Nakamoto Extreme 123 Is, Briefly

Nakex 123 limps into AIC building briefly,  then succumbs to Sudokuwiki XY chains, simple coloring traps,  a coloring bridge and an outstanding BARN.

Here is the grid at the end of a bypass exceptional among Nakamoto Extreme puzzles.

The slink marking bypass is a human engineering feature that replaces the burdensome candidate identification task most experts cede to the computer, with an enjoyable challenge.



Beyond the naked pairs that claim cells in the bypass, strong link and subset marking are completed in two more systematic stages: box marking and line marking.


Short of AIC building, Sudokuwiki finds only this simple XY ANL, shown here on the line marked grid.






In AIC building, the new c2 7-slink allows an ALS bv boomerang.






That proves enough to get constructive methods going again.

The new r2 7-slink allows another XY.








The new bv prompts a Sudokuwiki simple coloring trap. In the trap, 5r4c8 is removed by green and by blue.  Leave the cluster to possibly expand.

Update the 5-panel, but also look to see what the removal does. Here it creates a grouped slink for a 5-chain ANL.



After W2 and E2,

Sudokuwiki opens a second simple cluster for a trap.







The trap expands red/orange to show:

not                  (blue and range) =>                  green or red

It also enables an XY ANL removing 8 and bringing 7 into red/orange.



a 347-wing and a very striking BARN.


The expansion wraps red in r5c3, and recall that red or green must be true, so orange and green are confirmed.

Next, its Nakamoto Extreme 143.



About Sudent

I'm John Welch, a retired engineering professor, father of 3 wonderful daughters and granddad to 7 fabulous grandchildren. Sudoku analysis and illustration is a great hobby and a healthy mental challenge.
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