![]() Shipping may be from multiple locations in the US or from the UK, depending on stock availability. This title includes tricks such as hidden pairs, naked pairs, X-wings, jellyfish, squirmbag, bivalue and bilocation graphs and chains, as well as the exclusive Gordonian logic methods that turn the toughest puzzles into a breeze. A special addition is a reprint of the very first sudoku ever published! Offers Sudoku designers a guide to cracking addictive puzzles, and Sudoku solvers a way to improve their skills. There are hundreds of sudoku to practice on. Even experts don't know all these tricks: hidden pairs, naked pairs, X-wings, jellyfish, squirmbag, bivalue and bilocation graphs, and chains, plus the exclusive Gordonian logic methods that turn the toughest puzzles into a breeze. Sudoku designers the world over will weep and gnash their teeth at the revelations in this comprehensive guide to cracking the addictive puzzles-but solvers will find it absolutely invaluable as they seek to improve their skills. Who is to say there is not some deeper logical deduction that would solve these Sudokus, which remains undiscovered? Meanwhile, using bifurcation, I can continue to complete my daily diabolical and then get on with more important things.Book Description Paperback. This, frankly, is not so different from "forcing chains", yet the author dismisses bifurcation as "guessing" and arrogantly claims Sudokus that will not submit to his collection of logic techniques should not be allowed. This is not a process of pure guesswork, it is informed trial-and-error - "easy" logic reduces the puzzle to a few possibilities, and then we test one of those possibilities until it either leads to a solution or a contradiction. Without that ability, how does the merely-human complete a puzzle? Bifurcation will find a solution in deterministic time rather than spending an unknown amount of time staring at a grid for the trick that will solve it. Perhaps nobody has come up with one and the ability to find them is what separates the highly intelligent from the super-intelligent. There remains a gap in the market for developing a method to aid a NI (natural intelligence, as opposed to a computer) in spotting the more esoteric patterns necessary for cracking the harder puzzles. That said, it is as good as any other Sudoku guide I have come across. There are many pages devoted to providing a supply of puzzles (which can easily be had from any daily newspaper) but some of those pages could have been better used for diagrams to illustrate the logic of solving. Frank Longo has written over 90 sudoku books, including Oy Vey Sudoku 10x10 Sudoku Mensa® Absolutely Nasty Sudoku Level 1, 2, 3, and 4 The Worlds Longest Sudoku Puzzle and The Sudoku Code (co-authored with Francis Heaney). In my opinion this book misses a trick: mostly, the diagrams do not highlight cells of interest in the discussion so leave the reader to search for them at the same time as following the discussion - perhaps the author can do that with ease, but I can't and it makes for a hard study. I was looking forward to some tips about the practicalities of solving tougher Sudokus - my own logic techniques are very similar to those explained in this (and other) books, but I fall down on being able to spot the patterns amongst the clutter. I am already adept at Sudoku solving, and a Mensa member. To learn more about how and for what purposes Amazon uses personal information (such as Amazon Store order history), please visit our Privacy Notice. You can change your choices at any time by visiting Cookie Preferences, as described in the Cookie Notice. Click ‘Customise Cookies’ to decline these cookies, make more detailed choices, or learn more. Third parties use cookies for their purposes of displaying and measuring personalised ads, generating audience insights, and developing and improving products. This includes using first- and third-party cookies, which store or access standard device information such as a unique identifier. If you agree, we’ll also use cookies to complement your shopping experience across the Amazon stores as described in our Cookie Notice. We also use these cookies to understand how customers use our services (for example, by measuring site visits) so we can make improvements. We use cookies and similar tools that are necessary to enable you to make purchases, to enhance your shopping experiences and to provide our services, as detailed in our Cookie Notice.
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