Sudoku Truck… I mean Trick

Check out this example row:

1 2 3 4 5 6 7 8 9
4/5 2 8 6/9 6/9 7 3 4/5/9 1

Look at cells 1 and 8. Both of those have 4 and 5 as possibilities but cell 8 also has 9. We know a row has to have both a 4 and a 5, and since those cells are the only two places 4 and 5 can go then that eliminates 9 as a possibility in cell 8.

This trick can also be used for a column or square.

Join the Conversation


  1. But… Doesn’t the presence of 5/9 in both columns 4 and 5 ensure that one must be 5 and the other must be 9 thus removing both from consideration in columns 1 and 8? Or did you mean for a 6 to be somewhere in there?

    (I like that google has recognized my interest in trucks and provided me with helpful links to truck parts. Would those be Sudoku truck parts?)

    apologies… bored geek.

  2. You’re right, Avenger, the 5/9 should be 6/9. You get where I’m going with that… Shouldn’t you be getting back to work? You are breaking my 100% concentration.

  3. Challenging though it is, what I do isn’t called work. It’s something else, like… purgatory.

    Sorry about the concentration. Oops, I did it again.

  4. Mr. Miyagi say, is important to keep balance between avenging and sodoku playing

  5. If you want to try out something new in sudoku, try shendoku, using the sudoku rules but playing two people, one against the other, like battleshipps. They have a free version to download at . Anything else they are bringing out or they are working on you can find at or at they´r blog . Have fun, I am. I specially like one slogan I heard about Shendoku: SUDOKU is like masturbation (on your own)…. SHENDOKU is like sex (it takes two).

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