Well, I am not sure that it would be helpful (or even possible) to express each an every rule of a game as moves of the pieces. 'Exciting with a null move' is not the same as freezing; 'exciting' in its usual context means that a piece gets the specified move in addition to its own moves. So logically, exciting with a null move would mean the targeted piece (and thus the player handling it) is now also allowed to pass his turn.
The point is that freezing is not directly associated with any movement of the piece that causes it. It is an influence exerted by the piece due to its presence alone, which doesn't take a turn. (What the Interactive Diagram calls a 'spell'.) There are other spells, such as only robbing neigboring pieces of their capture moves, and there are also 'persistent spells' the effect of which would even last after the source moves away ('burning' being the simplest example of that). If all that should be expressed in the move notation we would need a large number of additional modifiers.
I agree that there is a spatial effect to the spells, which conveniently can be expressed in Betza notation. But I think it is more logical to keep moving separate from other effects, and describe a piece like the Ultima Immobilizer like "moves as Q, freezes as K". The Interactive Diagram already supports something like that in an ad-hoc way, by allowing you to choose one particular spell and define its spellZone as W, F, K or N. In practice it is quite rare that different kinds of spells are needed in the same variant. But perhaps a future version will implement this as well.
Well, I am not sure that it would be helpful (or even possible) to express each an every rule of a game as moves of the pieces. 'Exciting with a null move' is not the same as freezing; 'exciting' in its usual context means that a piece gets the specified move in addition to its own moves. So logically, exciting with a null move would mean the targeted piece (and thus the player handling it) is now also allowed to pass his turn.
The point is that freezing is not directly associated with any movement of the piece that causes it. It is an influence exerted by the piece due to its presence alone, which doesn't take a turn. (What the Interactive Diagram calls a 'spell'.) There are other spells, such as only robbing neigboring pieces of their capture moves, and there are also 'persistent spells' the effect of which would even last after the source moves away ('burning' being the simplest example of that). If all that should be expressed in the move notation we would need a large number of additional modifiers.
I agree that there is a spatial effect to the spells, which conveniently can be expressed in Betza notation. But I think it is more logical to keep moving separate from other effects, and describe a piece like the Ultima Immobilizer like "moves as Q, freezes as K". The Interactive Diagram already supports something like that in an ad-hoc way, by allowing you to choose one particular spell and define its spellZone as W, F, K or N. In practice it is quite rare that different kinds of spells are needed in the same variant. But perhaps a future version will implement this as well.