Su Doku Demystified: The “How to” Book to Understand and Solve Su Doku puzzles
This book is unique amongst the many books on SuDoku. Dr. Dresnick has developed techniques to solve puzzles at all levels of complexity using deductive reasoning. Unlike many books which use look at all of the possibile locations where numbers CAN go, Dr. Dresnick's techniques are based on determining where numbers can NOT go, thus arriving at the correct number without guessing!
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1’s already 9 in column 9 is missing 9 Let’s shade 9 MUST go already in column already in h6 BOX because ofthe BOX is missing c d e f g h cells in column cells where 9 Column 7 already column 9 ﬁll finish column finish row finish the LEFT g h 9 go in a1 go in b9 go in c7 go in d2 go in e1 go in f8 go in g6 Grid Line Exclusion Grid Line Placement Leap of Faith LEFT LOWER BOX LEFT MIDDLE BOX LEFT UPPER BOX Let’s shade look at row Looking at column LOWER MIDDLE BOX missing 9 missing numbers ofthe 8’s Perpendicular Grid Line putting the missing remaining cell remaining open cell RIGHT LOWER BOX RIGHT MIDDLE BOX RIGHT UPPER BOX row f row g row h Row i already Rule of Threes shade the cells Single Grid Line UPPER MIDDLE BOX