KrazyDad Insane 425 Introduces Pattern Slicing


This post reports on the introduction of pattern slicing, a.k.a. the pink olive, in KD Insane v4, b2, n5 of 7/30/13. The method is defined, and demonstrated on the 3-panel of Insane 425. This review is being updated first, as one of the most instructive.

After a terrific ANL boomerang series, the previous post leaves a challenge for pattern analysis to merge two limited coloring clusters with a common value 3.

To see if a merger is implied by pattern restrictions, the coloring is transferred to the 3’s freeform panel. Each of the three 3-patterns depends on a pair of colors, but all pairs are consistent with blue and/or orange as true colors, and no freeforms are rejected.

 

 

 

This simple case and successful application affords an opportunity to explain the pink/olive mapping process of two stages.  Here is the first stage, the coloring of columns and boxes as derived from the two starting rows r6 and r4.  Deriving the row coloring allows no alternate mappings.

The complete mapping rejects the two pink freeforms and allows the single olive one.

The combination of pink/olive coloring and posting the freeforms on separate panels clearly makes the case for pattern slicing.

Next post updates KrazyDad Insane review puzzles 435 and 445.

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About Sudent

My real name is John Welch. I'm a happily married, retired professor (computer engineering), timeshare traveling, marathon running father of 3 wonderful daughters and granddad to 7 fabulous grandchildren. The blog is about Sudoku solving. It covers how to start, basic solving to find candidates efficiently, and advanced solving methods in an efficient order of battle. It is about human solving methods, not computer solving.
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