Books 3 and 4 In the KD Insane Review

Welcome to 2019 Systematic Sudoku. This post continues on the updated KrazyDad v4 review, with KD Insane 435 and 445. This is a brief report on what you’ll find in the updated posts of August 2013. The review update begins a general one over the most difficult, and therefore most significant, reviews, in over seven years of weekly blogging.

Insane 435 starts advanced with a hidden unique rectangle, and then becomes a stage show of ordinary XYZ’s with victims determined to “see” themselves to death. Here’s an example of how weird it got. An ordinary rectangular 136-wing inspires 6r5c1 seeing two toxic set members to find a way to look upon a third. A good example of filtering your looks.


Then 445 presents you with multiple exotic ways to get the same result, such as this gem, an XY wing, unless you want to claim a 3-set BARN. Or hidden UR, anyone? Can you make an APE out of it?

The show is over when this double ANL triggers a collapse, but KD 445 doesn’t let you leave without taking along a pink olive finish as well.




On the 6-panel, in the freeforms going  North from r7, olive must go to r6c1, making it, and r5c3, collectors. It’s the last chance for a 6 in c1

Now on r5, the alternatives to c7 must cross r3 at c8, a column already taken. Another collector.

Since r5c3 is a pink collector, the alternatives become orphans, confirming 6r4c4 as C6, which is enough for the collapse. However, you should be aware that you have just attended a trial. Pink has not weighed in, and if given a chance, comes up with two candidate patterns.

Interesting? Use the monthly roll on the right to dig back into 2013.

The number 5 in books 3 and 4 don’t prepare you for the one in book 5. Look it up on and try it, then check out Insane 455 in the updated post of 8/20/13 and tune in next week for my ideas of its value in Sysudoku.

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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