The Diagram does not support rules like "you can only do this once (or N times) per game" or "only after so many moves". Sometimes you can reformulate such rules as something a piece can do only once (if there only is a single piece of that type), and this can be achieved by having the piece type that can do it promote to one that cannot when 'it' is done.
The Diagram does not support rules like "you can only do this once (or N times) per game" or "only after so many moves". Sometimes you can reformulate such rules as something a piece can do only once (if there only is a single piece of that type), and this can be achieved by having the piece type that can do it promote to one that cannot when 'it' is done.