this modification are used by PDE Football. In some variants, gameplay can be continued from the central pitch's point after a goal is scored or after a play is blocked. The player who did not score moves first from the central point. The game is finished when a move from the central point is not possible, and the player who scored the most goals wins. Another variant allows a player to make a "bounce" during any turn if the line of that bounce would cross an existing diagonal line. Another variant is Texas Soccer which allows no "X" marks to be made as the ball can no longer cross through a diagonal line. Strategy Since the ball's movement cannot overlap previously drawn lines, a player can block their opponent's potential moves by filling strategic points on the board and limiting the mobility of their opponent. Another strategy is based on the use of "bounces" for streamlining mobility, which can greatly aid in scoring goals or blocking access to the player's own goal area. In versions of the game where a player who cannot move loses, a player can focus on moving the ball to a position where their opponent cannot move it further. In some early computerized versions of this game, the AI player tends to choose the shortest path to the player's goal, ignoring bounces and other strategies. That strategy is not universal. Computer version of Paper Soccer include graphs and pathfinding (just as other games like Quoridor). Computer programs still do not play this game at competitive/top level. Game notation Each move in the game may be recorded as a string of one or more digits from 0 to 7, each digit representing the direction of a move (with 0 corresponding to 'north', 1 to 'north-east', 2 to 'east' and so on) across a single grid. Multiple digits are used to record bounce moves. This notation has been used in a PlayOK.com service. Similar games There are two similar games that imitate paper soccer. Their mechanisms also depend on drawing lines to describe a ball's movement on a field. Paper soccer (Russian variant) This paper-and-pencil game also involves drawing lines to adjacent points on a grid and is distinguished by a larger play area and players extending the line to three points each turn. The line can change direction at each point but must not touch any existing