No part of this book may be used or reproduced by any means, graphic, electronic, or mechanical, including photocopying, recording, taping or by any information storage retrieval system without the written permission of the author except in the case of brief quotations embodied in critical articles and reviews. SOLVE EXTREME SUDOKU STRATEGIES FOR EASY TO HARD PUZZLESĬopyright © 2015 Scott Gandert & Robert Emmert.Īll rights reserved. He is a Sudoku enthusiast and enjoys working the most difficult puzzles he can find, typically puzzles from Read more He is a former teacher, former waiter, former landscaper, former counselor, former CB radio salesman, former small business owner, former private investigator, and full-time husband and father to 4 indoor cats. He holds an MBA with an emphasis in International Healthcare, an MA in Counseling Psychology, and a BA in English. Scott Gandert is the author of several books, most recently, “Searching for Brakemen” (Indiana: IUniverse, 2015). Bob (with another engineer) holds a patent on a strap down, guidance system for a tactical missile. He was the manager of Advanced Development Engineering for the Missile Division of Rockwell International and his technical expertise was “Tactical Missile Guidance and Control”. He attended Ohio State University and received a MS in Electrical Engineering in 1964. Bob began his aerospace career with North American Aviation in 1961. on the Aircraft Nuclear Propulsion project and developed the reactor control systems for experimental reactors. He was then employed by the General Electric Co. After graduation Bob attended The Oak Ridge School of Reactor Technology (ORSORT) for one year to study Nuclear Engineering. Bob has been working Sudoku puzzles for five years, and has developed some solution techniques, given in this book, that should be helpful to “Sudoku Warriors”.īob graduated from the University of Arkansas in 1953 with a BS in Electrical Engineering. To print multiple puzzles, there are special pages to print two, four, or six puzzles per page.Robert (Bob) Emmert is a retired aerospace engineer. Guessing is never required - but it may help! Each puzzle has a unique solution and can be solved with pure logic.
The position is saved as 81 digits at the end of the URL string, with hyphens used for empty cells.Įxtreme Sudoku posts five new puzzles every day. To save any position, right-click on under the grid, and click Add To Favorites or Bookmark This Link. You can add symbols too, such as question marks. If you prefer to enter your own pencilmarks, up to six digits can be entered in each cell.
#EXTREME SUDOKU BOOK UPDATE#
These update by themselves as you solve particular cells and cannot be edited manually. There are automatic pencilmarks that appear if you check the Pencilmarks box.
So it's possible to have incorrect digits that don't conflict, but eventually you will get stuck. The Show Conflicts button does not apply the solving logic - just checks whether there are any conflicting digits already in the grid. To print the puzzles use either the Print button below the grid, or if you want to print the pencilmarks as well, use the browser Print option under the File menu. See our guide to solution rules for hard sudoku puzzles.Īll the puzzles on this site rate a "fiendish" category, but then we picked the hardest, and graded them in five progressively more difficult categories: Evil, Excessive, Egregious, Excruciating, and Extreme, in order from least difficult to most difficult. Difficulty depends on the type of steps required to solve them, and also on the number of each type of step.
Solving these puzzles is a different matter entirely, since these are the most difficult puzzles we create. Each row, column, and 3 x 3 box must contain only one of each of the 9 digits. Just place the digits from 1 to 9 in each empty cell. Then try some of our very hard sudoku puzzles.
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