Copyright (c) 1999 Mathieu Rivier, Dujardin Publ.

This game is played on a 8x8 square board with the following setup:

ORBITING - Stones (or planets) may move in orbits around another (orthogonal) adjacent stone (the gravity center) of either color. This means that the moving stone can move to an empty cell which is orthogonally adjacent to the gravity center.
This implies that isolated stones cannot move.
Orbits are multiple, after one orbit, the moving stone can continue to move, if the direction of the orbit is smooth (e.g., if it began clockwise, it must continue counterclockwise, and so on..., see first diagram)
GRAVITY PUSHES - Another moving possibility is that if there is a 3rd planet in front of a possible orbit, the orbiting stone can move to its place and push that stone to the immediate next empty cell (in the same direction of the orbit).
If that next immediate cell is not empty, the gravity push is not possible.
GOAL - The first player that moves all of his stones into the initial adversary setup wins.
An orbiting example

The marked stone can make several orbits. Two possible ones are [1] to [2], or [1] to [3] to [4].

In the second orbit, the stone could not move [1] to [3] to [a], since the orbit to [1] was clockwise, then to [3] was counterclockwise, and the orbit curve to go to [a] (now clockwise again) would bump into the upper violet stone.

A gravity push

In the same example, the marked stone could move [1] to [2] and then moving clockwise would encounter the upper violet stone, pushing it to the marked red dot.

If the red dot cell was occupied by any cell, this move was not possible!

Attraction uses the same concept of Halma and Chinese Checkers.