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UR+SL: Introduction

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon Oct 31, 2011 8:32 pm    Post subject: UR+SL: Introduction Reply with quote

I'm posting here first to get feedback before building a summary thread in the Solving Technique forum. Also, it'll be easier to trash everything if the whole project falls flat on its face.

Upon reflection, I realize that all of the UR+SL patterns are already cataloged by Mike Barker. So, I wouldn't need to verify that a pattern is unique. All I'd need to do is present them in (hopefully) a more user-friendly context. Since Mike Barker also posted a collection of UR puzzles for his patterns, I can "borrow" one of his puzzles as an example for each pattern that I'd present.

I will deviate slightly from Mike Barker's notation. Instead of using "a" and "b", I'll use <1> and <2> for the UR candidates in the patterns. However, I'll continue his use of lowercase letters, e.g. "x", for a single candidate other than the UR candidates. Likewise, I'll continue his use of uppercase letters, e.g. "X", for the possibility of multiple candidates other than the UR candidates. Also, I'll drop his use of a context-free pattern, and present each pattern as if it is in [b1] and [b4] with bivalue cells in [c1] whenever possible.

Of course, the example puzzles will be presented using their original UR candidates and boxes containing the pattern.
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keith



Joined: 19 Sep 2005
Posts: 3182
Location: near Detroit, Michigan, USA

PostPosted: Mon Oct 31, 2011 11:28 pm    Post subject: Reply with quote

Danny,

I'd like to encourage you to do this! I think we will all gain new insights.

Even if Mike Barker's catalog is complete, I think a new catalog may help our understanding.

I suggest you start the thread with one message stub explaining the goal, and perhaps the history, and a second message stub providing a glossary of terms and notation. No doubt, these may be edited many times.

And, of course, I look forward to ronk the terrier, nipping at your heels! Keeping you on the straight and narrow.

Best wishes,

Keith
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