Hoppers cannot hop over holes, which are treated as off-board squares. But you could define, say, [oR-fmR] to get a piece that can hop over a hole. Iron pieces are pieces, so hoppers can hop over them. Unless the captureMatrix would forbid it.
So, it seems that adding captureMatrix=^ would make it equal. (or would captureMatrix=$ be better?)
There is currently no restriction possible on U. Conceivable would be a range, or directional modifiers that would be interpreted according to the K or oblique system, depending on the destination.
I've actually been hoping for a range limiter for U, as a trailing number, the way such a number would limit B, R, or Q.
I can understand, though, if there's no way to use modifiers on U to represent a true Equihopper. (I tried paifU a while back, but of course it didn't work.)
So, it seems that adding captureMatrix=^ would make it equal. (or would captureMatrix=$ be better?)
I've actually been hoping for a range limiter for U, as a trailing number, the way such a number would limit B, R, or Q.
I can understand, though, if there's no way to use modifiers on U to represent a true Equihopper. (I tried paifU a while back, but of course it didn't work.)