Lots of tips from our readers on solving sudoku...

Math

by Rick Yakubisin(Greensburg, PA) Any row, column or grid. Pick a candidate and count how many the chosen candidate is in the row, column or grid. Count the cells that

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Related Values Chaining

by Cliff McQuesten(Florida panhandle) Related Values Chaining extends xy-chaining to analyze row-, column- and box- interactions between chain links and cells that are not part of the chain. A group

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Chain

To use the chain strategy, pick a box with only 2 candidates that you would like to solve. Now imagine that the answer to that box is the first candidate.

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Row of 3

by RFTredwell(Orono, Maine, USA) Suppose you have solved three cells in a row (or column) within a region. (Rows with letters, from top; columns with numbers from left.) For instance,

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Using Colors

by Mohammed Hajooze(Aleppo Syria) First I use Orange to mark the start of color mapping, in this example the candidate is (1). Find a column or row where the candidate

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Rule of Two

by Cynthia Wilson(White Sulphur Springs MT USA) For difficult puzzles, I’ve adopted what I call the Rule of Two. Simply put: no cell should ever have more than two numbers

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Dots

by Colleen Atradley(lkwd, co usa) In the cell I put a dot for 1 2 3 4 5 6 7 8 9 When I look at a cell a know

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Coupled Pairs

by Robert Benson(San Diego, CA, USA) While I use all the methods you give, one of my favorites (which I have not seen in print yet) is to use “coupled

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