I'm hoping to make a Zillions implementation of Star Trek Tridimensional Chess. That game features movable 2x2 attack platforms that the current owner can place to best advantage (but only if occupied by a pawn or less). I was curious whether or not it was actually possible to implement a mobile platform in Zillions, so I made a 2D variant using them. The game turned out to be rather interesting in its own right.
The board is an 8x8 checkered square, hereafter referred to as the Void. No pieces may ever stand on the Void. Rooks, Queens, and Bishops may not cross the void. Instead, pieces are required to stand on and move over any of twelve 2x2 platforms that roam the Void.
Each player starts the game with control of six platforms, four of them full. Ownership of these platforms will not change through the course of the game.
During your turn, you may take one of two actions:
The Chess pieces are set up as in Chess. Each player controls four platforms that hold his initial army, and two empty ones forward and to the side. The 4x4 central region begins devoid of platforms.
In 8-Platform Chess, the empty platforms in the starting setup are omitted. Each player starts with just enough platforms to hold his army.
The aforementioned Zillions implementation is available here. Zillions v1.3.1p or later is required!
A sample game with running commentary by the author can be found below: