description Dominosa Overview
Dominosa is a combinatorial deduction puzzle where solvers must reconstruct a complete set of dominoes (typically double-six) by drawing boundaries around pairs of adjacent numbers in a rectangular grid. The challenge lies in determining which adjacent numbers form domino pairs and which do not, with the constraint that each domino in the set appears exactly once. Created by Leopold Levi, the puzzle was later popularized by mathematical puzzle author Martin Gardner. Dominosa tests deductive reasoning and is suitable for puzzle enthusiasts who enjoy logical challenges with a mathematical underpinning.
help Dominosa FAQ
What are the rules of a standard double-six Dominosa puzzle?
The grid contains 28 dominoes, one each of the combinations from 0-0 through 6-6, so a common 8x7 board has 56 cells. You draw boundaries between adjacent numbered cells to recover every pair exactly once.
Can Dominosa dominoes touch diagonally?
No. A legal pair must share an edge, not just a corner, and every cell must belong to one domino exactly once.
How do you start solving Dominosa without guessing?
Look for forced pairs, such as an isolated matching pair or the only remaining location for a combination such as 3-5. After marking it, remove those cells and update the remaining count among the 28 dominoes.
What makes a Dominosa solution complete?
Every cell must be covered exactly once and all 28 double-six combinations must appear exactly once. If a pair appears twice or one combination is missing, the reconstruction is invalid even if no cells overlap.
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