Dominosa

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Dominosa puzzle

Dominosa puzzle

Not all logic puzzles were invented in Japan. One of the striking examples of European games of this type is Dominosa. Created in the 19th century based on the famous game of dominoes, it quickly gained popularity in Germany, Poland, Great Britain, and many other countries.

Simple and understandable rules, and at the same time the logical orientation and complexity of the solution, made this game famous among different castes and classes.

Game history

The authorship of most logic games that have survived to this day from past centuries is unknown. Dominosa is no exception in this regard. Although it appeared relatively recently, about 100-150 years ago, there is still debate among fans of the genre about who invented it first.

One of the common versions is the authorship of the Warsaw film critic Lech Pijanowski, as evidenced by the publication in the book by Martin Gardner. However, it is refuted by a booklet entitled “Sperrdomino oder das alte Dominospiel zu zweien und Dominosa, neue Dominospiele zur Selbstunterhaltung”, published in Germany in 1924, according to which the game was invented by O. S. Adler long before Pijanovsky - back in 1874.

Despite the fact that many associate this puzzle with Lech Pijanowski, there is a completely official document confirming that its author is Richard Osa. His pseudonym - O. S. Adler - is indicated in the German state patent No. 71539 (Deutschen Reichspatent), issued for the Dominosa puzzle in 1893. It is difficult to argue with such evidence, especially since the rules of the game have not changed at all since then, despite the repeated changes in its names.

In the booklet the game was listed under its current name - Dominosa, but in the German almanac Kürschners Jahrbuch of 1899 it was called Dominosa Omnibus. And in 1912, the publishing house Verlag der Züllchower Anstalten in Szczecin (Poland) called it Sperrdomino und Dominosa. Other game names are Solitaire Dominoes, Domino Hunt.

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How to solve Dominosa puzzle

How to solve Dominosa puzzle

The rules of the game in Dominosa are intuitive to anyone who has ever played classic dominoes. As you know, dominoes consist of two numbers separated by a straight line.

These can be combinations 0:1, 2:3, 6:6 and so on. Combinations are never repeated; a set of dominoes always consists of completely unique dominoes that have no repetitions. The main gaming rule of Dominosa is based on this!

Game rules

The absence of repeated paired combinations is the basis on which all other rules of the game are built. It is played on fields of different sizes, most often rectangular and square, although more exotic figures are also found. The most common form of the playing field is a 7x8 rectangle, which perfectly fits the dominoes of a standard set of dominoes. But if in dominoes the boundaries of the figures and the separators between numbers are clearly marked, then in Dominosa they are absent.

The player’s task is to circle the conditional dominoes placed on the playing field close to each other, without designated boundaries. Accordingly, it is possible to form figures in 1×2 and 2×1 formats on the field, without allowing single cells to remain blocked. The result should be a set of dominoes in which pairs of numbers are not repeated.

How to solve the puzzle

The main thing in the Dominosa game is attentiveness and the ability to quickly go through possible moves in your mind. Like other puzzles, Dominosa is based on logic, and the difficulty of the game directly depends on the size of the playing field. To quickly succeed in this game, follow these simple tips:

  • Start tracing the dominoes along the edges of the playing field, and only then move towards the center.
  • Do not block individual (single) cells between circled paired dominoes.
  • Look for doubles on the field - pairs of identical numbers: 1:1, 3:3, 5:5 and so on. In a set of dominoes there is a double for each number, and if such a pair appears on the field only once, then this is the desired double domino.

Do not rush to immediately circle pairs of numbers, first go through all the possible options in your mind. By moving from the edges to the center and gradually finding duplicates, you will quickly eliminate the bulk of the false moves, and you will be able to assemble a complete and unique set of dominoes in a short time!