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A domino puzzle (Posted on 2008-08-15) Difficulty: 2 of 5
Arrange the 28 pieces of a standard domino (0-0 to 6-6) in the board shown, so that equal spot numbers occur in groups of four, forming squares. Fourteen squares should result, each containing four equal spot numbers.
            +---+---+       +---+---+
            |   |   |       |   |   |
            +---+---+---+---+---+---+---+---+
            |   |   |   |   |   |   |   |   |
            +---+---+---+---+---+---+---+---+
            |   |   |   |   |   |   |   |   |
            +---+---+---+---+---+---+---+---+
            |   |   |   |   |   |   |   |   |
            +---+---+---+---+---+---+---+---+
            |   |   |   |   |   |   |   |   |
            +---+---+---+---+---+---+---+---+
            |   |   |   |   |   |   |   |   |
            +---+---+---+---+---+---+---+---+
            |   |   |   |   |   |   |   |   |
            +---+---+---+---+---+---+---+---+
            |   |   |       |   |   |
            +---+---+       +---+---+

See The Solution Submitted by pcbouhid    
Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution re: Pencil and paper solution. | Comment 2 of 3 |
(In reply to Pencil and paper solution. by Charlie)

There are bold horizontal lines in the diagram to delineate the dominoes in the previous post, but they don't look bold.

So:

            +---+---+       +---+---+
            | 0  0 |       | 2  2 |
            +---+---+---+---+---+---+---+---+
            | 0 | 0  4 | 4  2 | 2  6 | 6 |
            + +---+---+---+---+---+---+ +
            | 5 | 5  4 | 4  1 | 1  6 | 6 |
            +---+---+---+---+---+---+---+---+
            | 5 | 5  3 | 3  1 | 1  5 | 5 |
            + +---+---+---+---+---+---+ +
            | 2 | 2  3 | 3  6 | 6  5 | 5 |
            +---+---+---+---+---+---+---+---+
            | 2 | 2  0 | 0  6 | 6  4 | 4 |
            + +---+---+---+---+---+---+ +
            | 1 | 1  0 | 0  3 | 3  4 | 4 |
            +---+---+---+---+---+---+---+---+
            | 1  1       | 3  3 |
            +---+---+       +---+---+

  Posted by Charlie on 2008-08-15 12:22:27
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