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|Tanbo is a two-player abstract board game played on a Go board that was invented by Mark Steere in 1993. This game is a member of the territory game family including such games as Go.|
Tanbo is played on a Go board (19x19). There are two players using black and white stones.
The initial position of the stones is shown in the following illustration:
|Object of the Game|
During the game stones are added to and removed from the board.
The goal of Tanbo is to stay with at least one stone when all opponent's stones have been removed from the board.
No draws are possible in Tanbo.
Each player has an allocated color: Black or White.
Starting with Black, players take turns placing a stone of their color on any empty intersection of the board that is horizontally or vertically adjacent to exactly one like-colored stone. A player cannot place a stone on an intersection that is not adjacent to any of his stones or that is adjacent to two or more of his stones.
Below are some examples of possible moves for Black and White:
Tanbo is a game of "roots" - groups of connected stones of the same color. Players start the game with eight single-stone roots each. When placing a stone as described above, you are expanding one of your roots by connecting your stone to it. The basic move rule (your newly added stone must connect to exactly one of your other on-board stones) prevents the formation of clumps and closed loops in roots as well as the merger of like-colored roots.
|Removal of stones|
The "current root" is the root a player connects a stone to on his turn.
A root is called "bounded" if it cannot be expanded, i.e. if no stone of the same color could be connected to it without violation of the rules.
If a player adds a stone and as a result the "current root" becomes "bounded" then all stones composing it (including the newely added stone) are removed from the board:
If the newely added stone doesn't cause the "current root" to become "bounded" but it bounds other roots (of either or both colors) then all stones composing those roots are removed from the board:
If the newly added stone causes both the "current root" and other roots to become "bounded", then only the "current root" is removed from the board. After removing the "current root", the other roots which were temporarily "bounded" are no longer "bounded":