• 500 Natural Sudoku Puzzles

    Hung-ping Tsao
    Lawrence K Wang (see profile)
    Science, Technology, Engineering, Arts and Mathematics (STEAM)
    Mathematics, Sudoku puzzles, Autobiographies
    Item Type:
    Rule of unique solution, Candidate, Principle of the Least Choice, Residue, Flipflops chain, Stratigic flipflops. Row move, Column move, Block move, Box move, Grid move
    Permanent URL:
    Tsao, Hung-ping (2023). 500 Natural Sudoku Puzzles. In: "Evolutionary Progress in Science, Technology, Engineering, Arts, and Mathematics (STEAM)", Wang, Lawrence K. and Tsao, Hung-ping (editors). Volume 5, NUMBER 9B, September 2023; 477 pages. Lenox Institute Press, Auburndale, MA, 02466, USA. No. STEAM-VOL5-NUM9B-SEP2023; ........ ABSTRACT: (a) Hard sudoku puzzles are usually designed for defying our logical reasonings, so we can counter with the Principle of Least Choice (PLC) by selecting the least likely one when facing the multiple choices of our next move. The harder the puzzle, the more often PLC is recommended to be used.(b) This lecture serves as the preface for promoting the natural Sudoku (Sudoku with 17 givens). Accordingly, I plan to give a series of lectures, each containing two puzzles with illustrative solutions, the second one of which is the demonstration of the first of the 49 practice puzzles with annotated solutions. All natural Sudoku puzzles are downloaded from Gordon Royle list.(c) The minimum of 17 givens is required for a Sudoku puzzle to not having multiple solutions. There are no extra givens that puzzle makers can maneuver to design extremely hard Sudoku. Therefore, we shall not use PLC at all for any of our lectures. Hard puzzles can sometimes be solved by the construction of strategic flipflops.(d) The purpose of my lectures is for you not to waste time in playing Sudoku.In addition to the introduction of efficient methods, we most importantly screen out those puzzles with multiple or no solutions in the collection of practice sets for you.(e) The lectures are presented in the power point format, convenient for any interested instructors to use.(f) 迷宮巧門四處築,Maze with clues has been built in every foreseeable place, 一切設障不難除;All barriers could be removed without any frustrating face; 無事且登三寶殿,In idle time please come to visit the three treasures palace, 閒情逸致玩數獨。Relax your mood and nerves and indulge in Sudoku space.
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    7 months ago
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