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.