An Easter Monster Alibi Holds Up


This post carries out the blue/green color trials to confirm or deny the blue-to-yellow cluster merge in the Easter Monster.

EM blueyell raidThe blue-to-yellow trial has reached a point where the shell testimony of 1, 2, 6 and 7 is pinned down. The inner core attack begins with the blue trial, featuring this almost nice loop.

The trace:

35393-ANL =>

(S3m, SE3m, r7np48).

 

 

EM blueyell 2nd ANLThis enables another one: S3m=>48584-ANL=>SW8 .

The removal leads to a contradiction that dooms blue candidates of a possible yellow to blue merge.

Both the entire trial trace and a diagram of the inference path from removal to contradiction is below. It takes a lot of patience to follow it in either form, but it took no special insight to generate the trial trace, and then the diagram from the trace.

EM blueyell blue traceEM blueyell blue grid

EM blueyell green gridThe blue-to-yellow green color trial is very similar, more evidence of the shell/core isolation of EM. You just have to do everything twice.

This time, the red ANL forces NW8, and the green ANL forces both SW4 and SE4 in r7.

The trials end with blue-to-yellow implying not blue and not green. A hung jury and the Easter Monster walks. But not far.

EM bluepurple trapsFinally, we have the goods to confront the EM, Perry Mason style. It’s down to blue-to-purple and green to yellow, red-to-maroon and orange-to-grey.

Already 7-patterns are trapped down to two, one blue and one green. The solution takes no more than what we have already done with EM, so go for it. And be sure to tune in next week for the final court room scene.

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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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