Copyright (c) 1978 Gabriel Publishing

This game is played on an empty 5x5 square board:

TURNS - At each turn, each player drops a stone on an empty cell provided that it is not orthogonally adjacent to an enemy stone.
The first stone cannot be dropped on the center cell.
If a player is unable to move, he must pass.
GOAL - When no more drops are possible, the player with the most stones on the board scores one point for each extra stone. Continue to play rounds, (alternating first move) until one player's cumulative score reaches seven and wins.

An example

Black's move. He drops a stone at cell [1]. White then only is able to drop at e5. Then Black wins this round by dropping stones at a3 and c1.

There is a ZRF to play British Square with Zillions.