A Colorful Finish on Classic 144


This post continues the solution of James Forest’s Classical Sudoku 144.

The boomer parade pauses for a pair of AIC  ANL.  This one uses reversed bv to switch from 2-chain to 8-chain and back again.

 

 

 

 

 

 

On the same base, the top is shifted for a second ANL.

 

 

 

 

Sudokuwiki adds one more boomer, a grouped one,  that produces  two naked pairs.

 

 

 

 

 

 

 

 

 

 

 

As the first cluster is added, Sudokuwiki finds a confirming AIC ANL.

The follow up marking

 

 

 

 

 

 

creates an ample field of bv for a second cluster.

The red/orange cluster is no sooner created, than wrapped by a newly created 798-wing. An orange 8r7c2 sees the toxic set, and the red candidates  lead the collapse.

After all those boomerangs, an XYZ-wing?  That’s Sudoku.

 

 

Next up in the review is Classic 168, shown here. The remaining four pre-selected review Lpuzzles are resolved in Basic.  For that reason,  basic traces of remaining Classic  puzzles will be combined with reports on updated posts from Manuel Castillo’s Only Extreme Sudoku.  Next week, the first update report is on Only Extreme 89, originally posted 10/17/2017.

About Sudent

My real name is John Welch. I'm a happily married, retired professor (computer engineering), father of 3 wonderful daughters and granddad to 7 fabulous grandchildren.
This entry was posted in Advanced Solving, Puzzle Reviews and tagged , , , , , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s