In the huge 5x(12x12) variant that I mentioned, the Sea, Waves and Air are levels 1, 3, and 5. The new levels are Caves at 2, and Land at 4. They're not parallel to the odd-numbered levels, though; they're split down the middle between Left and Right, with their inner edges in line with the other boards' right edges. And when a piece can move from one of the outer boards to one of the inner or vice versa, it does so as if there was no barrier.
If I ever truly build that one, never mind IG or the Java Applet; I might try to make a Zillions file for it, though.
Even so, if I were to try to make a Betza code for something like Aquachess, I'd make it as an "eligibility" marker on the Pieces (something like the type-sensitivity idea already proposed on the Betza page). Those restricted to one level just wouldn't have vertical moves; those with vertical moves that can only go to two levels (which is everyone but the Dragon) would have a restriction marker against Air or Sea.
(And I think you can probably see now why I said I wouldn't even try with it!)
I do notice that XBetza doesn't use a lot of punctuation marks; perhaps something like +, &, %, or ^ could be utilized to indicate a level change. If that sounds like a possibility, I'll make a fuller proposal on the Betza page.
I can make that worse for you:
In the huge 5x(12x12) variant that I mentioned, the Sea, Waves and Air are levels 1, 3, and 5. The new levels are Caves at 2, and Land at 4. They're not parallel to the odd-numbered levels, though; they're split down the middle between Left and Right, with their inner edges in line with the other boards' right edges. And when a piece can move from one of the outer boards to one of the inner or vice versa, it does so as if there was no barrier.
If I ever truly build that one, never mind IG or the Java Applet; I might try to make a Zillions file for it, though.
Even so, if I were to try to make a Betza code for something like Aquachess, I'd make it as an "eligibility" marker on the Pieces (something like the type-sensitivity idea already proposed on the Betza page). Those restricted to one level just wouldn't have vertical moves; those with vertical moves that can only go to two levels (which is everyone but the Dragon) would have a restriction marker against Air or Sea.
(And I think you can probably see now why I said I wouldn't even try with it!)
I do notice that XBetza doesn't use a lot of punctuation marks; perhaps something like +, &, %, or ^ could be utilized to indicate a level change. If that sounds like a possibility, I'll make a fuller proposal on the Betza page.