It never occurred to me to use the Universal Leaper move for mimicking drops. An alternative over defining it as an initial move would be to define a captureMatrix that has the Pocket Knight promote to Knight whenever it moves (captureMatrix=/////N). The Pocket Knight can then be simply mU, and you would not need so many inaccessible ranks to isolate it from the board.
Clever solution to the drop problem!
It never occurred to me to use the Universal Leaper move for mimicking drops. An alternative over defining it as an initial move would be to define a captureMatrix that has the Pocket Knight promote to Knight whenever it moves (captureMatrix=/////N). The Pocket Knight can then be simply mU, and you would not need so many inaccessible ranks to isolate it from the board.