Second-Degree Black Belt Sudoku (Martial Arts Sudoku) Review

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These are tough Sudokus. I think these are even tougher than the "Beware! Very Challenging" sudokus from the Will Shortz series. I don't know how they compare to the ones designated "Diabolical," I haven't attempted those yet.
I'm working my way through this book and solving the puzzles successfully about 70% of the time. This seems to be just right to create tension and challenge me without overly discouraging me (again I refer you to Bandura's Self Efficacy theory).
But these are puzzles where you have to plug in numbers at some point and just see what happens. Here's what I do: I start off with a pen, doing all the numbers that can be deduced through logic alone. Then, I switch to a pencil. I find a box with only two options, and guess, write in a small 'A', and then follow it out to see where it goes, labelling the boxes with consecutive letters as I go so I can follow my steps backwards in retreat if necessary. Let me know if you've got a better idea.
The problem with these sudokus is knowing when to abandon logic and start muscling through. It's for this reason that I think I prefer sudokus that can be solved with logic alone (although some make the case that the trial-and-error guessing is just an extension of the logical steps you are taking in your head when solving simpler puzzles). But I got this book as a gift, a little retribution for all my tough Sudoku talk, and I will not back down.
Nice puzzles, well constructed for those of you into symmetry (I'm not sure why you care, but I've seen your critiques of other sudoku books). These books are also a good illustration of the fact that the number of clues filled in to start with is not directly correlated to the difficulty level of the puzzle. These look like easy puzzles at first glance, lots of numbers filled in to start with. But there is very little redundancy in the clues. I always start off hot and then hit a wall.
I like the martial arts metaphor of this series. I'm flattered to be at the second degree black belt level of something I've been at for about eight months. But I saw that he has a book called second degree white belt. What is that? Some kind of veteran neophyte? Or do you have to actively unlearn something to be a second degree white belt?

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With a separate sudoku book for every level, all puzzle lovers can play this wildly popular, incredibly addictive game that's appearing in major newspapers all over! Taking a page from karate - another Japanese art - each title is graded by colour: White Belt for easy, Green Belt for medium level, Brown Belt for hard, and Black Belt for the super-tough solvers. And because each book has an amazing 300 puzzles, the fun can go on for hours.

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