SR1
For the game, additional rules can also be used. Here are a few of them.
SR2
Stones can have different strengths, and a specific total is required for removal.
SR3
Stones with non-contact removal cannot remove stones in a contact manner; they must maintain a distance.
SR4
Non-contact removal applies only to certain squares. For example, the range is five squares, and beyond that, they no longer have strength.
SR5
Strength may vary with distance.
SR6
To remove a stone, it must be in contact with another of its own stones that is not in contact with the stone being removed. It will only provide support.