H. G. Muller wrote on Wed, Feb 12, 2020 01:29 PM EST:
No, it would not. Betza atoms never describe null moves (unless one would have defined an atom especially for that), and even if the number of steps is variable, such as in B or R, it must at least make one step and cannot stay in place. The use of the 'a' modifier to define multiple legs doesn't alter that: each leg must at least take 1 step (and if it is a leaper leg, that would be the only step). All the moves you specified are bent two-leg moves, (they have 'fs' after the 'a'), and a Rook move isn't.
BTW, I would use gafscF instead of pafscB1; 'g' describes a range-toggle after hop, as in the Grasshopper (slide -> leap) or Contra-Grasshopper (leap -> slide). What you wrote should also work, but is a bit more cryptic. gafscF means an F step to the mount, followed by a Rook slide that can only capture.
No, it would not. Betza atoms never describe null moves (unless one would have defined an atom especially for that), and even if the number of steps is variable, such as in B or R, it must at least make one step and cannot stay in place. The use of the 'a' modifier to define multiple legs doesn't alter that: each leg must at least take 1 step (and if it is a leaper leg, that would be the only step). All the moves you specified are bent two-leg moves, (they have 'fs' after the 'a'), and a Rook move isn't.
BTW, I would use gafscF instead of pafscB1; 'g' describes a range-toggle after hop, as in the Grasshopper (slide -> leap) or Contra-Grasshopper (leap -> slide). What you wrote should also work, but is a bit more cryptic. gafscF means an F step to the mount, followed by a Rook slide that can only capture.