An engrossing primer on sudoku as seen from the creator’s side.
Readers tired of solving sudoku puzzles can try creating them with this fun debut how-to manual.
Zheng’s doctoral research at the University of Nebraska-Lincoln in 2011 involved programming computers to make sudoku puzzles. In this book, she distills the craft into step-by-step procedures that readers can use to make the familiar grids. In a sudoku game, each of the numbers one through nine appears once in each row, column, and three-by-three “box.” The author’s simple process starts with a top row of randomly arranged numbers; readers can then create subsequent rows by “shifting” numbers from the previous row in particular ways. (The procedure also allows readers to build the grid by using columns or boxes instead of rows.) Zheng then provides other rules to help readers make the grid more random. She doesn’t go into the mathematics behind her procedures; she just lays them out as a practical recipe, with lucid, illustrative examples that make the process so easy that complete novices will be able to make sudoku grids in a few minutes. Then comes the hard part—figuring out which squares to erase so that the grid becomes a challenging but still solvable puzzle. Erase too few and the puzzle is too easy; erase too many and it lacks a single, unique solution. To that end, Zheng prescribes methods for deciding which squares to omit, using two elementary tests to determine whether players will be able to deduce the numbers from the remaining squares. The author notes that the procedure amounts to solving the puzzle in reverse. Creating a puzzle is therefore as difficult as solving one, perhaps more so, because there’s no gratifying endpoint—one simply erases squares until the puzzle becomes hard to figure out. Thus, while sudoku-solving climaxes in a triumphant solution, sudoku-making simply grinds to a halt. Still, Zheng’s guide offers readers a vigorous mental workout.
An engrossing primer on sudoku as seen from the creator’s side.Pub Date: June 10, 2015
ISBN: 978-0-9962042-0-0
Page Count: 132
Publisher: CreateSpace
Review Posted Online: Dec. 2, 2015
Kirkus Reviews Issue: Jan. 1, 2016
Review Program: Kirkus Indie
Stricter than, say, Bergen Evans or W3 ("disinterested" means impartial — period), Strunk is in the last analysis...
Privately published by Strunk of Cornell in 1918 and revised by his student E. B. White in 1959, that "little book" is back again with more White updatings.
Stricter than, say, Bergen Evans or W3 ("disinterested" means impartial — period), Strunk is in the last analysis (whoops — "A bankrupt expression") a unique guide (which means "without like or equal").Pub Date: May 15, 1972
ISBN: 0205632645
Page Count: 105
Publisher: Macmillan
Review Posted Online: Oct. 28, 2011
Kirkus Reviews Issue: May 1, 1972
This is not the Nutcracker sweet, as passed on by Tchaikovsky and Marius Petipa. No, this is the original Hoffmann tale of 1816, in which the froth of Christmas revelry occasionally parts to let the dark underside of childhood fantasies and fears peek through. The boundaries between dream and reality fade, just as Godfather Drosselmeier, the Nutcracker's creator, is seen as alternately sinister and jolly. And Italian artist Roberto Innocenti gives an errily realistic air to Marie's dreams, in richly detailed illustrations touched by a mysterious light. A beautiful version of this classic tale, which will captivate adults and children alike. (Nutcracker; $35.00; Oct. 28, 1996; 136 pp.; 0-15-100227-4)
Pub Date: Oct. 28, 1996
ISBN: 0-15-100227-4
Page Count: 136
Publisher: Harcourt
Review Posted Online: May 19, 2010
Kirkus Reviews Issue: Aug. 15, 1996
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