Tennis is an (abstract) strategic paper-and-pencil game for two players.
At start, the ball is at the centre line (0).
Both players start with the same initial number (e.g. 50 points).
The number chosen reduces the points for the next draws.
The aim of the game is to move the ball beyond the second field of the opponent.
The game is described in Das große Buch der Block- und Bleistiftspiele.
[1] For a simple description, we include the numbers -3 and 3 to denote the ball being beyond the second field.
The draw of player i at time t will be denoted as
The ball is moved as follows: For the result of the game, the following rules apply: In the first example, player one wins, but the ball is still on the playfield when both players do not have any points left.
In the second example, player 1 wins again, by hitting the ball beyond the other playfield using the last points he has left.