Yes, it does. Doesn't the withdrawer in Ultima move as a queen, so wouldn't need to detect the board edge? Detecting the edge is still very useful. The suggested uses of E and cc make sense to me.
I don't quite understand how dau and cau work now. I tried (dauf)Q, thinking that would describe a queen that could pass through friendly pieces, but if it captures after unloading the captured piece ends up at the starting square of the whole move. Is that intended?
Yes, it does. Doesn't the withdrawer in Ultima move as a queen, so wouldn't need to detect the board edge? Detecting the edge is still very useful. The suggested uses of E and cc make sense to me.
I don't quite understand how dau and cau work now. I tried (dauf)Q, thinking that would describe a queen that could pass through friendly pieces, but if it captures after unloading the captured piece ends up at the starting square of the whole move. Is that intended?