/14/06 Reply with quote

Anonymous wrote:

Is there anything less cumbersome/more elegant than the chains?

Nothing i could see. This is a rather hard puzzle, that i certainly could not solve without pm's (but the expert for this is RW on another forum).
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Marty R.



Joined: 12 Feb 2006
Posts: 5176
Location: Rochester, NY, USA

PostPosted: Sat May 20, 2006 6:30 pm    Post subject: Reply with quote

If pencil marks means filling in cells with their candidates, then I couldn't conceive of doing a puzzle without them.

After writing in the candidates and doing the basic stuff, there was a Finned X-Wing on "5" which eliminated one candidate, but I don't recall if that contributed to the solution.

Then, I guess I stumbled onto the right chain. Of the two possibilities for "6" in box 6, r4c8 led to a contradiction, and entering the "6" in r6c7 broke it wide open.
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PostPosted: Mon May 22, 2006 2:03 am    Post subject: Reply with quote

Marty R. wrote:
If pencil marks means filling in cells with their candidates, then I couldn't conceive of doing a puzzle without them.



Ah, you haven't seen these puzzles. This one also received the toughest rating from "Janric Classic Sudoku".
Code:

003 602 700
050 803 000
010 000 008

164 000 309
000 070 000
207 000 586

400 000 010
000 509 040
008 701 900


This is far more representative of what get's their "Gold" rating. Only after I looked on-line did I realize that there WAS something to this Sudoku stuff. I'll have to look at Finned X-Wings next.

Thanks for your reply,

Dale
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