Nakamoto 143 Avoids Extremes

Nakex 143, the eighth puzzle in the review, avoids AIC building with an outstanding exhibition of advanced techniques, and

three subsets in basic line marking, including this naked triple.

Two more show up in LM closing, the stage that examines unmarked lines after all of those in the opposite direction are marked.


The second subset is this hidden pair as the last line, r6, is closed. Do you see anything else in r6?

There’s two ways to describe it in the basic trace.

Nakamoto Extreme 143 is a show off on advanced moves as well. It couldn’t be just an XY ANL. No, it had to be five ANL with three terminals. We count the almost nice loop for every victim, because each is the meeting of a different pair of winks.



The swordfish shows up on the 7-panel, after the 3-chain and its SWc2 boxline 3r4c2 removal. The Sudokuwiki gets the same results from a simple blue/green cluster, and a Wc3 boxline.





A  rare classic WXYZ and an XY ANL are enabled by the 3r7c3 removal.  Also the swordfish breaks the 7-panel into two complementary dead swordfish in a complete color linked field that becomes the backbone of a new  red/orange cluster.


Cells r4c7 and r9c8 demonstrate

not (green and orange) => blue or red,

springing the r9c2 traps that imply green or orange,  trapping  r4c7 and r9c8.

Now SE4 => NE6, and a 6–ANL wraps orange in c7, confirming green in r9c8. It’s a red sunset with a green flash for Nakamoto Extreme 143.


Next up is Nakex 163.





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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