Arbos

A board game loosely similar with Go




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Components

Definitions

Setup

Turn

Scoring

Various


In Latin, "arbos" means "tree".



Components

The board (of the game) is a rectangle formed from 20 * 20 cells. On the sides of the board, on the vertical, each row is labeled from A to T. On the sides of the board, on the horizontal, each column is labeled from 1 to 20.

There are 80 white, 80 black, and 20 green discs.



Definitions

Cell = a square of the board. Each cell is identified by its coordinates, which are represented by the labels of the row and of the column put next to each other.

Disc = a white, black or green disc.

Bead = a white or black disc.

Seed = a green disc.

Neighbor cells = cells which have a common side or corner.

Free cell = a cell with no disc on it.

Occupied cell = a cell with a disc on it.

Neighbor discs = discs which are on neighbor cells.

Linked bead = a bead which is neighbor with another bead of the same color.

Linked seed = a seed which is neighbor with a bead.

Tree = a group of beads (even a single one), of the same color, which are linked among them on the board. A seed is a part of a tree (of either player, or for both of them) if it's linked to at least one of the beads of the tree.



Neighbor discs

"O" = disc, "S" = disc neighbor on a side, "C" = disc neighbor on a corner.

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| C | S | C |
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| S | O | S |
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| C | S | C |
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Setup

The number of players is two.

At the beginning of a game, the board is empty.

Then, all seeds are randomly put on the board. Each player sequentially puts a seed on the board, without thinking where to put it, as quickly (maximum 2 seconds for each one) and as spread as possible. A seed may be put on the board only if between it and any other seed from the board there are at least 2 empty cells either on the vertical or horizontal axis.

Each player receives all white or black beads, either according to their preference, or as is randomly determined. The name of each player is the same as the color of his beads: white or black.

The game ends when neither player can put a disc on the board, or when both players say "pass" one after another.



Turn

Each player has his turn, sequentially, when he has to put one of his beads on the board, on a free cell. The free cell must not be neighbor on a side with a bead of the other player.

Each player may have maximum 3 trees at any given time. If a player sees that the other player has more than 3 trees, the other player must remove from the board his / her beads until he / she has 3 trees.

From the moment his turn begins, each player has a maximum time limit (for example, 5 minutes) to put a bead on the board. If he doesn't put a bead within this time limit, it is considered that he says "pass".

Any player may say "pass", that is, he doesn't put a bead on the board. In this case, the other player has his turn.

The white player has to put the first seed and the first bead on the board.

After a disc is put on the board, it may not be moved or removed from the board.



Scoring

The game is won by the player who has the highest number of seeds linked to (any) 2 of his trees. If both players have the same number, the black player wins the game.



Various

If a player doesn't follow the rules of the game, he is declared defeated and the game ends.







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