Monthly Archives: December 2011

Sysudoku Sue de Coq


This post details forms of Sue de Coq  not revealed  in the founding post of October 24, 2005, widening the definition of classic Sue de Coq to all ALS and including a single alternate version. It introduces another form of … Continue reading

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De Coq on Sue de Coq


This post explains Sue de Coq and invites readers to enumerate all instances of it in the originating post’s puzzle. I may be entirely alone in suggesting Sue de Coq as one of the first advanced methods to use after … Continue reading

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Beginner’s Page


I’ve added a page demonstrating dublexes and cross hatching, for begineers. There was a little hitch getting images and text to display, but I think its cured now.  If you know anyone who couldn’t get started on the blog, please … Continue reading

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The Remote Pair – A Special XY-Chain


The remote pair comes your way with a blinking road sign. It is an XY-chain in which every bv along the chain contains the same two candidates, X and Y. The X and Y in the end cells are toxic. … Continue reading

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Riding the XY Rails


This post illustrates the complete enumeration of all XY-chains and toxic end pairs by drawing curves through the bv along XY-chain routes. XY-chains are then systematically divided into sub-chains with toxic ends. It’s a Sysudoku innovation. The puzzle is from … Continue reading

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