Sudokuwiki’s Nakamoto Extreme 103


After Sysudoku Basic, this post describes the Sudokuwiki advanced and AIC solution path on Nakex 103. The next post reports an alternative path shortened significantly by a freeform pattern analysis.

Nakex 103 starts a little differently, with some bypass success:

Also untypical in Nakamoto Extreme is an X-wing in the third stage of basic line marking.

The 5-wing appears when the two 5’s in r6 are seen to match columns with the naked pair of r8. The fish icons are left to affect the line marking of c2, c5, and the closure rows.

 

 

 

The basic trace of Nakex 103:

The first Sudokuwiki move on this grid is an APE in which an 5-value ALS eliminates combination 31 and a bv, the 41.

 

How is such a large APE partner ALS  suggested? Other than the bv, 1r3c9 has only one combination with r3c7, 31 in r3c8. Now from r3c8, you stretch the ALS boundaries along r3 to get one ALS containing 31.

With that, Sudokuwiki now enters AIC building, missing the pink/olive pattern analysis on the 4-panel to be shown in the next post. Will your version of that ready for comparison?

For this  AIC confirming ANL, you might start with the r4 4-slink from 4r4c6, noticing the AIC wink to the W grouped 3-slink. The wink to 3r5c9 and AIC wink gets you to the 4-chain leading around to the C grouped slink closing the ANL. C4=> S4, and the “bunny rabbit” just happened.

The next just happening is an AIC nice loop. 5r5c3 is a good start for a boomer, and Medusa XY  cells carry the ball, but the 4-slink back into the starting cell closes the nice loop.  The same description applies to a boomer start from 4r5c3.

Then an alternate path from 4r5c1 achieves boomerang 1.

 

 

 

 

 

 

 

 

Independently, a second boomer, from 5r6c5, re-traces a section of boomer 1.

 

 

 

 

 

Any emerging slink, however long, is eligible to start a boomerang. Here, the grouping creates the r6 slink necessary to get back to the starting cell of boomer 3.

Sudokuwiki labels boomer 4, in black, as a digit forcing chain, removing 2r9c4 regardless of 4r3c7 being true or false. But arriving at that conclusion by choosing a candidate in the boomer is blind luck. The boomer starts with the 6-slink from r9c4, and the cluster supports the shortcut in red.

The boomer 4 removal enables this confirming AIC ANL, starting from either slink from  9r1c3.  The NW9 placement removes 2r1c3, allowing an extensive cluster to develop. This cluster is an immediate result of the 4-panel pattern analysis to be covered next post.

 

 

 

In fact, the next Sudokuwiki move is an AIC confirming ANL that is also the final move in the shortened solution path next week.

But not here.  After the follow up

 

 

 

 

 

Sudokwiki continues with a hidden unique rectangle, Type 2b. and an XY ANL.

 

 

 

 

 

 

 

 

Next, three moves on a grid. First , the West BARN 3467 removes 6r6c1. This  removes 7r5c1, by the naked triplw 178, or by turning 6r5c1 green for a trap.   The 7 chain stands alone with one elimination 7r9c3, which enables the purple BARN 1238.

 

 

 

Ending this Sudukowiki display in a Sysudoku way, a bv boomer from 6r1c1 wraps green.

 

 

 

 

Even so, it still leaves a 273-wing to put Nakamoto 103 away.

But not until next week, when you compare your shorter version to the one appearing here.

About Sudent

My real name is John Welch. I'm a happily married, retired 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.
This entry was posted in Extreme Solving, Nakamoto, Puzzle Reviews and tagged , , , , , , , , , , . Bookmark the permalink.

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