Initially the board is filled with black and white stones arranged in the checkerboard pattern.
Players move alternately, starting with the player with the black stones.
On each turn, a player can do either a capturing or a non-capturing move (but not both the same time):
- The capturing move is made by moving a player stone to an orthogonally adjacent cell occupied with the enemy stone. The enemy stone is removed from the board.
- The non-capturing move is made by moving a player's stone to an empty cell reachable by one or more orthogonal slides (i.e. there should be a clear path of orthogonally adjacent empty spaces between the source and the target cell).
After making one of the mentioned above moves, the player removes all stones (both black and white) that aren't connected to the moved player's stone with some chain of adjacent (either horizontally or vertically) stones (both black and white) - same way as it is done in the "standard rules".
The non-capturing move (the 2nd option) must produce the removal of at least one stone to be legal (so, every move in Forms produces at least one capture/removal).
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