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I don't know. But I got my ass kicked by Zillions several times. But I
don't know any DVONN tactics, so probably it is just a sign that I'm
still not good at it.

My ZRF is built with the idea that the only things that matter for a stack
are its size, its owner and whether or not a DVONN-piece is in there. I
didn't bother about stacks larger than 25 (because they and larger stacks
are equally immobile and equally winning when surviving). Rules like the
'No move with enclosed pieces' are trivial to implement. After each
move, an administrator (?-player) must remove all disconnected pieces.

I used a pass-detector that detects when players pass. Then I create dummy
pieces to make high stacks count for that many pieces and then carefully
trigger the count-condition.

But I think that the maximum height of a stack is more than 25. Take the
leftmost positions as building position. Then try to get stacks with
heights 1, 2, 3, 4, etc. on positions on the center row. From four other
positions, stacks can directly be moved to the target. Still, I don't
think the answer is 49 (or 46 for a DVONN-less stack), but probably they
are close.