Sudokuwiki Gets a Second Chance

In a second updated review post on KrazyDad v.4, b.8, n.5 , Andrew Stuart’s Sudokuwiki solver gets the clue that the ALS boomerang left unresolved, and finishes the solution, with more instructive moves. You get a shot at that unusual clue.

Here is the 9-panel when KD 485’s ALS boomer discovers that 9r2c2 and 9r2c9 are a toxic set. It looks unpromising, until you take the toxic set into account.  Do that for yourself, then enjoy  the parade of Sudokuwiki moves in the updated post. There’s a BARN, an unaligned APE, and classic 263-wing.




A particularly impressive move is this ALS aided confirming ANL promoting  9r5c4. For you or me, it could have started as a possible boomerang, leaving 9r5c4 in search of a wink back into 1 to eliminate that 1. But since the cell is a bv, it also puts two slinks around 9. Actually it’s the same result, whether you list it as a confirming or eliminating ANL. With another candidate in the starting cell, it would be only eliminating.

When the solver invokes coloring for a single trap on 3r4c3, we expand the cluster as far as it will go, in pursuit of a possible wrap.  The 363-wing and Wr6 boxline elimination are reported on the same grid.  The wrap is not long in coming.

The next update report is on KD Insane 495, already up.

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.
This entry was posted in Advanced Solving, KrazyDad, Puzzle Reviews and tagged , , , , . Bookmark the permalink.

Leave a Reply

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

You are commenting using your 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